F. Ukegawa

The Central Outer Tracker is a large cylindrical drift chamber constructed to replace Collider Detector at Fermilab's original central drift chamber for the higher luminosity expected for Run 2 at the Fermilab Tevatron. The chamber's drift properties are described in the context of meeting the operating requirements for Run 2. The design and construction of the chamber, the front-end readout electronics, and the high-voltage system are described in detail. Wire aging considerations are also discussed.

We report a measurement of the fraction of b quarks produced diffractively in &pmacr;p collisions at sqrt[s] = 1.8 TeV. Diffraction is identified by the absence of particles in a forward pseudorapidity region. From events with an electron of transverse momentum 9.5<p(e)(T)<20 GeV/ c within the pseudorapidity region |eta|<1.1, the ratio of diffractive to total b-quark production rates is found to be R(&bmacr;b) = [0.62+/-0.19(stat)+/-0.16(syst)]%. This result is comparable in magnitude to corresponding ratios for W and dijet production but significantly lower than expectations based on factorization.

A Time-of-Flight (TOF) detector, based on plastic scintillators and fine-mesh photomultipliers, has been added to the Collider Detector at Fermilab (CDF)-II experiment at the Tevatron pp̄ collider. The primary physics motivation is to provide charged kaon identification to improve neutral B meson flavor determination. Besides that, the TOF detector found application in the CDF trigger system in implementation of highly ionizing particle, high multiplicity and cosmic rays triggers.

An angular analysis of B0-->J/psiK(*0) and B(0)(s)-->J/psistraight phi has been used to determine the decay amplitudes with parity-even longitudinal ( A0) and transverse ( A( parallel)) polarization and parity-odd transverse ( A( perpendicular)) polarization. The measurements are based on 190 B0 and 40 B(0)(s) candidates obtained from 89 pb(-1) of &pmacr;p collisions at the Fermilab Tevatron. The longitudinal decay amplitude dominates with |A0|(2) = 0.59+/-0. 06+/-0.01 for B0 and |A0|(2) = 0.61+/-0.14+/-0.02 for B(0)(s) decays. The parity-odd amplitude is found to be small with |A( perpendicular)|(2) = 0.13(+0.12)(-0.09)+/-0.06 for B0 and |A( perpendicular)|(2) = 0.23+/-0.19+/-0.04 for B(0)(s) decays.

We have searched for direct production of scalar top quarks at the Collider Detector at Fermilab in 88 pb-1 of p anti-p collisions at s**(1/2) = 1.8 TeV. We assume the scalar top quark decays into either a bottom quark and a chargino or a bottom quark, a lepton, and a scalar neutrino. The event signature for both decay scenarios is a lepton, missing transverse energy, and at least two b-quark jets. For a chargino mass of 90 GeV/c2 and scalar neutrino masses of at least 40 GeV/c2, we find no evidence for scalar top production and present upper limits on the production cross section in both decay scenarios.

The physics program at the Fermilab Tevatron Collider will continue to explore the high energy frontier of particle physics until the commissioning of the LHC at CERN.The luminosity increase provided by the Main Injector will require upgrades beyond those implemented for the first stage (Run IIa) of the Tevatron's Run II physics program.The upgrade of the CDF calorimetry includes: 1) the replacement of the slow gas detectors on the front face of the Central Calorimeter with a faster scintillator version which has a better segmentation, and 2) the addition of timing information to both the Central and EndPlug Electromagnetic Calorimeters to filter out cosmic ray and beam related backgrounds.

This Letter describes a direct measurement of the W boson total decay width, gamma(W), using the Collider Detector at Fermilab. The measurement uses an integrated luminosity of 90 pb(-1), collected during the 1994-1995 run of the Fermilab Tevatron p&pmacr; collider. The width is determined by normalizing predicted signal and background distributions to 49 844 W-->enu candidates and 21 806 W-->&mgr;nu candidates in the transverse-mass region M(T)<200 GeV and then fitting the predicted shape to the 438 electron events and 196 muon events in the high- M(T) region, 100<M(T)<200 GeV. The result is gamma(W) = 2.04+/-0.11(stat)+/-0.09(syst) GeV.

A Time-of-Flight (TOF) detector, based on plastic scintillator and fine-mesh photomultiplier tubes, has been added to the CDF-II experiment. Since August 2001, the TOF system has been fully instrumented and integrated into the CDF-II data acquisition system. The TOF system will provide particle identification of low momentum charged pions, kaons and protons in pp̄ collisions. With a design resolution goal of about 100ps, separation between charged kaons and pions is expected at the 2 sigma level for momenta below 1.6GeV/c, which enhances CDF's b-flavor tagging capabilities. We describe the design of the TOF detector and discuss its on-line and off-line calibration. Some performance benchmarks using proton–antiproton collision data are presented.

Abstract The CDF II detector contains a time-of-flight detector consisting of 216 scintillator bars of 279 cm length and 4×4 cm2 cross-section located at a radius of 138 cm from the beam axis. The bars are installed on the inner surface of the CDF solenoid, which produces an axial field of 1.4 T. Nineteen-stage fine-mesh photomultiplier tubes are attached at both ends of the scintillator bars. Photostatistics limit the time-of-flight resolution, which is expected to be 100 ps. The primary physics motivation is K± identification for improved neutral B meson flavor determination.

A Time-of-Flight detector (TOF) has been incorporated into the CDF-II experiment in order to provide charged kaon identification to improve neutral B meson flavor determination. With an expected time-of-flight resolution of 100 ps, the system will be able to provide 2 standard deviation separation between K± and π± for momenta p < 1.6 GeV/c, complementing the specific ionization energy loss dE/dx measured with the new drift chamber.

This paper reports on a test time-of-flight (TOF) system that operated in the Collider Detector at Fermilab (CDF) during pp̄ Tevatron collider operation at s=1.8 TeV in the fall 1995 running period. The TOF system consisted of 20 130×4×4cm3 long Bicron BC408 scintillator bars, with each end of the bars fitted with a small compound parabolic concentrator and a 16-stage R5946 Hamamatsu fine-mesh photomultiplier. The electronics chain consisted of a custom designed preamplifier, constant fraction discriminator, and commercial TDC and ADC FASTBUS modules read out with the CDF data acquisition system. The counters were installed between the Central Tracking Chamber and the 1.4 T superconducting solenoid at a mean radius of 140 cm. We report a procedure for calculating the t0 time from all tracks in an event, the timing resolution, and the particle identification performance of this system.

A Time-of-Flight detector (TOF), with a technique based on plastic scintillators and finemesh photomultipliers, has been added to the CDF-II experiment. The main physics motivation is to improve neutral B meson flavor determination by K ± identification. The expected time resolution is 100 ps, which provides at least two standard deviations separation between K ± and π ± for momenta p &lt; 1.6 Gev/cand better than 1.2 standard deviations separation over all momenta when combining TOF identification with dE/dx identification using the new drift chamber.

Yoshinobu Takaiwa∗1, Masako Bando2, Haruyoshi Gotoh3, Hisao Hayakawa4, Kohji Hirata5, Kazuyuki Ito6, Kenji Ito5, Kazuyuki Kanaya7, Daisuke Konagaya8, Michiji Konuma9, Taichiro Kugo10, Chusei Namba11, Tadashi Nishitani12, Masaharu Tanabashi13, Kio Tanaka14, Sho Tanaka15, Fumihiko Ukegawa7 and Tadashi Yoshikawa16 1Tsukuba University of Technology, Tsukuba 305-8521, Japan. 2Aichi University, Nagoya 453-8777, Japan. 3Kyoto University Museum, Kyoto University, Kyoto 606-8501, Japan. 4Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan. 5The Graduate University for Advanced Studies (Sokendai), Hayama 240-0193, Japan. 6Faculty of Literature, Kyoto University, Kyoto 606-8501, Japan. 7Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan. 8Faculty of Business Administration, Ryukoku University, Kyoto 612-8577, Japan. 9Yukawa Institute for Theorertical Physics, Kyoto University, Kyoto 606-8502, Japan and Keio University, Yokohama 223-8521, Japan. 10Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan. 11National Institute for Fusion Science, Toki 509-5292, Japan. 12Kikuchi College of Optometry, Nagoya 461-0001, Japan. 13Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, and Department of Physics, Nagoya University, Nagoya 464-8601, Japan. 14Faculty of Literature, Nara Women’s University, Nara 630-8506, Japan. 15Kyoto University, Kyoto 606-8501, Japan. 16Nagoya Women’s University, Nagoya 467-8507, Japan

originally in Japanese): We have analyzed scattering of neutron by proton using Heisenberg’s theory on nuclear structure, assuming the shape of interactions between neutron and proton, and taking into account the mass defect of hydrogen 2. Our result has been compared with experimental results. 2.2 Tomonaga told Yukawa on details of their analysis on nuclear interaction Responding to Yukawa’s request, Tomonaga wrote a letter of 7 pages to Yukawa explaining details of his analysis on the scattering of neutron by proton assuming various shapes of phenomenological short-range potential including present-day’s Yukawa potential in May or June of 1933 [9]. In page 3 of this letter Tomonaga wrote that “in the case of J(r) =A e -λr /r, we gave a report in the Sendai Meeting of the Physico-Mathematical Society of Japan in April 1933” as shown in Fig.1 [10]. 2.3 Yukawa acknowledged Tomonaga in his first article on meson theory Yukawa’s first article on meson theory was written in November 1934 (Fig.2) and published in the beginning of 1935 [11,12]. He wrote in this article that “we can calculate the mass defect of H 2 and the probability of scattering of a neutron by a proton ...”, “These calculations were made previously, according to the theory of ■■■ 013009-2 JPS Conf. Proc. , 013009 (2014) 1

A Time-of-Flight detector (TOF) has been added to the CDF-II experiment to provide charged kaon identification primarily for neutral B meson flavor determination. With its expected 100 ps time-of-flight resolution, the TOF system will be able to provide at least two standard deviation separation between K/sup /spl plusmn// and /spl pi//sup /spl plusmn// for momenta p < 1.6 GeV/c, complementing the specific ionization energy loss, dE/dx, measured in the new drift chamber. This paper describes the TOF detector and reports on the initial performance based on the data collected by the CDF-II so far.

Hideki Yukawa, Sin-itiro Tomonaga and Shoichi Sakata pioneered nuclear and particle physics and left enduring legacies. Their friendly collaboration and severe competition laid the foundation to bring up the active postwar generation of nuclear and particle physicists in Japan. In this presentation we illustrate milestones of nuclear and particle physics in Japan from 1930's to mid-1940's which have been clarified in Yukawa Hall Archival Library, Tomonaga Memorial Room and Sakata Memorial Archival Library.

The Tevatron Run-II program has been in progress since 2001, and the CDF and D0 experiments have been operational with upgraded detectors. Coupled with recent improvements in the Tevatron accelerator performance, the experiments have started producing important physics results and measurements. They report these measurements as well as prospects in the near future.

The Tevatron Run-II program has been in progress since 2001, and the CDF and D0 experiments have been operational with upgraded detectors. Coupled with recent improvements in the Tevatron accelerator performance, the experiments have started producing important physics results and measurements. We report these measurements as well as prospects in the near future.

The Tevatron Run-II program has been in progress since 2001, and the CDF and D0 experiments have been operational with upgraded detectors. Coupled with recent improvements in the Tevatron accelerator performance, the experiments have started producing important physics results and measurements. We report these measurements as well as prospects in the near future.

A new Time of Flight (TOF) detector based on scintillator bars with fine-mesh photomultipliers at both ends has been in operation since 2001 in the CDF experiment. With a design resolution of 100 ps, the TOF can provide separation between K/sup /spl plusmn// and /spl pi//sup /spl plusmn// in pp~ collisions at the 2/spl sigma/ level for low momentum, which enhances b flavor tagging capabilities. Because of its very fast response, the TOF is an excellent triggering device, and it is used to trigger on highly ionizing particles, multiple minimum ionizing particles and cosmic rays. Particle identification is achieved by comparing the time-of-flight of the particle measured by the TOF to the time expected for a given mass hypothesis. In order to obtain the resolution necessary for particle ID, optimal calibrations are critical. This paper describes the TOF detector, its calibration procedure, the achieved resolution, the long term operation performances and some of the first results from data analysis using this detector.

We review recent experimental results on spectroscopy and lifetime of bottom and charm hadrons.

We review results from CLEO, LEP and the Tevatron experiments on rare decays of B hadrons to final states including charged leptons.

semileptonic {Lambda}{sub b} {r_arrow} l{sup {minus}}{Lambda}{sub c}{sup {plus}}X decays, with {Lambda}{sub c}{sup {plus}} reconstructed from its decay to the pK{sup {minus}}{pi}{sup {plus}} final state. Using the same decay channels, the product branching ratios were measured to be f(b {r_arrow} {Lambda}{sub b})B({Lambda}{sub b} {r_arrow} {Lambda}J/{psi}) = 4.2{plus_minus}1.8(stat.){plus_minus}0.7(syst. ){times}10{sup {minus}5} and f(b {r_arrow} {Lambda}{sub b})B({Lambda}{sub b} {r_arrow} l{sup {minus}}{Lambda}{sub c}{sup {plus}}{ovr {nu}})B({Lambda}{sub c}{sup {plus}} {r_arrow} pK{sup {minus}}{pi}{sup {plus}}) {equals} 9.3{plus_minus}2.5(stat. ){plus_minus}{sup {plus}4.6}{sub {minus}4.0}(syst.){times}10{sup {minus}4}, where f(b {r_arrow} {Lambda}{sub b}) is the fraction of b quarks forming b baryons, and l is either an electron or a muon. 15 refs., 4 figs., 1 tab.

We have studied the production of the inclusive electrons and the bottom quark in proton-antiproton collisions at a center-of-mass energy of 1.8 Te V. In the QCD-improved parton model, the production of heavy quarks in hadron collisions is described in terms of the parton-parton hard scattering cross sections, proton structure functions and the coupling constant of the strong interactions. Recent calculations of the heavy quark production cross sections in the next-to-leading order show that the correction to the lowest order is large. The analysis presented here is the first measurement of the bottom quark production at the Tevatron energy, and thus provides a good testing ground for the above picture.