A. Pompili

We study initial-state radiation events, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\gamma}}_{\mathrm{ISR}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$, with data collected with the BABAR detector. We observe an accumulation of events near $4.26\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ in the invariant-mass spectrum of ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$. Fits to the mass spectrum indicate that a broad resonance with a mass of about $4.26\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to $90\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, depending on the fit hypothesis.

We have observed a narrow state near 2.32 GeV/c2 in the inclusive D+sπ0 invariant mass distribution from e+e− annihilation data at energies near 10.6 GeV. The observed width is consistent with the experimental resolution. The small intrinsic width and the quantum numbers of the final state indicate that the decay violates isospin conservation. The state has natural spin-parity and the low mass suggests a JP=0+ assignment. The data sample corresponds to an integrated luminosity of 91 fb−1 recorded by the BABAR detector at the SLAC PEP-II asymmetric-energy e+e− storage ring.Received 11 April 2003DOI:https://doi.org/10.1103/PhysRevLett.90.242001©2003 American Physical Society

We study the decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using $117\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at the $Y(4S)$ resonance with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring. We measure the branching fractions $\mathcal{B}$ $({B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(116\ifmmode\pm\else\textpm\fi{}7(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}9(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}$ $({B}^{\ensuremath{-}}\ensuremath{\rightarrow}X(3872){\mathrm{K}}^{\ensuremath{-}})\ifmmode\times\else\texttimes\fi{}$ $\mathcal{B}$ $(X(3872)\ensuremath{\rightarrow}\mathrm{J}/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(1.28\ifmmode\pm\else\textpm\fi{}0.41)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and find the mass of the $X(3872)$ to be $3873.4\ifmmode\pm\else\textpm\fi{}1.4\text{ }\text{ }\mathrm{MeV}/{\mathrm{c}}^{2}$. We search for the ${h}_{c}$ narrow state in the decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{c}{K}^{\ensuremath{-}}$, ${h}_{c}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and for the decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$, with ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. We set the $90%$ C.L. limits $\mathcal{B}({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{c}{K}^{\ensuremath{-}})\ifmmode\times\else\texttimes\fi{}\mathcal{B}({h}_{c}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})<3.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}({B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{0}{\ensuremath{\pi}}^{\ensuremath{-}})<5.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.

Abstract This paper reports world averages of measurements of b -hadron, c -hadron, and $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -lepton properties obtained by the Heavy Flavour Averaging Group using results available through September 2018. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, $$C\!P$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>C</mml:mi> <mml:mspace /> <mml:mi>P</mml:mi> </mml:mrow> </mml:math> violation parameters, parameters of semileptonic decays, and Cabibbo–Kobayashi–Maskawa matrix elements.

This paper reports world averages of measurements of b-hadron, c-hadron, and τ-lepton properties obtained by the Heavy Flavor Averaging Group using results available before April 2021. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements.97 MoreReceived 25 June 2022Accepted 20 September 2022DOI:https://doi.org/10.1103/PhysRevD.107.052008Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBound statesCabibbo–Kobayashi–Maskawa matrixChiral perturbation theoryElectroweak interactionFlavor changing neutral currentsForm factorsHadron mixingLattice QCDParticle decaysParticle interactionsParticle mixing & oscillationsQuark mixingParticles & Fields

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

The e+e- -> p anti-p cross section is determined over a range of p anti-p masses, from threshold to 4.5 GeV/c^2, by studying the e+e- -> p anti-p gamma process. The data set corresponds to an integrated luminosity of 232 fb^-1, collected with the BABAR detector at the PEP-II storage ring, at an e+e- center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |G_E/G_M|, is measured for p anti-p masses below 3 GeV/c^2; its value is found to be significantly larger than 1 for masses up to 2.2 GeV/c^2. We also measure J/psi -> p anti-p and psi(2S) -> p anti-p branching fractions and set an upper limit on Y(4260) -> p anti-p production and decay.

The BaBar detector operated successfully at the PEP-II asymmetric e+e− collider at the SLAC National Accelerator Laboratory from 1999 to 2008. This report covers upgrades, operation, and performance of the collider and the detector systems, as well as the trigger, online and offline computing, and aspects of event reconstruction since the beginning of data taking.

We measure the branching fraction for the flavor-changing neutral-current process B-->X(s)l(+)l(-) with a sample of 89x10(6) Upsilon(4S)-->BBmacr; events recorded with the BABAR detector at the PEP-II e(+)e(-) storage ring. The final state is reconstructed from e(+)e(-) or micro(+)micro(-) pairs and a hadronic system X(s) consisting of one K+/- or K(0)(S) and up to two pions, with at most one pi(0). We observe a signal of 40+/-10(stat)+/-2(syst) events and extract the inclusive branching fraction B(B-->X(s)l(+)l(-))=(5.6+/-1.5(stat)+/-0.6(exp syst)+/-1.1(model syst))x10(-6) for ml(+)(l(-))>0.2 GeV/c(2).

We present a measurement of the direct CP violating asymmetry in the decay B0-->K+pi(-) using a data sample of 227x10(6) Upsilon(4S)-->BB decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We observe a total signal yield of nK-(pi(+))+nK+(pi(-))=1606+/-51 decays and measure the asymmetry (nK-(pi(+))-nK+(pi(-)))/(nK-(pi(+))+nK+(pi(-)))=-0.133+/-0.030(stat)+/-0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3x10(-5), corresponding to 4.2 standard deviations.

We study e+e−→J/ψ cc¯ by measuring the invariant mass distribution recoiling against fully reconstructed J/ψ decays, using 124 fb−1 of data collected at a center-of-mass energy of 10.6 GeV with the BABAR detector. We observe signals for ηc(1S), χc0, and ηc(2S) in the recoil mass distribution, thus confirming previous measurements. We measure σ(e+e−→J/ψ+cc¯)B(cc¯→>2 charged) to be 17.6±2.8(stat)−2.1+1.5(syst) fb, 10.3±2.5(stat)−1.8+1.4(syst) fb, and 16.4±3.7(stat)−3.0+2.4(syst) fb with cc¯=ηc(1S), χc0, and ηc(2S), respectively.Received 25 June 2005DOI:https://doi.org/10.1103/PhysRevD.72.031101©2005 American Physical Society

The process e+e- --&gt; pi+ pi- pi0 gamma has been studied at a center-of-mass energy near the Y(4S) resonance using a 89.3 fb-1 data sample collected with the BaBar detector at the PEP-II collider. From the measured 3pi mass spectrum we have obtained the products of branching fractions for the omega and phi mesons, B(omega --&gt; e+e-)B(omega --&gt; 3pi)=(6.70 +/- 0.06 +/- 0.27)10-5 and B(phi --&gt; e+e-)B(phi --&gt; 3pi)=(4.30 +/- 0.08 +/- 0.21)10-5, and evaluated the e+e- --&gt; pi+ pi- pi0 cross section for the e+e- center-of-mass energy range 1.05 to 3.00 GeV. About 900 e+e- --&gt; J/psi gamma --&gt; pi+ pi- pi0 gamma events have been selected and the branching fraction B(J/psi --&gt; pi+ pi- pi0)=(2.18 +/- 0.19)% has been measured.

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ recorded at the $\ensuremath{\Upsilon}(4S)$ resonance and 3.9 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ off resonance. One of the neutral B mesons, which are produced in pairs at the $\ensuremath{\Upsilon}(4S),$ is fully reconstructed in the CP decay modes $J/\ensuremath{\psi}{K}_{S}^{0},$ $\ensuremath{\psi}{(2S)K}_{S}^{0},$ ${\ensuremath{\chi}}_{c1}{K}_{S}^{0},$ $J/\ensuremath{\psi}{K}^{*0}$ ${(K}^{*0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0})$ and $J/\ensuremath{\psi}{K}_{L}^{0},$ or in flavor-eigenstate modes involving ${D}^{(*)}\ensuremath{\pi}/\ensuremath{\rho}{/a}_{1}$ and $J/\ensuremath{\psi}{K}^{*0}$ ${(K}^{*0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}).$ The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the ${B}^{0}\ensuremath{-}{B}^{0}$ oscillation frequency $\ensuremath{\Delta}{m}_{d}$ are measured with a sample of about 6350 fully-reconstructed ${B}^{0}$ decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds $\ensuremath{\Delta}{m}_{d}=0.516\ifmmode\pm\else\textpm\fi{}0.016(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.010(\mathrm{syst}){\mathrm{ps}}^{\ensuremath{-}1}.$ The value of the asymmetry amplitude $\mathrm{sin}2\ensuremath{\beta}$ is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged ${B}^{0}$ decays in the CP-eigenstate modes. We find $\mathrm{sin}2\ensuremath{\beta}=0.59\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst}),$ demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter $|\ensuremath{\lambda}|=0.93\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{syst}),$ which is consistent with the expectation of $|\ensuremath{\lambda}|=1$ for no direct CP violation.

With a sample of approximately 89 x 10(6) B(-)B pairs collected with the BABAR detector, we perform a search for B meson decays into pairs of charmless vector mesons (phi, rho, and K*). We measure the branching fractions, determine the degree of longitudinal polarization, and search for CP violation asymmetries in the processes B+-->phiK(*+), B0-->phiK(*0), B+-->rho(0)K(*+), and B+-->rho(0)rho(+). We also set an upper limit on the branching fraction for the decay B0-->rho(0)rho(0).

A search for the nonconservation of lepton flavor number in the decay τ±→μ±γ has been performed using 2.07×108 e+e−→τ+τ− events produced at a center-of-mass energy near 10.58 GeV with the BABAR detector at the PEP-II storage ring. We find no evidence for a signal and set an upper limit on the branching ratio of B(τ±→μ±γ)<6.8×10−8 at 90% confidence level.Received 16 February 2005DOI:https://doi.org/10.1103/PhysRevLett.95.041802©2005 American Physical Society

We present measurements of branching fractions and CP-violating asymmetries for two-body neutral B meson decays to charged pions and kaons based on a sample of about 88x10(6) Upsilon(4S)-->BB decays. From a time-independent fit we measure the charge-averaged branching fractions B(B0-->pi+pi-)=(4.7+/-0.6+/-0.2)x10(-6), B(B0-->K+pi-)=(17.9+/-0.9+/-0.7)x10(-6), and the direct CP-violating charge asymmetry A(Kpi)=-0.102+/-0.050+/-0.016 [-0.188,-0.016], where the ranges in square brackets indicate the 90% confidence intervals. From a time-dependent fit we measure the B0-->pi+pi- CP-violating parameters S(pipi)=0.02+/-0.34+/-0.05 [-0.54,+0.58] and C(pipi)=-0.30+/-0.25+/-0.04 [-0.72,+0.12].

We study the process $e^+e^-\to\pi^+\pi^-\pi^+\pi^-\gamma$, with a hard photon radiated from the initial state. About 60,000 fully reconstructed events have been selected from 89 $fb^{-1}$ of BaBar data. The invariant mass of the hadronic final state defines the effective \epem center-of-mass energy, so that these data can be compared with the corresponding direct $e^+e^-$ measurements. From the $4\pi$-mass spectrum, the cross section for the process $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ is measured for center-of-mass energies from 0.6 to 4.5 $GeV/c^2$. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states $K^+ K^- \pi^+\pi^-$ and $K^+ K^- K^+ K^-$. We observe the $J/\psi$ in all three final states and measure the corresponding branching fractions. We search for X(3872) in $J/\psi (\to\mu^+\mu^-) \pi^+\pi^-$ and obtain an upper limit on the product of the $e^+e^-$ width of the X(3872) and the branching fraction for $X(3872) \to J/\psi\pi^+\pi^-$.

A search for the nonconservation of lepton flavor in the decay τ±→e±γ has been performed with 2.07×108 e+e−→τ+τ− events collected by the BABAR detector at the SLAC PEP II storage ring at a center-of-mass energy near 10.58 GeV. We find no evidence for a signal and set an upper limit on the branching ratio of B(τ±→e±γ)<1.1×10−7 at 90% confidence level.Received 5 August 2005DOI:https://doi.org/10.1103/PhysRevLett.96.041801©2006 American Physical Society

We report a Dalitz-plot analysis of the charmless hadronic decays of charged B mesons to the final state K±π∓π±. Using a sample of 226.0±2.5 million B¯¯¯B pairs collected by the BABAR detector, we measure the magnitudes and phases of the intermediate resonant and nonresonant amplitudes for both charge-conjugate decays. We present measurements of the corresponding branching fractions and their charge asymmetries that supersede those of previous BABAR analyses. We find the charge asymmetries to be consistent with zero.Received 1 July 2005DOI:https://doi.org/10.1103/PhysRevD.72.072003©2005 American Physical Society

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 x 10(6) upsilon(4S) --> BB decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CPasymmetry, sin2beta in the standard model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0 from its decay products. We measure sin2beta = 0.722 +/- 0.040(stat) +/- 0.023(syst) in agreement with the standard model expectation.

A narrow state, which we label DsJ(2458)+, with a mass 2458.0±1.0(stat)±1.0(syst)MeV/c2, is observed in the inclusive D+sπ0γ mass distribution in 91fb−1 of e+e− annihilation data recorded by the BABAR detector at the SLAC PEP-II asymmetric-energy e+e− storage ring. The observed width is consistent with the experimental resolution. The data favor decay through D*s(2112)+π0 rather than through D*sJ(2317)+γ. An analysis of D+sπ0 data accounting for the influence of the DsJ(2458)+ produces a D*sJ(2317)+ mass of 2317.3±0.4(stat)±0.8(syst)MeV/c2. Received 24 October 2003DOI:https://doi.org/10.1103/PhysRevD.69.031101©2004 American Physical Society

We present results of a search for the X(3872) in B0→X(3872)K0S,X(3872)→J/ψπ+π−, improved measurements of B−→X(3872)K−, and a study of the J/ψπ+π− mass region above the X(3872). We use 232×106 B¯¯¯B pairs collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e− asymmetric-energy storage rings. The results include the 90% confidence interval 1.34×10−6<B(B0→X(3872)K0,X→J/ψπ+π−)<10.3×10−6 and the branching fraction B(B−→X(3872)K−,X→J/ψπ+π−)=(10.1±2.5±1.0)×10−6. We observe a (2.7±1.3±0.2)MeV/c2 mass difference of the X(3872) produced in the two decay modes. Furthermore, we search for the Y(4260) in B decays and set the 95% C.L. upper limit B(B−→Y(4260)K−,Y(4260)→J/ψπ+π−)<2.9×10−5.Received 21 July 2005DOI:https://doi.org/10.1103/PhysRevD.73.011101©2006 American Physical Society

We search for a charged partner of the X(3872) in the decay B --&gt; X- K, X- --&gt; J/psi pi- pi0, using 234 million BBbar events collected at the Y(4S) resonance with the BaBar detector at the PEP-II e+e- asymmetric-energy storage ring. The resulting product branching fraction upper limits are BR(B0 --&gt; X- K+, X- --&gt; J/psi pi- pi0) &lt; 5.4 x 10(-6) and BR(B- --&gt; X- K0bar,X- --&gt; J/psi pi- pi0) &lt; 22 x 10(-6) at the 90% confidence level.

The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c)-->K(0)(S)K+/-pi(-/+) decays in 88 fb(-1) of data, the results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) and Gamma(eta(c))(tot)=34.3+/-2.3(stat)+/-0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112+/-24 events is observed with a mass of 3630.8+/-3.4(stat)+/-1.0(syst) MeV/c(2) and width of 17.0+/-8.3(stat)+/-2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.

We present results on $B\to J/ψ\xspace Kπ$ decays using $e^+e^-$ annihilation data collected with the BABAR detector at the $Υ(4S)$ resonance. The detector is located at the PEP-II asymmetric-energy storage ring facility at the Stanford Linear Accelerator Center. Using approximately 88 million $B\bar{B}$ pairs, we measure the decay amplitudes for the flavor eigenmodes and observe strong-phase differences indicative of final-state interactions with a significance of 7.6 standard deviations. We use the interference between the $Kπ$ $S$-wave and $P$-wave amplitudes in the region of the $K^*(892)$ to resolve the ambiguity in the determination of these strong phases. We then perform an ambiguity-free measurement of $\cos2β$ using the angular and time-dependent asymmetry in $B\to J/ψ\xspace K^{*0}(K_S^0π^0$) dec With $\sin 2 β$ fixed at its measured value and $\cos 2 β$ treated as an in we find $\cos 2β=2.72_{-0.79}^{+0.50}\mathrm{(stat)} \pm 0.27\mathrm{(syst)}$, de sign of $\cos 2β$ to be positive at 86% CL.

With a sample of 232x10^6 Upsilon(4S) --> BBbar events collected with the BaBar detector, we study the decay B+ --> p pbar K+ excluding charmonium decays to ppbar. We measure a branching fraction Br(B+ --> p pbar K+)=(6.7+/-0.5+/-0.4)x10^{-6}. An enhancement at low ppbar mass is observed and the Dalitz plot asymmetry suggests dominance of the penguin amplitude in this B decay. We search for a pentaquark candidate Theta*++ decaying into pK+ in the mass range 1.43 to 2.00 GeV/c2 and set limits on Br(B+ --> Theta*++pbar)xBr(Theta*++ --> pK+) at the 10^{-7} level.

We study the two-body decays of B^\pm mesons to K^\pm and a charmonium state, X_{c\bar c}, in a sample of 210.5 fb^{-1} of data from the BaBar experiment. We perform measurements of absolute branching fractions BR(B^\pm --> K^\pm X_{c\bar c}) using a missing mass technique, and report several new or improved results. In particular, the upper limit BR(B^\pm --> K^\pm X(3872))<3.2 10^-4 at 90% CL and the inferred lower limit BR(X(3872) --> J/\psi\pi^+\pi^-)>4.2% will help in understanding the nature of the recently discovered X(3872).

A search for the lepton-flavor-violating decay of the tau into three charged leptons has been performed using 91.5 fb−1 of data collected at an e+e−center-of-mass energy around 10.58 GeV with the BABAR detector at the SLAC storage ring PEP-II. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (1–3)×10−7 at 90% confidence level.Received 8 December 2003DOI:https://doi.org/10.1103/PhysRevLett.92.121801©2004 American Physical Society

With a sample of about 227x10(6) BB pairs recorded with the BABAR detector we perform a full angular analysis of the decay B0-->phiK(*0)(892). We make novel measurements of five parameters sensitive to CP violation. We also measure the branching fraction to be (9.2+/-0.9+/-0.5)x10(-6) and determine the fractions of longitudinal and parity-odd transverse contributions as f(L)=0.52+/-0.05+/-0.02 and f( perpendicular)=0.22+/-0.05+/-0.02. The phases of the parity-even and parity-odd transverse amplitudes relative to the longitudinal amplitude are found to be phi( parallel)=2.34(+0.23)(-0.20)+/-0.05 rad and phi( perpendicular)=2.47+/-0.25+/-0.05 rad. We also observe the decay B0-->phiK(*0)(1430).

We report on a measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase γ through a Dalitz analysis of neutral D decays to KS0π−π+ in the processes B∓→D(*)K∓, D*→Dπ0, Dγ. Using a sample of 227×106 BB¯ pairs collected by the BABAR detector, we measure the amplitude ratios rB=0.12±0.08±0.03±0.04 and rB*=0.17±0.10±0.03±0.03, the relative strong phases δB=(104±45−21−24+17+16)° and δB*=(−64±41−12+14±15)° between the amplitudes A(B−→D¯(*)0K−) and A(B−→D(*)0K−), and γ=(70±31−10−11+12+14)°. The first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the Dalitz model uncertainty. The results for the strong and weak phases have a twofold ambiguity.Received 20 April 2005DOI:https://doi.org/10.1103/PhysRevLett.95.121802©2005 American Physical Society

We report a measurement of the inclusive electron energy spectrum for semileptonic decays of B mesons in a data sample of 52 million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy B-meson factory at SLAC. We determine the branching fraction, first, second, and third moments of the spectrum for lower cutoffs on the electron energy between 0.6 and 1.5 GeV. We measure the partial branching fraction to be $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}\mathrm{Xe}\ensuremath{\nu}{,E}_{e}&gt;0.6\mathrm{GeV})=[10.36\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.23(\mathrm{sys}.)]%.$

We present evidence for the flavor-changing neutral current decay B-->K*l+l- and a measurement of the branching fraction for the related process B-->K l+l-, where l+l- is either an epsilon+epsilon- or a mu+mu- pair. These decays are highly suppressed in the standard model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises 123 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the SLAC PEP-II epsilon+epsilon- storage ring. Averaging over K(*) isospin and lepton flavor, we obtain the branching fractions B(B-->Kl+l-)=(0.65(+0.14)(-0.13)+/-0.04)x10(-6) and B(B-->K*l+l-)=(0.88(+0.33)(-0.29)+/-0.10)x10(-6), where the uncertainties are statistical and systematic, respectively. The significance of the B-->Kl+l- signal is over 8sigma, while for B-->K*l+l- it is 3.3sigma.

We determine the inclusive B→Xcℓν branching fraction, Bcℓν, the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|, and other heavy-quark parameters from a simultaneous fit to moments of the hadronic-mass and lepton-energy distributions in semileptonic B-meson decays, measured as a function of the lower limit on the lepton energy, using data recorded with the BABAR detector. Using heavy-quark expansions (HQEs) to order 1/m3b, we extract Bceν=(10.61±0.16exp±0.06HQE)% and ∣∣Vcb∣∣=(41.4±0.4exp±0.4HQE±0.6th)×10−3. The stated errors refer to the experimental, HQE, and additional theoretical uncertainties.Received 12 April 2004DOI:https://doi.org/10.1103/PhysRevLett.93.011803©2004 American Physical Society

We report the observation of the $B$ meson decay $B^\pm\to J/\psi \eta K^\pm$ and evidence for the decay $B^0\to J/\psi \eta K^0_S$, using {90} million $BBbar$ events collected at the $\ensuremath{\Upsilon{(4S)}}\xspace$ resonance with the $BaBar$ detector at the PEP-II $e^+ e^-$ asymmetric-energy storage ring. We obtain branching fractions of $\cal{B}$$(B^\pm\to J/\psi \eta K^{\pm}$)=$(10.8\pm 2.3(\rm{stat.})\pm 2.4(\rm{syst.}))\times 10^{-5}$ and $\cal{B}$$(B^0\to J/\psi\eta K_{\rm{S}}^{0}$)=$(8.4\pm 2.6(\rm{stat.})\pm 2.7(\rm{syst.}))\times 10^{-5}$. We search for the new narrow mass state, the X(3872), recently reported by the Belle Collaboration, in the decay $B^\pm\to X(3872)K^\pm, X(3872)\to \jpsi \eta$ and determine an upper limit of $\cal{B}$$(B^\pm \to X(3872) K^\pm \to \jpsi \eta K^\pm$) $<7.7\times 10^{-6}$ at 90% C.L.

The inclusive production of charmonium mesons in B meson decay has been studied in a 20.3 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ data set collected by the BABAR experiment operating at the $\ensuremath{\Upsilon}(4S)$ resonance. Branching fractions have been measured for the inclusive production of the charmonium mesons $J/\ensuremath{\psi},$ $\ensuremath{\psi}(2S),$ ${\ensuremath{\chi}}_{c1},$ and ${\ensuremath{\chi}}_{c2}.$ The branching fractions are also presented as a function of the center-of-mass momentum of the mesons and of the helicity of the $J/\ensuremath{\psi}.$

The branching fractions of the decays B0→K*0γ and B+→K*+γ are measured using a sample of 88×106BB¯ events collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider. We find B(B0→K*0γ)=[3.92±0.20(stat)±0.24(syst)]×10−5, B(B+→K*+γ)=[3.87±0.28(stat)±0.26(syst)]×10−5. Our measurements also constrain the direct CP asymmetry to be −0.074<A(B→K*γ)<0.049 and the isospin asymmetry to be −0.046<Δ0−<0.146, both at the 90% confidence level.Received 30 June 2004DOI:https://doi.org/10.1103/PhysRevD.70.112006©2004 American Physical Society

We present measurements of the branching fractions and charge asymmetries (where appropriate) of two-body B decays to ${\ensuremath{\eta}}^{(\ensuremath{'})}{K}^{*},$ ${\ensuremath{\eta}}^{(\ensuremath{'})}\ensuremath{\rho},$ ${\ensuremath{\eta}}^{(\ensuremath{'})}{\ensuremath{\pi}}^{0},$ $\ensuremath{\omega}{\ensuremath{\pi}}^{0},$ and $\ensuremath{\varphi}{\ensuremath{\pi}}^{0}.$ The data were recorded with the BABAR detector at PEP-II and correspond to $89\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation through the $\ensuremath{\Upsilon}(4S)$ resonance. We find significant signals for two decay modes and measure the branching fractions $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*+})=(25.6\ifmmode\pm\else\textpm\fi{}4.0\ifmmode\pm\else\textpm\fi{}2.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*0})=(18.6\ifmmode\pm\else\textpm\fi{}2.3\ifmmode\pm\else\textpm\fi{}1.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ where the first error is statistical and the second systematic. We also find evidence with significance 3.5\ensuremath{\sigma} for a third decay mode and measure $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{+})=(9.2\ifmmode\pm\else\textpm\fi{}3.4\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$ For other channels, we set 90% C.L. upper limits of $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{0})&lt;1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{*+})&lt;14\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{*0})&lt;7.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\rho}}^{+})&lt;22\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\rho}}^{0})&lt;4.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{0})&lt;2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{0})&lt;3.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0})&lt;1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{0})&lt;1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$ For self-flavor-tagging modes with significant signals, the time-integrated charge asymmetries are ${\mathcal{A}}_{\mathrm{ch}}(\ensuremath{\eta}{K}^{*+})=+0.13\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.02$ and ${\mathcal{A}}_{\mathrm{ch}}(\ensuremath{\eta}{K}^{*0})=+0.02\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.02.$

We report a study of D∗sJ(2317)+ and DsJ(2460)+ meson production in B decays. We observe the decays B+→D(*)+sJ¯¯¯D(*)0 and B0→D(*)+sJD(*)− with the subsequent decays D∗sJ(2317)+→D+sπ0, DsJ(2460)+→D+sγ, and DsJ(2460)+→D*+sπ0. Based on a data sample of 122.1×106 B¯¯¯B pairs collected with the BABAR detector at the PEP-II B factory, we obtain branching fractions for these modes, including the previously unseen decays B→D(*)+sJD∗. In addition, we perform an angular analysis of DsJ(2460)+→D+sγ decays to test the different DsJ(2460)+ spin hypotheses.Received 11 August 2004DOI:https://doi.org/10.1103/PhysRevLett.93.181801©2004 American Physical Society

We present a measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic limit for B->X_c e\nu transitions, using a sample of 88 million Upsilon(4S) decays recorded by the BABAR detector. Partial branching fraction measurements are performed in five overlapping intervals of the electron momentum. For the interval of 2.0-2.6 GeV/c we obtain \Delta Br(B->X_u e\nu) = (0.572+-0.041(stat)+-0.065(syst))x10^{-3}. Combining this result with shape function parameters extracted from BABAR measurements of moments of the inclusive photon spectrum in B->X_s+gamma decays and moments of the hadron mass and lepton energy spectra in B->X_c l\nu decays we determine |V_{ub}|=((4.44+-0.25(exp) ^{+0.42}_{-0.38}(SF)+-0.22(theory))x10^{-3}. Here the first error represents the combined statistical and systematic experimental uncertainties of the partial branching fraction measurement, the second error refers to the uncertainty of the determination of the shape function parameters, and the third error is due to theoretical uncertainties in the QCD calculations.

We present measurements of branching fractions and CP-violating asymmetries in B0→ρ±π∓ and B0→ρ−K+ decays. The results are obtained from a data sample of 88.9×106 Υ(4S)→B¯¯¯B decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. From a time-dependent maximum likelihood fit we measure the branching fractions B(B0→ρ±π∓)=[22.6±1.8 (stat)±2.2 (syst)]×10−6 and B(B0→ρ−K+)=(7.3 +1.3 −1.2±1.3)×10−6, and the CP-violating charge asymmetries AρπCP=−0.18±0.08±0.03 and AρKCP=0.28±0.17±0.08, the direct CP violation parameter Cρπ=0.36±0.18±0.04 and the mixing-induced CP violation parameter Sρπ=0.19±0.24±0.03, and the dilution parameters ΔCρπ=0.28 +0.18 −0.19±0.04 and ΔSρπ=0.15±0.25±0.03.Received 13 June 2003DOI:https://doi.org/10.1103/PhysRevLett.91.201802©2003 American Physical Society

We have studied the process e+e−→μ+μ−γ at a center-of-mass energy near the Υ(4S) resonance for a μ+μ− invariant mass range near the J/ψ mass and measured the cross section σ(e+e−→J/ψγ→μ+μ−γ). The data set, corresponding to an integrated luminosity of 88.4fb−1, was collected using the BABAR detector at the SLAC PEP-II collider. From the measured cross section we extract the product Γ(J/ψ→e+e−)B(J/ψ→μ+μ−)=0.330±0.008±0.007keV. Using the world averages for B(J/ψ→μ+μ−) and B(J/ψ→e+e−), we derive the J/ψ electronic and total widths: Γ(J/ψ→e+e−)=5.61±0.20keV and Γ=94.7±4.4keV. Received 14 October 2003DOI:https://doi.org/10.1103/PhysRevD.69.011103©2004 American Physical Society

We report a measurement of the inclusive charmless semileptonic branching fraction of B mesons in a sample of 89 x 10(6) (-)BB events recorded with the BABAR detector at the Upsilon(4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson. The number of signal events is extracted from the mass distribution of the hadronic system accompanying the lepton and is used to determine the ratio of branching fractions B((-)B-->X(u)lnu;)/B((-)B-->Xlnu;)=[2.06+/-0.25(stat)+/-0.23(syst)+/-0.36(theo)]x10(-2). Using the measured branching fraction for inclusive semileptonic B decays, we find B((-)B-->X(u)lnu;)=[2.24+/-0.27(stat)+/-0.26(syst)+/-0.39(theo)]x10(-3) and derive the Cabibbo-Kobayashi-Maskawa matrix element |V(ub)|=[4.62+/-0.28(stat)+/-0.27(syst)+/-0.48(theo)]x10(-3).

Using events in which one of two neutral B mesons from the decay of an $\ensuremath{\Upsilon}(4S)$ resonance is fully reconstructed, we set limits on the difference between the decay rates of the two neutral B mass eigenstates and on CP, T, and CPT violation in ${B}^{0}{B}^{0}$ mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations $(\ensuremath{\Delta}m,\ensuremath{\Delta}\ensuremath{\Gamma}/\ensuremath{\Gamma}),$ CPT and CP violation $(\mathrm{Re}\mathsf{z},\mathrm{Im}\mathsf{z}),$ and CP and T violation $(\mathrm{Im}{\ensuremath{\lambda}}_{\mathrm{CP}},|q/p|),$ where ${\ensuremath{\lambda}}_{\mathrm{CP}}$ characterizes ${B}^{0}$ and ${B}^{0}$ decays to states of charmonium plus ${K}_{S}^{0}$ or ${K}_{L}^{0}.$ The results are $\mathrm{sgn}(\mathrm{Re}{\ensuremath{\lambda}}_{\mathrm{CP}})\ensuremath{\Delta}\ensuremath{\Gamma}/\ensuremath{\Gamma}=\ensuremath{-}0.008\ifmmode\pm\else\textpm\fi{}0.037(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.018(\mathrm{syst}.)[\ensuremath{-}0.084,0.068],$$|q/p|=1.029\ifmmode\pm\else\textpm\fi{}0.013(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.011(\mathrm{syst}.)[1.001,1.057],$$(\mathrm{Re}{\ensuremath{\lambda}}_{\mathrm{CP}}/|{\ensuremath{\lambda}}_{\mathrm{CP}}|)\mathrm{Re}\mathrm{z}=0.014\ifmmode\pm\else\textpm\fi{}0.035(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.034(\mathrm{syst}.)[\ensuremath{-}0.072,0.101],$$\mathrm{Im}\mathrm{z}=0.038\ifmmode\pm\else\textpm\fi{}0.029(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.025(\mathrm{syst}.)[\ensuremath{-}0.028,0.104].$The values inside square brackets indicate the 90% confidence-level intervals. The values of $\mathrm{Im}{\ensuremath{\lambda}}_{\mathrm{CP}}$ and $\ensuremath{\Delta}m$ are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.

We present a Dalitz-plot analysis of charmless B+- decays to the final state pi+- pi+- pi-+ using 210 fb^-1 of data recorded by the BABAR experiment at sqrt(s) = 10.58 GeV. We measure the branching fractions B(B+- -> pi+- pi+- pi-+) = (16.2 +- 1.2 +- 0.9) x 10^-6 and B(B+- -> rho^0(770) pi+-) = (8.8 +- 1.0 +- 0.6 +0.1-0.7) x 10^-6. Measurements of branching fractions for the quasi-two-body decays B+- -> rho^0(1450) pi+-, B+- -> f_0(980) pi+- and B+- -> f_2(1270) pi+- are also presented. We observe no charge asymmetries for the above modes, and there is no evidence for the decays B+- -> chic0 pi+-, B+- -> f_0(1370) pi+- and B+- -> sigma pi+-.

We search for the rare flavor-changing neutral-current decay B+→K+ν¯ν in a data sample of 82 fb−1 collected with the BABAR detector at the PEP-II B-factory. Signal events are selected by examining the properties of the system recoiling against either a reconstructed hadronic or semileptonic charged-B decay. Using these two independent samples we obtain a combined limit of B(B+→K+ν¯ν)<5.2×10−5 at the 90% confidence level. In addition, by selecting for pions rather than kaons, we obtain a limit of B(B+→π+ν¯ν)<1.0×10−4 using only the hadronic B reconstruction method.Received 17 November 2004DOI:https://doi.org/10.1103/PhysRevLett.94.101801©2005 American Physical Society

Based on a sample of 227×106 BB¯ pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0→π0π0)=(1.17±0.32±0.10)×10−6, and the asymmetry Cπ0π0=−0.12±0.56±0.06. The B0→π0π0 signal has a significance of 5.0σ. We also measure B(B+→π+π0)=(5.8±0.6±0.4)×10−6, B(B+→K+π0)=(12.0±0.7±0.6)×10−6, and the charge asymmetries Aπ+π0=−0.01±0.10±0.02 and AK+π0=0.06±0.06±0.01. Using isospin relations, we find an upper bound on the angle difference |α−αeff| of 35° at the 90% C.L.Received 13 December 2004DOI:https://doi.org/10.1103/PhysRevLett.94.181802©2005 American Physical Society

We measure the time-dependent $CP$ asymmetry parameters in ${B}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}^{0}$ based on a data sample of approximately $227\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B$-meson pairs recorded at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the PEP-II $B$-meson Factory at SLAC. We reconstruct two-body ${B}^{0}$ decays to $\ensuremath{\phi}(1020){K}_{S}^{0}$ and $\ensuremath{\phi}(1020){K}_{L}^{0}$, and the three-body decay ${K}^{+}{K}^{\ensuremath{-}}{K}_{S}^{0}$ with $\ensuremath{\phi}(1020){K}_{S}^{0}$ excluded. For the ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{K}^{0}$ decays, we measure $\mathrm{sin}2{\ensuremath{\beta}}_{\mathrm{eff}}(\ensuremath{\phi}{K}^{0})=+0.50\ifmmode\pm\else\textpm\fi{}0.25(\mathrm{stat}{)}_{\ensuremath{-}0.04}^{+0.07}(\mathrm{syst})$. The ${B}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}_{S}^{0}$ decays are dominated by ${K}^{+}{K}^{\ensuremath{-}}$ $S$ wave, as determined from an angular analysis; we measure $\mathrm{sin}2{\ensuremath{\beta}}_{\mathrm{eff}}({K}^{+}{K}^{\ensuremath{-}}{K}_{S}^{0})=+0.55\ifmmode\pm\else\textpm\fi{}0.22(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.11(CP)$, where the last error is due to the uncertainty in the fraction of $CP$-even contributions to the decay amplitude. We find no evidence for direct $CP$ violation.

Received 26 October 2006DOI:https://doi.org/10.1103/PhysRevD.74.099903©2006 American Physical Society

We present the results of a search for the decay B0→τ+τ− in a data sample of (232±3)×106 Υ(4S)→B¯¯¯B decays using the BABAR detector. Certain extensions of the standard model predict measurable levels of this otherwise rare decay. We reconstruct fully one neutral B meson and seek evidence for the signal decay in the rest of the event. We find no evidence for signal events and obtain B(B0→τ+τ−)<4.1×10−3 at the 90% confidence level.Received 9 November 2005DOI:https://doi.org/10.1103/PhysRevLett.96.241802©2006 American Physical Society

The historical techniques of panel painting manufacturing involve the preparation of boards to be used as painting support. The high affinity of wood for water can cause dimensional variations, deformations, and internal tensions. The application of a canvas over the boards, besides the choice and treatment of wood, is useful to minimize and guarantee the stability and preservation of the painting over time. The detection of the fabric is ensured with different imaging techniques, such as macro photography and radiography. The latter is mainly used to obtain information about the characteristics of the wood, the number of boards, the assembly system, and for the evaluation of the conservation state. The main advantage is the non-invasiveness of the analysis, which is a fast, simple, and widespread method. The limitations are related to different factors, such as the capacity of the materials to absorb the radiation. Despite canvas has a low radiopacity, in several cases it was possible its identification in the radiograph. This is important to investigate the technique of the artists. In our laboratory, we analyzed different panel paintings and while in some cases the fabric is easily detectable, in others it's not visible. Different variables can limit the observation of the canvas. This study is aimed at the comprehension of how acquisition parameters and painting characteristics can affect the detection of incamottatura through radiography.

We present results of a search for D0-D(-)0 mixing and a measurement of R(D), the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, using D0-->K+pi- decays from 57.1 fb(-1) of data collected near sqrt[s]=10.6 GeV with the BABAR detector at the PEP-II collider. At the 95% confidence level, allowing for CP violation, we find the mixing parameters x('2)<0.0022 and -0.056<y(')<0.039, and the mixing rate R(M)<0.16%. In the limit of no mixing, R(D)=[0.357+/-0.022(stat)+/-0.027(syst)]% and the CP-violating asymmetry A(D)=0.095+/-0.061(stat)+/-0.083(syst).

We report a measurement of the first four moments of the hadronic mass distribution in ¯B→Xcl−¯ν decays. The measurements are based on 89 million Υ(4S)→B¯B events where the hadronic decay of one of the B mesons is fully reconstructed and a charged lepton from the decay of the other B meson is identified. The moments are presented for minimum lepton momenta ranging from 0.9 to 1.6 GeV in the B rest frame. It is expected that such measurements will lead to improved determinations of |Vcb| and |Vub|. Received 23 January 2004DOI:https://doi.org/10.1103/PhysRevD.69.111103©2004 American Physical Society

We present an analysis of exclusive charmless semileptonic $B$-meson decays based on $83\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs recorded with the BABAR detector at the $\ensuremath{\Upsilon}(4S)$ resonance. Using isospin symmetry, we measure branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu})=(1.38\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.08)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu})=(2.14\ifmmode\pm\else\textpm\fi{}0.21\ifmmode\pm\else\textpm\fi{}0.48\ifmmode\pm\else\textpm\fi{}0.28)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, where the errors are statistical, experimental systematic, and due to form-factor shape uncertainties. We compare the measured distribution in ${q}^{2}$, the momentum-transfer squared, with theoretical predictions for the form factors from lattice QCD and light-cone sum rules, and extract the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $|{V}_{ub}|=(3.82\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.22\ifmmode\pm\else\textpm\fi{}{0.11}_{\ensuremath{-}0.52}^{+0.88})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ from $B\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\ell}\ensuremath{\nu}$, where the fourth error reflects the uncertainty of the form-factor normalization.

We present measurements of the branching fractions of the decays B+-->eta'K+ and B0-->eta'K0. For B0-->eta(')K(0)(S) we also measure the time-dependent CP-violation parameters S eta'(K(0)(S)) and C eta'(K(0)(S)), and for B+-->eta'K+ the time-integrated charge asymmetry A(ch). The data sample corresponds to 88.9 x 10(6) BB pairs produced by e(+)e(-) annihilation at the Upsilon(4S). The results are B(B+-->eta'K+)=(76.9+/-3.5+/-4.4) x 10(-6), B(B0-->eta'K0)=(60.6+/-5.6+/-4.6) x 10(-6), S eta'(K(0)(S))=0.02+/-0.34+/-0.03, C eta'(K(0)(S))=0.10+/-0.22+/-0.04, and A(ch)=0.037+/-0.045+/-0.011.

We report measurements of branching fractions and charge asymmetries of exclusive decays of neutral and charged B mesons into two-body final states containing a charmonium state and a light strange meson. The charmonium mesons considered are J/ψ, ψ(2S) and χc1, and the light meson is either K or K∗. We use a sample of about 124×106 B¯¯¯B pairs collected with the BABAR detector at the PEP-II storage ring at the Stanford Linear Accelerator Center.Received 22 December 2004DOI:https://doi.org/10.1103/PhysRevLett.94.141801©2005 American Physical Society

A search for lepton-flavor and lepton-number violation in the decay of the tau lepton into one charged lepton and two charged hadrons is performed using 221.4 fb−1 of data collected at an e+e− center-of-mass energy of 10.58 GeV with the BABAR detector at the SLAC PEP-II storage ring. In all 14 decay modes considered, the observed data are compatible with background expectations, and upper limits are set in the range B(τ→ℓhh′)<(0.7−4.8)×10−7 at 90% confidence level.Received 23 June 2005DOI:https://doi.org/10.1103/PhysRevLett.95.191801©2005 American Physical Society

The Λ+c baryon mass is measured using Λ+c→ΛK0SK+ and Λ+c→Σ0K0SK+ decays reconstructed in 232 fb−1 of data collected with the BABAR detector at the PEP-II asymmetric-energy e+e− storage ring. The Λ+c mass is measured to be 2286.46±0.14 MeV/c2. The dominant systematic uncertainties arise from the amount of material in the tracking volume and from the magnetic field strength.Received 1 July 2005DOI:https://doi.org/10.1103/PhysRevD.72.052006©2005 American Physical Society

We present a study of the decay ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ based on a sample of $124\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We observe $46\ifmmode\pm\else\textpm\fi{}13\ifmmode\pm\else\textpm\fi{}3$ events, where the first error is statistical and the second is systematic, corresponding to a significance of $4.2$ standard deviations including systematic uncertainties. We measure the branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(2.1\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, averaged over ${B}^{0}$ and ${\overline{B}}^{0}$ decays.

We present a measurement of D0-macro D0 mixing parameters using the ratios of lifetimes extracted from samples of D0 mesons decaying to K-pi(+), K-K+, and pi(-)pi(+). Using 91 fb(-1) of data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory, we obtain a value Y=[0.8+/-0.4(stat.)(+0.5)(-0.4)(syst.)]%, which, in the limit of CP conservation, corresponds to the mixing parameter y=Delta Gamma/2 Gamma. Using the difference in lifetimes of D0 and macro D0 mesons, we obtain the CP-violation parameter Delta Y=[-0.8+/-0.6(stat.)+/-0.2(syst.)]%.

We present results from an analysis of B(0)B(0)--> rho(+)rho(-) using 232 x 10(6) Gamma (4S) --> BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction f(L) = 0.978 +/- 0.014(stat) + 0.021 / -0.029(syst) and the CP-violating parameters S(L)= -0.33 +/- 0.24(stat) + 0.08 / -0.14(syst) and C(L)= -0.03 +/- 0.18(stat) +/- 0.09(syst). Using an isospin analysis of B --> rhorho decays, we determine the unitarity triangle parameter alpha. The solution compatible with the standard model is alpha = (100 +/- 13) degrees.

We report a measurement of the production ratio of charged and neutral B mesons from Υ(4S) decays based on the ratio of efficiency-corrected yields for the charmonium modes J/ψK+ and J/ψK0s with 81.9 fb−1 of data collected with the BABAR detector on the Υ(4S) resonance at 10.580 GeV. We find a value of 1.006±0.036(stat)±0.031(syst) for the ratio R+/0=Γ(Υ(4S)→B+B−)/Γ(Υ(4S)→B0B0). Received 16 January 2004DOI:https://doi.org/10.1103/PhysRevD.69.071101©2004 American Physical Society

We have investigated the exclusive, radiative $B$ meson decays to ${K}_{2}^{*}(1430)$ in $89\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events with the BABAR detector at the PEP-II storage ring. We measure the branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{K}_{2}^{*}(1430{)}^{0}\ensuremath{\gamma})=(1.22\ifmmode\pm\else\textpm\fi{}0.25\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}_{2}^{*}(1430{)}^{+}\ensuremath{\gamma})=(1.45\ifmmode\pm\else\textpm\fi{}0.40\ifmmode\pm\else\textpm\fi{}0.15)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the first error is statistical and the second systematic. In addition, we measure the $CP$-violating asymmetry ${\mathcal{A}}_{CP}[{B}^{0}\ensuremath{\rightarrow}{K}_{2}^{*}(1430{)}^{0}\ensuremath{\gamma}]=\ensuremath{-}0.08\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.01$.

We present results of searches for B-meson decays to K+ pi- pi+ with the BaBar detector. With a data sample of 61.6 million BBbar pairs, we measure the branching fractions and 90% confidence-level upper limits averaged over charge-conjugate states (the first error is statistical and the second is systematic): B+ --&gt; K*0 pi+ = (15.5 +/- 1.8 +1.5 -4.0) x 10^-6, B+ --&gt; f0 K+, f_0 --&gt; pi+ pi- = (9.2 +/- 1.2 +2.1 -2.6) x 10^-6, B+ --&gt; D0bar pi+, D0bar --&gt; K+ pi- = (184.6 +/- 3.2 +/- 9.7) x 10^-6. B+ --&gt; rho K+ &lt; 6.2 x 10^-6 and B+ --&gt; K+ pi- pi+ non-resonant &lt; 17 x 10^-6.

Using events in which one of two neutral $B$ mesons from the decay of an $\ensuremath{\Upsilon}(4S)$ meson is fully reconstructed, we determine parameters governing decay $(\ensuremath{\Delta}{\ensuremath{\Gamma}}_{d}/{\ensuremath{\Gamma}}_{d})$, $CP$, and $T$ violation ($|q/p|$), and $CP$ and $CPT$ violation ($\mathrm{Re}\text{ }\mathsf{z},\mathrm{Im}\text{ }\mathsf{z}$). The results, obtained from an analysis of $88\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)$ decays recorded by BABAR, are $\mathrm{sgn}(\mathrm{Re}\text{ }{\ensuremath{\lambda}}_{CP})\ensuremath{\Delta}{\ensuremath{\Gamma}}_{d}/{\ensuremath{\Gamma}}_{d}=\ensuremath{-}0.008\ifmmode\pm\else\textpm\fi{}0.037(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.018(\mathrm{syst})[\ensuremath{-}0.084,0.068],|q/p|=\phantom{\rule{0ex}{0ex}}1.029\ifmmode\pm\else\textpm\fi{}0.013(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.011(\mathrm{syst})[1.001,1.057],(\mathrm{Re}\text{ }{\ensuremath{\lambda}}_{CP}/|{\ensuremath{\lambda}}_{CP}|)\text{ }\mathrm{Re}\text{ }\mathsf{z}=0.014\ifmmode\pm\else\textpm\fi{}0.035(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.034(\mathrm{syst})\phantom{\rule{0ex}{0ex}}[\ensuremath{-}0.072,0.101],\mathrm{Im}\text{ }\mathsf{z}=0.038\ifmmode\pm\else\textpm\fi{}0.029(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.025(\mathrm{syst})[\ensuremath{-}0.028,0.104].$ The values inside the square brackets indicate the 90% confidence-level intervals. These results are consistent with standard model expectations.

We present a measurement of the parameters of the $\Upsilon(10580)$ resonance based on a dataset collected with the BABAR detector at the SLAC PEP-II asymmetric $B$ factory. We measure the total width $\Gamma_{\rm tot}$ to be $(20.7\pm1.6\pm2.5) {\rm MeV}$, the electronic partial width $\Gamma_{ee} = (0.321\pm0.017\pm0.029) {\rm keV}$ and the mass $M = (10579.3\pm0.4\pm1.2) {\rm MeV/c^2}$.

We present a measurement of the time-dependent CP-violating asymmetries in decays of neutral B mesons to the final states D*-+ pi+-, using approximately 232 million BBbar events recorded by the BABAR experiment at the PEP2 e+e- storage ring. Events containing these decays are selected with a partial reconstruction technique, in which only the high-momentum pi+- from the B decay and the low-momentum pi-+ from the D*-+ decay are used. % We measure the parameters related to 2beta+gamma to be a_D*pi=-0.034 +- 0.014 +- 0.009 and c_l_D*pi = -0.019 +- 0.022 +- 0.013. With some theoretical assumptions, we interpret our results in term of the lower limits |\sin(2beta+gamma)|&gt; 0.62 (0.35) at 68% (90%) confidence level.

We have observed the rare decay B0→ρ+ρ− in a sample of 89 million B¯B pairs recorded with the BABAR detector. The number of observed events is 88+23−21±9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be B(B0→ρ+ρ−)=(25+7+5−6−6)×10−6 and ΓL/Γ=0.98+0.02−0.08±0.03, respectively.Received 6 November 2003DOI:https://doi.org/10.1103/PhysRevD.69.031102©2004 American Physical Society

We present the result of a search for the charmless two-body baryonic decay B0→p¯p in a sample of 88 million Υ(4S)→B¯B decays collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. We use Cherenkov radiation to identify protons cleanly, and determine the signal yield with a maximum-likelihood fit technique using kinematic and topological information. We find no evidence for a signal and place a 90% confidence-level upper limit of B(B0→p¯p)<2.7×10−7. Received 1 March 2004DOI:https://doi.org/10.1103/PhysRevD.69.091503©2004 American Physical Society

We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{ub}|$ based on the analysis of semileptonic $B$ decays from a sample of $88\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)$ decays collected with the BABAR detector at the SLAC PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ storage ring. Charmless semileptonic $B$ decays are selected using measurements of the electron energy and the invariant mass squared of the electron-neutrino pair. We obtain $|{V}_{ub}|=(3.95\ifmmode\pm\else\textpm\fi{}{0.26}_{\ensuremath{-}0.42}^{+0.58}\ifmmode\pm\else\textpm\fi{}0.25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, where the errors represent experimental uncertainties, heavy quark parameter uncertainties, and theoretical uncertainties, respectively.

We search for strange-pentaquark states that have been previously reported by other experiments—the Θ(1540)+, Ξ5(1860)−−, and Ξ5(1860)0—in 123 fb−1 of data recorded with the BABAR detector at the PEP-II e+e− storage ring. We find no evidence for these states and set 95% confidence level upper limits on the number of Θ(1540)+ and Ξ5(1860)−− pentaquarks produced per e+e− annihilation into q¯q and per Υ(4S) decay. For q¯q events the Θ(1540)+ [Ξ5(1860)−−] limit is about 8 [4] times lower than the rates measured for ordinary baryons of similar mass.Received 1 February 2005DOI:https://doi.org/10.1103/PhysRevLett.95.042002©2005 American Physical Society

We present measurements of the branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{D}_{s}^{*+})$ and $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+})$, based on $123\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected by the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}\text{ }\text{ }B$ factory. A partial reconstruction technique is used to measure $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{D}_{s}^{*+})$ and the decay chain is fully reconstructed to measure the branching fraction product $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{D}_{s}^{*+})\ifmmode\times\else\texttimes\fi{}\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+})$. Comparing these two measurements provides a model-independent determination of the ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}$ branching fraction. We obtain $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{D}_{s}^{*+})=(1.88\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.17)%$ and $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+})=(4.81\ifmmode\pm\else\textpm\fi{}0.52\ifmmode\pm\else\textpm\fi{}0.38)%$, where the first uncertainties are statistical and the second systematic.

We analyze the decay ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using a sample of $232\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy $B$ factory. A maximum likelihood fit finds the following branching fractions: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(43.0\ifmmode\pm\else\textpm\fi{}2.3\ifmmode\pm\else\textpm\fi{}2.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},\text{ }\text{ }\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{f}_{0}(\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}){K}^{0})=(5.5\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{K}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}})=(11.0\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. For these results, the first uncertainty is statistical, the second is systematic, and the third (if present) is due to the effect of interference from other resonances. We also measure the $CP$-violating charge asymmetry in the decay ${B}^{0}\ensuremath{\rightarrow}{K}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\mathcal{A}}_{{K}^{*}\ensuremath{\pi}}=\ensuremath{-}0.11\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.05$.

We present results for the branching fractions and charge asymmetries in B+/--->h(+/-)pi(0) (where h(+/-)=pi(+/-),K+/-) and a search for the decay B0-->pi(0)pi(0) using a sample of approximately 88 x 10(6) BBmacr; pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure B(B+/--->pi(+/-)pi(0))=(5.5(+1.0)(-0.9)+/-0.6)x10(-6), where the first error is statistical and the second is systematic. The B+/--->pi(+/-)pi(0) signal has a significance of 7.7sigma including systematic uncertainties. We simultaneously measure the K+/-pi(0) branching fraction to be B(B+/--->K+/-pi(0))=(12.8(+1.2)(-1.1)+/-1.0)x10(-6). The charge asymmetries are Api(+/-)(pi(0))=-0.03(+0.18)(-0.17)+/-0.02 and AK+/-(pi(0))=-0.09+/-0.09+/-0.01. We place a 90% confidence-level upper limit on the branching fraction B(B0-->pi(0)pi(0)) of 3.6 x 10(-6).

We describe a measurement of the direct CP asymmetry between inclusive b→sγ and b¯→s¯γ decays. This asymmetry is expected to be less than 0.01 in the standard model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89×106 BB¯ pairs recorded with the BABAR detector at SLAC PEP-II, from which we reconstruct a set of 12 exclusive b→sγ final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of ACP(b→sγ)=0.025±0.050(stat)±0.015(syst), corresponding to an allowed range of −0.06<ACP(b→sγ)<+0.11 at 90% confidence level.Received 23 March 2004DOI:https://doi.org/10.1103/PhysRevLett.93.021804©2004 American Physical Society

We report evidence for the decays B0-->D(+)(s)pi(-) and B0-->D(-)(s)K+ and the results of a search for B0-->D(*+)(s)pi(-) and B0-->D(*-)(s)K+ in a sample of 84 x 10(6) upsilon(4S) decays into BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) storage ring. We measure the branching fractions B(B0-->D(+)(s)pi(-))=[3.2+/-0.9(stat)+/-1.0(syst)] x 10(-5) and B(B0-->D(-)(s)K+)=[3.2+/-1.0(stat)+/-1.0(syst)] x 10(-5). We also set 90% C.L. limits B(B0-->D(*+)(s)pi(-))<4.1 x 10(-5) and B(B0-->D(*-)(s)K+)<2.5 x 10(-5).

We present measurements of branching fractions and charge asymmetries in B-meson decays to rho(+)pi(0), rho(0)pi(+), and rho(0)pi(0). The data sample comprises 89x10(6) Upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the charge-averaged branching fractions B(B+-->rho(+)pi(0))=[10.9+/-1.9(stat)+/-1.9(syst)]x10(-6) and B(B+-->rho(0)pi(+))=(9.5+/-1.1+/-0.9)x10(-6), and we set a 90% confidence-level upper limit B(B0-->rho(0)pi(0))<2.9x10(-6). We measure the charge asymmetries ACP(pi(0))(rho(+))=0.24+/-0.16+/-0.06 and ACP(pi(+))(rho(0))=-0.19+/-0.11+/-0.02.

We report a study of the B meson decays, B+ -> J/psi phi K+, B0 -> J/psi phi K0S, B0 -> J/psi phi, B0 -> J/psi eta and B0 -> J/psi eta' using 56 million BBbar events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e+ e- asymmetric-energy storage ring. We measure the branching fractions B(B+ -> J/psi phi K+) = (4.4 +- 1.4(stat) +- 0.5(syst)) * 10-5 and B(B0 -> J/psi phi K0S) = (5.1 +- 1.9(stat) +- 0.5(syst)) * 10^-5, and set upper limits at 90% confidence level for the branching fractions B(B0 -> J/psi phi) < 9.2 * 10^-6, B(B0 -> J/psi eta)< 2.7 * 10^-5, and B(B0 -> J/psi eta')< 6.3 * 10-5.

We present measurements of the branching fraction and CP-violating asymmetries in the decay B0-->f0(980)K0S. The results are obtained from a data sample of 123 x 10(6) Upsilon(4S)-->BB decays. From a time-dependent maximum likelihood fit, we measure the branching fraction B(B0-->f0(980)(-->pi+pi-)K0)=(6.0+/-0.9+/-0.6+/-1.2)x10(-6), the mixing-induced CP violation parameter S=-1.62(+0.56)(-0.51)+/-0.09+/-0.04, and the direct CP violation parameter C=0.27+/-0.36+/-0.10+/-0.07, where the first errors are statistical, the second systematic, and the third due to model uncertainties. We measure the f0(980) mass and width to be mf0(980)=(980.6+/-4.1+/-0.5+/-4.0) MeV/c2 and Gammaf0(980)=(43(+12)(-9)+/-3+/-9) MeV/c2, respectively.

We present a measurement of the time-dependent $CP$-violating asymmetry in ${B}^{0}\ensuremath{\rightarrow}{K}^{*0}\ensuremath{\gamma}$ decays with ${K}^{*0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}$ based on $232\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at SLAC. In a sample containing $157\ifmmode\pm\else\textpm\fi{}16$ signal decays, we measure ${S}_{{K}^{*0}\ensuremath{\gamma}}=\ensuremath{-}0.21\ifmmode\pm\else\textpm\fi{}0.40\ifmmode\pm\else\textpm\fi{}0.05$ and ${C}_{{K}^{*0}\ensuremath{\gamma}}=\ensuremath{-}0.40\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.03$, where the first error is statistical and the second systematic. We also explore ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ decays with $1.1&lt;{m}_{{K}_{S}^{0}{\ensuremath{\pi}}^{0}}&lt;1.8$ $\mathrm{GeV}/{c}^{2}$ and find $59\ifmmode\pm\else\textpm\fi{}13$ signal events with ${S}_{{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}}=0.9\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}0.2$ and ${C}_{{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}}=\ensuremath{-}1.0\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.2$.

We report two novel determinations of |Vub| with reduced model dependence, based on measurements of the mass distribution of the hadronic system in semileptonic B decays. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson from Y(4S) to BBbar events. In one approach, we combine the inclusive B to X_u l nu rate, integrated up to a maximum hadronic mass m_X < 1.67GeV, with a measurement of the inclusive B to X_s gamma photon energy spectrum. We obtain |Vub| = (4.43 +- 0.38stat +- 0.25syst +- 0.29theo)*10^-3. In another approach we measure the total B to X_u l nu rate over the full phase space and find |Vub| = (3.84 +- 0.70stat +- 0.30syst +- 0.10theo)*10^-3.

A Dalitz plot analysis of approximately 12 500 ${D}^{0}$ events reconstructed in the hadronic decay ${D}^{0}\ensuremath{\rightarrow}{\overline{K}}^{0}{K}^{+}{K}^{\ensuremath{-}}$ is presented. This analysis is based on a data sample of $91.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ storage rings at SLAC running at center-of-mass energies on and 40 MeV below the $\ensuremath{\Upsilon}(4S)$ resonance. The events are selected from ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ annihilations using the decay ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}$. The following ratio of branching fractions has been obtained: $BR=\frac{\ensuremath{\Gamma}({D}^{0}\ensuremath{\rightarrow}{\overline{K}}^{0}{K}^{+}{K}^{\ensuremath{-}})}{\ensuremath{\Gamma}({D}^{0}\ensuremath{\rightarrow}{\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})}=(15.8\ifmmode\pm\else\textpm\fi{}0.1(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}.$ Estimates of fractions and phases for resonant and nonresonant contributions to the Dalitz plot are also presented. The ${a}_{0}(980)\ensuremath{\rightarrow}\overline{K}K$ projection has been extracted with little background. A search for $CP$ asymmetries on the Dalitz plot has been performed.

Flavor oscillations of neutral B mesons have been studied in e+e- annihilation data collected with the BABAR detector at center-of-mass energies near the upsilon(4S) resonance. The data sample used for this purpose consists of events in which one B0 meson is reconstructed in a hadronic decay mode, while the flavor of the recoiling B0 is determined with a tagging algorithm that exploits the correlation between the flavor of the heavy quark and the charges of its decay products. From the time development of the observed mixed and unmixed final states, we determine the B0-B-0 oscillation frequency deltamd to be 0.516+/-0.016(stat)+/-0.010(syst) ps-1.

We present results from a search for the flavor-changing neutral current decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-), where l(+)l(-) is either an e(+)e(-) or mu(+)mu(-) pair. The data sample comprises 22.7 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the PEP-II B Factory. We obtain the 90% C.L. upper limits B(B-->Kl(+)l(-))<0.51 x 10(-6) and B(B-->K(*)l(+)l(-))<3.1 x 10(-6), close to standard model predictions for these branching fractions. We have also obtained limits on the lepton-family-violating decays B-->Ke+/-mu(-/+) and B-->K(*)e(+/-)mu(-/+).

A largely model-independent measurement of the inclusive electron momentum spectrum and branching fraction for semileptonic decays of B mesons is presented based on data recorded at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector. Backgrounds from secondary charm decays are separated from prompt B decays using charge and angular correlations between the electron from one B meson and a high momentum electron tag from the second B meson. The resulting branching fraction is $\mathcal{B}(\stackrel{\ensuremath{\rightarrow}}{B}\mathrm{Xe}\ensuremath{\nu})=[10.87\ifmmode\pm\else\textpm\fi{}0.18(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.30(\mathrm{syst})]%.$ Based on this measurement we determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $|{V}_{\mathrm{cb}}|.$

Using a sample of $88.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center, we measure the branching fractions of seven color-suppressed B-meson decays: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0})=[2.9\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\pi}}^{0})=[2.9\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\eta})=[2.5\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\eta})=[2.6\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\omega})=[3.0\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\omega})=[4.2\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4},$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\eta}}^{\ensuremath{'}})=[1.7\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ We set the 90% confidence-level upper limit: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*0}{\ensuremath{\eta}}^{\ensuremath{'}})&lt;2.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ The channels ${B}^{0}\ensuremath{\rightarrow}{D}^{*0}\ensuremath{\eta},$ ${D}^{*0}\ensuremath{\omega},$ and ${D}^{0}{\ensuremath{\eta}}^{\ensuremath{'}}$ are seen with more than five-sigma statistical significance. All of these branching fractions are significantly larger than theoretical expectations based on the ``naive'' factorization model.

Based on an $87\mathrm{\text{\ensuremath{-}}}{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data set collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory, a search for ${D}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{D}}^{0}$ mixing has been made using the semileptonic decay modes ${D}^{*+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{D}^{0}$, ${D}^{0}\ensuremath{\rightarrow}{K}^{(*)}e\ensuremath{\nu}$ (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the ${D}^{0}$ decay time and ${D}^{*+}\mathrm{\text{\ensuremath{-}}}{D}^{0}$ mass difference ($\ensuremath{\Delta}M$) distributions. The high-statistics sample of unmixed semileptonic ${D}^{0}$ decays is used to model the $\ensuremath{\Delta}M$ distribution and time dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the ${D}^{0}$. A result consistent with no charm mixing has been obtained, ${R}_{\mathrm{m}\mathrm{i}\mathrm{x}}=0.0023\ifmmode\pm\else\textpm\fi{}0.0012\ifmmode\pm\else\textpm\fi{}0.0004$. This corresponds to an upper limit of ${R}_{\mathrm{m}\mathrm{i}\mathrm{x}}&lt;0.0042$ (90% C.L.).

We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay B0 --> Phi K0. We use a sample of approximately 114 million B-meson pairs taken at the Upsilon(4S) resonance with the BaBar detector at the PEP-II B-meson Factory at SLAC. We reconstruct the CP eigenstates Phi K0_S and Phi K0_L where Phi --> K+ K-, K0_S --> pi+ pi-, and K0_L is observed via its hadronic interactions. The other B meson in the event is tagged as either a B0 or B0-bar from its decay products. The values of the CP-violation parameters are S = 0.47 +/- 0.34 (stat) +0.08/-0.06 (syst) and C = 0.01 +/- 0.33 (stat) +/- 0.10 (syst).

We present measurements of branching fractions and charge asymmetries for charmless $B$-meson decays to three-body final states of charged pions and kaons. The analysis uses $81.8\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ of data collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II asymmetric $B$ Factory. We measure the branching fractions $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(10.9\ifmmode\pm\else\textpm\fi{}3.3\ifmmode\pm\else\textpm\fi{}1.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(59.1\ifmmode\pm\else\textpm\fi{}3.8\ifmmode\pm\else\textpm\fi{}3.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}^{+})=(29.6\ifmmode\pm\else\textpm\fi{}2.1\ifmmode\pm\else\textpm\fi{}1.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and provide 90% C.L. upper limits for other decays. We observe no charge asymmetries for these modes.

We measure the branching fraction and the $CP$-violating asymmetry of ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}$ decays with $227$ million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at SLAC. We obtain a branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{0})=(11.4\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $CP$-violating asymmetry parameters ${C}_{{K}_{S}^{0}}{\ensuremath{\pi}}^{0}=0.06\ifmmode\pm\else\textpm\fi{}0.18\ifmmode\pm\else\textpm\fi{}0.03$ and ${S}_{{K}_{S}^{0}}{\ensuremath{\pi}}^{0}={0.35}_{\ensuremath{-}0.33}^{+0.30}\ifmmode\pm\else\textpm\fi{}0.04$, where the first error is statistical and the second systematic.

We search for the decay B0→ρ0ρ0 in a data sample of about 227×106 Υ(4S)→B¯¯¯B decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at SLAC. We find no significant signal and set an upper limit of 1.1×10−6 at 90% C.L. on the branching fraction. As a result, the uncertainty due to penguin contributions on the Cabibbo-Kobayashi-Maskawa unitarity angle α measured in B→ρρ decays is decreased to 11° at 68% C.L.Received 23 December 2004DOI:https://doi.org/10.1103/PhysRevLett.94.131801©2005 American Physical Society

We report the results of a search for T and CP violation in B0-B-0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between l+l+ and l-l- events allows us to compare the probabilities for B-0-->B0 and B0-->B-0 oscillations and thus probe T and CP invariance. Using a sample of 23 x 10(6) BB- pairs, we measure a same-sign dilepton asymmetry of A(T/CP) = [0.5+/-1.2(stat)+/-1.4(syst)]%. For the modulus of the ratio of complex mixing parameters p and q, we obtain q/p = 0.998+/-0.006(stat)+/-0.007(syst).

We present measurements of branching fractions and charge asymmetries for seven $B$-meson decays with an $\ensuremath{\eta}$, ${\ensuremath{\eta}}^{\ensuremath{'}}$, or $\ensuremath{\omega}$ meson in the final state. The data sample corresponds to $89\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced from ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at the $\ensuremath{\Upsilon}(4S)$ resonance. We measure the following branching fractions in units of ${10}^{\ensuremath{-}6}$: $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+})=5.3\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}0.3$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{+})=3.4\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.2$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{0})=2.9\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}0.2$ ($&lt;5.2$, 90% C.L.), $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})=2.7\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}0.3$ ($&lt;4.5$, 90% C.L.), $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+})=5.5\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}0.5$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+})=4.8\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.4$, and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{0})={5.9}_{\ensuremath{-}1.3}^{+1.6}\ifmmode\pm\else\textpm\fi{}0.5$. The charge asymmetries are ${\mathcal{A}}_{\mathrm{c}\mathrm{h}}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+})=\ensuremath{-}0.44\ifmmode\pm\else\textpm\fi{}0.18\ifmmode\pm\else\textpm\fi{}0.01$, ${\mathcal{A}}_{\mathrm{c}\mathrm{h}}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{+})=\ensuremath{-}0.52\ifmmode\pm\else\textpm\fi{}0.24\ifmmode\pm\else\textpm\fi{}0.01$, ${\mathcal{A}}_{\mathrm{c}\mathrm{h}}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+})=0.03\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.01$, and ${\mathcal{A}}_{\mathrm{c}\mathrm{h}}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+})=\ensuremath{-}0.09\ifmmode\pm\else\textpm\fi{}0.17\ifmmode\pm\else\textpm\fi{}0.01$.

We present a measurement of the time-dependent CP-violating (CPV) asymmetries in B0-->K(0)(S)pi(0) decays based on 124x10(6) Upsilon(4S)-->BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. In a sample containing 122+/-16 signal decays, we obtain the magnitudes of the direct CPV asymmetry CK(0)(S)(pi(0))=0.40(+0.27)(-0.28)+/-0.09 and of the CPV asymmetry in the interference between mixing and decay SK(0)(S)(pi(0))=0.48(+0.38)(-0.47)+/-0.06 where the first error is statistical and the second systematic.

The ${B}^{0}\ensuremath{-}{\overline{B}}^{0}$ oscillation frequency has been measured with a sample of $23\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we select events in which both $B$ mesons decay semileptonically and use the charge of the leptons to identify the flavor of each $B$ meson. A simultaneous fit to the decay time difference distributions for opposite- and same-sign dilepton events gives $\ensuremath{\Delta}{m}_{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.493\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst}){\mathrm{ps}}^{\ensuremath{-}1}$.

We report on a search for the $CP$ asymmetry in the singly Cabibbo-suppressed decays ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+}$ and in the resonant decays ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}$ and ${D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{*0}{K}^{+}$ based on a data sample of $79.9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded by the BABAR detector. We use the Cabibbo-favored ${D}_{s}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+}$ branching fraction as normalization in the measurements to reduce systematic uncertainties. The $CP$ asymmetries obtained are ${A}_{CP}({K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})=(1.4\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.8(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, ${A}_{CP}(\ensuremath{\phi}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})=(0.2\ifmmode\pm\else\textpm\fi{}1.5(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.6(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, and ${A}_{CP}({\overline{K}}^{*0}{K}^{\ifmmode\pm\else\textpm\fi{}})=(0.9\ifmmode\pm\else\textpm\fi{}1.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$. The relative branching fraction $\ensuremath{\Gamma}({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+})/\ensuremath{\Gamma}({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})$ is also measured and is found to be $(10.7\ifmmode\pm\else\textpm\fi{}0.1(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$.

We search for ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\stackrel{\texttildelow{}}{D}}^{0}{K}^{\ensuremath{-}}$ and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\stackrel{\texttildelow{}}{D}}^{*0}{K}^{\ensuremath{-}}$ and charge conjugates. Here the symbol ${\stackrel{\texttildelow{}}{D}}^{0}$ indicates decay of a ${D}^{0}$ or ${\overline{D}}^{0}$ into ${K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, while the symbol ${\stackrel{\texttildelow{}}{D}}^{*0}$ indicates decay of a ${D}^{*0}$ or ${\overline{D}}^{*0}$ to ${\stackrel{\texttildelow{}}{D}}^{0}{\ensuremath{\pi}}^{0}$ or ${\stackrel{\texttildelow{}}{D}}^{0}\ensuremath{\gamma}$. These final states can be reached through the $b\ensuremath{\rightarrow}c$ transition ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{K}^{\ensuremath{-}}$ followed by the doubly Cabibbo-Kobayashi-Maskawa (CKM)-suppressed ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, or the $b\ensuremath{\rightarrow}u$ transition ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{(*)0}{K}^{\ensuremath{-}}$ followed by the CKM-favored ${\overline{D}}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. The interference of these two amplitudes is sensitive to the angle $\ensuremath{\gamma}$ of the unitarity triangle. Our results are based on $232\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at SLAC. We find no significant evidence for these decays. We set a limit ${r}_{B}\ensuremath{\equiv}|A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{\ensuremath{-}})/A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{K}^{\ensuremath{-}})|&lt;0.23$ at 90% C.L. using the most conservative assumptions on the values of the CKM angle $\ensuremath{\gamma}$ and the strong phases in the $B$ and $D$ decay amplitudes. In the case of the ${D}^{*}$ we set a 90% C.L. limit ${r}_{B}^{*2}\ensuremath{\equiv}|A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{*0}{K}^{\ensuremath{-}})/A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{*0}{K}^{\ensuremath{-}}){|}^{2}&lt;(0.16{)}^{2}$ which is independent of assumptions on $\ensuremath{\gamma}$ and strong phases.

We present a search for the decay B(-)--> tau(-)nu(tau) in a sample of 88.9 x 10(6) BB pairs recorded with the BABAR detector at the Stanford Linear Accelerator Center B factory. One of the two B mesons from the Gamma(4S) is reconstructed in a hadronic or a semileptonic final state, and the decay products of the other B in the event are analyzed for consistency with a B(-) --> tau(-)nu(tau) decay. We find no evidence of a signal and set an upper limit on the branching fraction of B(B(-) --> tau(-) nu(tau)) < 4.2 x 10(-4) at the 90% confidence level.

We report the first measurement of the branching fraction f(00) for Gamma(4S) --> B(0)B(0). The data sample consists of 81.7 fb(-1) collected at the Gamma(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric-energy e(+)e(-) storage ring. Using partial reconstruction of the decay B(0) --> D(*+) l(-)nu(l) in which only the charged lepton and the soft pion from the decay D(*+) --> D(0)pi(+) are reconstructed, we obtain f(00) = 0.487 +/- 0.010(stat) +/- 0.008(syst). Our result does not depend on the branching fractions of B(0) --> D(*+)l(-)nu(l) and D(*+) --> D(0)pi(+) decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.

We present a simultaneous measurement of the B0bar lifetime tau_B0 and B0B0bar oscillation frequency Delta_md. We use a sample of about 50000 partially reconstructed B0bar --> D*+ ell- nu-bar decays identified with the BABAR detector at the PEP-II e+e- storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton. The results are tau_B0 = (1.504 +/- 0.013 (stat) {+0.018}/{-0.013} (syst)) ps, Delta_md = (0.511 +/- 0.007 (stat) {+0.007}/{-0.006} (syst)) ps-1

The interest in change detection in the field of remote sensing has increased in the last few years. Searching for changes in satellite images has many useful applications, ranging from land cover and land use analysis to anomaly detection. In particular, urban change detection provides an efficient tool to study urban spread and growth through several years of observation. At the same time, change detection is often a computationally challenging and time-consuming task; therefore, a standard approach with manual detection of the elements of interest by experts in the domain of Earth Observation needs to be replaced by innovative methods that can guarantee optimal results with unquestionable value and within reasonable time. In this paper, we present two different approaches to change detection (semantic segmentation and classification) that both exploit convolutional neural networks to address these particular needs, which can be further refined and used in post-processing workflows for a large variety of applications.