V. Gavrilov

Models of baryon structure predict a small quadrupole deformation of the nucleon due to residual tensor forces between quarks or distortions from the pion cloud. Sensitivity to quark versus pion degrees of freedom occurs through the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the gamma*p-->Delta(+)-->p pi(0) transition. We report new experimental values for the ratios E(1+)/M(1+) and S(1+)/M(1+) over the range Q2 = 0.4-1.8 GeV2, extracted from precision p(e,e(')p)pi(0) data using a truncated multipole expansion. Results are best described by recent unitary models in which the pion cloud plays a dominant role.

We describe the design, construction and performance of the upgraded DO muon system for Run II of the Fermilab Tevatron collider. Significant improvements have been made to the major subsystems of the DO muon detector: trigger scintillation counters, tracking detectors, and electronics. The Run II central muon detector has a new scintillation counter system inside the iron toroid and an improved scintillation counter system outside the iron toroid. In the forward region, new scintillation counter and tracking systems have been installed. Extensive shielding has been added in the forward region. A large fraction of the muon system electronics is also new.

We report on the test beam results and calibration methods using high energy electrons, pions and muons with the CMS forward calorimeter (HF). The HF calorimeter covers a large pseudorapidity region ( $3\leq|\eta|\leq5$ ), and is essential for a large number of physics channels with missing transverse energy. It is also expected to play a prominent role in the measurement of forward tagging jets in weak boson fusion channels in Higgs production. The HF calorimeter is based on steel absorber with embedded fused-silica-core optical fibers where Cherenkov radiation forms the basis of signal generation. Thus, the detector is essentially sensitive only to the electromagnetic shower core and is highly non-compensating (e/h≈5). This feature is also manifest in narrow and relatively short showers compared to similar calorimeters based on ionization. The choice of fused-silica optical fibers as active material is dictated by its exceptional radiation hardness. The electromagnetic energy resolution is dominated by photoelectron statistics and can be expressed in the customary form as $\frac{a}{\sqrt{E}}\oplus{b}$ . The stochastic term a is 198% and the constant term b is 9%. The hadronic energy resolution is largely determined by the fluctuations in the neutral pion production in showers, and when it is expressed as in the electromagnetic case, a = 280% and b = 11%.

The CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab utilizes six iron-free superconducting coils to provide an approximately toroidal magnetic field. The six sectors are instrumented individually to form six independent spectrometers. The forward region (8°<θ<45°) of each sector is equipped with a lead–scintillator electromagnetic sampling calorimeter (EC), 16 radiation lengths thick, using a novel triangular geometry with stereo readout. With its good energy and position resolution, the EC is used to provide the primary electron trigger for CLAS. It is also used to reject pions, reconstruct π° and η decays and detect neutrons. This paper treats the design, construction and performance of the calorimeter.

Extensive measurements have been made with pions, electrons and muons on four production wedges of the compact muon solenoid (CMS) hadron barrel (HB) calorimeter in the H2 beam line at CERN with particle momenta varying from 20 to 300 GeV/c. The time structure of the events was measured with the full chain of preproduction front-end electronics running at 34 MHz. Moving-wire radioactive source data were also collected for all scintillator layers in the HB. The energy dependent time slewing effect was measured and tuned for optimal performance.

We present the results of beam tests with high-energy (8–375 GeV) electrons, pions, protons and muons of a sampling calorimeter based on the detection of Cherenkov light produced by shower particles. The detector, a prototype for the very forward calorimeters in the CMS experiment, consists of thin quartz fibers embedded in a copper matrix. Results are given on the light yield of this device, on its energy resolution for electron and hadron detection, and on the signal uniformity and linearity. The signal generation mechanism gives this type of detector unique properties, especially for the detection of hadron showers: narrow, shallow shower profiles and extremely fast signals. These specific properties were measured in detail. The implications for measurements in the high-rate, high-radiation Large Hadron Collider (LHC) environment are discussed.

We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer $[{Q}^{2}=0.27--1.3(\mathrm{GeV}{/c)}^{2}]$ and final hadronic state mass in the nucleon resonance region $(W=1.08--2.0\mathrm{GeV}).$ We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target ${(}^{15}{\mathrm{ND}}_{3})$ and detected the scattered electrons with the CEBAF large acceptance spectrometer. From our data, we extract the longitudinal double spin asymmetry ${A}_{||}$ and the spin structure function ${g}_{1}^{d}.$ Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function ${g}_{1}^{d}$ and study its approach to both the deep inelastic limit at large ${Q}^{2}$ and to the Gerasimov-Drell-Hearn sum rule at the real photon limit ${(Q}^{2}\ensuremath{\rightarrow}0).$ We find that the first moment varies rapidly in the ${Q}^{2}$ range of our experiment and crosses zero at ${Q}^{2}$ between 0.5 and $0.8(\mathrm{GeV}{/c)}^{2},$ indicating the importance of the $\ensuremath{\Delta}$ resonance at these momentum transfers.

We present measurements of the reduction of light output by plastic scintillators irradiated in the CMS detector during the 8 TeV run of the Large Hadron Collider and show that they indicate a strong dose rate effect. The damage for a given dose is larger for lower dose rate exposures. The results agree with previous measurements of dose rate effects, but are stronger due to the very low dose rates probed. We show that the scaling with dose rate is consistent with that expected from diffusion effects.

We present the results of experimental studies of hadron showers in a copper/quartz-fiber calorimeter, based on the detection of Cherenkov light. These studies show that there are very significant differences between the signals from protons and pions at the same energies. In the energy range between 200 and 375 GeV, where these studies were performed, the calorimeter's response to protons was typically 10% smaller than the response to pions. On the other hand, the energy resolution was about 25% better for protons. In addition, the protons had a Gaussian line shape, whereas the pion response curve was asymmetric. These differences can be understood from the requirements of baryon number conservation in the shower development. They are expected to be present in any non-compensating calorimeter, to a degree determined by the e/h value.

The reaction $ep \to e'K^+\Lambda(1520)$ with $\Lambda(1520) \to p'K^-$ was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cos$\theta_{K^+}$, $\phi_{K^+}$, $Q^2$, and $W$ dependencies of $\Lambda$(1520) electroproduction are presented for the kinematic region 0.9 $<$ $Q^2$ $<$ 2.4 GeV$^2$ and 1.95 $<$ $W$ $<$ 2.65 GeV. Also, the $Q^2$ dependence of the $\Lambda$(1520) decay angular distribution is presented for the first time. The cos$\theta_{K^+}$ angular distributions suggest {\it t}-channel diagrams dominate the production process. Fits to the $\Lambda$(1520) {\it t}-channel helicity frame decay angular distributions indicate the $m_{z}=\pm{1/2}$ parentage accounts for about 60% of the total yield, which suggests this reaction has a significant contribution from {\it t}-channel processes with either K$^+$ exchange or longitudinal coupling to an exchanged K$^*$. The $Q^2$ dependence of the $\Lambda$(1520) production cross section is the same as that observed for $\Lambda$(1116) photo- and electroproduction.

Measurements of the angular distributions of target and double spin asymmetries for the Delta(1232) in the exclusive channel (polarized-p polarized-e,e-prime p)pi0 obtained at Jefferson Lab in the Q2 range from 0.5 to 1.5 gev2 are presented. Results of the asymmetries are compared with the unitary isobar model, dynamical models, and the effective Lagrangian theory. Sensitivity to the different models was observed, particularly in relation to the description of background terms on which the target asymmetry depends significantly.

The Outer Hadron Calorimeter (HCAL HO) of the CMS detector is designed to measure the energy that is not contained by the barrel (HCAL HB) and electromagnetic (ECAL EB) calorimeters. Due to space limitation the barrel calorimeters do not contain completely the hadronic shower and an outer calorimeter (HO) was designed, constructed and inserted in the muon system of CMS to measure the energy leakage. Testing and calibration of the HO was carried out in a 300 GeV/c test beam that improved the linearity and resolution. HO will provide a net improvement in missing E T measurements at LHC energies. Information from HO will also be used for the muon trigger in CMS.

Abstract Forward dijet production with wide rapidity separation in pp -collisions at LHC and Tevatron energies is discussed. Predictions on forward dijet ratios and azimuthal decorrelations from various GLAPD- and BFKL- Monte-Carlo event generators are presented.

Abstract Calorimeters based on silicon core fibres embedded into an absorber have been simulated by combining the GEANT 3.16 package and a proprietary routine describing Cherenkov photon production in optical fibres. The good agreement between simulation results and experimental data allows to study, with a high degree of confidence, the design of a prototype hadronic detector and of different calorimeter configurations to cover the very forward regions of an LHC experiment.

Correlations between neutrons with small relative momenta have been studied in p-Pb interactions at 7.5 GeV/c. Two-neutron final-state interaction effects carrying information about spacetime characteristics of a neutron source have been observed. The source lifetime has been found to decrease with increasing mean neutron kinetic energy. This fact is explained by the considerable contribution of the evaporation process to the emission of slow secondaries.

The PMTs of the CMS Hadron Forward calorimeter were found to generate a large size signal when their windows were traversed by energetic charged particles. This signal, which is due to Čerenkov light production at the PMT window, could interfere with the calorimeter signal and mislead the measurements. In order to find a viable solution to this problem, the response of four different types of PMTs to muons traversing their windows at different orientations is measured at the H2 beam-line at CERN. Certain kinds of PMTs with thinner windows show significantly lower response to direct muon incidence. For the four anode PMT, a simple and powerful algorithm to identify such events and recover the PMT signal using the signals of the quadrants without window hits is also presented. For the measurement of PMT responses to Čerenkov light, the Hadron Forward calorimeter signal was mimicked by two different setups in electron beams and the PMT performances were compared with each other. Superior performance of particular PMTs was observed.

Multiple proton and pion electroproduction from nuclei are studied. Final states including at least two protons produced by the interaction of 14.5 GeV electrons and positrons with light nuclei (mainly $^{12}\mathrm{C}$ and $^{16}\mathrm{O}$) have been measured, and compared with analogous data from $^{40}\mathrm{Ar}$. Scattered electrons and positrons were detected in the energy transfer range from 0.2 to 12.5 GeV, and four-momentum transfer squared range from 0.1 to 5.0 ${\mathrm{GeV}}^{2}$/${\mathit{c}}^{2}$. Phenomenological characteristics of the secondary hadron production cross sections such as temperature and velocity of the effective source of hadrons were found to be dependent on energy transfer to the nucleus and independent on the four-momentum transfer squared at energy transfers greater than 2 GeV.

Results on the light output of different kinds of silica fibres and on energy resolution and electromagnetic shower dimensions in small lead/quartz fibres calorimeter prototypes are presented, together with a possible design of a very forward calorimeter for LHC.

The first pre-production-prototype (PPP-I) of the quartz fibre calorimeter of the CMS detector has been tested at CERN. The calorimeter consists of quartz fibres embedded in an iron matrix. Results are presented on the energy resolution and on the signal uniformity of the prototype for electrons and pions and the signal uniformity and linearity.

A small quartz fiber calorimeter prototype with copper absorber has been assembled and tested at ITEP as a first test of a “0 degree” component of the RD-40 R&D program. Calibration and monitoring of each tower response was performed using the positions of single photoelectron peaks as well as the response to minimum ionizing particles incident at an angle of 45°. The response of the prototype to 4 GeV electrons as a function of beam angle with respect to the quartz fibers was studied in the range from 0° to 90°. The test results are compared to the GEANT based Monte Carlo (MC) simulations.

The experiments at the Large Hadron Collider (LHC) will have to deal with unprecedented radiation levels. In the large-rapidity regions, close to the beam pipe, these levels reach megagrays per year. The detectors to be installed in these regions, the HF Calorimeters, are designed to operate under these conditions. In this paper, we describe the results of studies in which a prototype calorimeter was exposed to radiation of the type and intensity expected at the LHC. These studies made it possible to estimate the effects of this radiation on the response and the resolution of the calorimeter as a function of time during LHC operation.

Monte Carlo event simulation with BFKL evolution is discussed. We report current status of a Monte Carlo event generator ULYSSES with BFKL evolution implemented. The ULYSSES, based on Pythia Monte Carlo generator, would help to reveal BFKL effects at LHC energies. In particular, such an observable as dijet K-factor can serve as a source of BFKL dynamics at the LHC, and it would also help to search for new physics.

Abstract The CMS will be a general purpose detector for the Large Hadron Collider at CERN. Its quartz fiber calorimeter is designed to provide hermetic measurement of energy flow in the forward rapidity region. The calorimeter must operate under extremely hard radiation conditions and almost without maintenance. Several prototypes have been constructed and tested at the CERN high-energy beam. The cost effective technology of manufacturing of fine sampling absorber modules has been developed.

Beam-gas events taken with the ARGUS detector at thee + e −-storage ring DORIS-II have been used to study interactions ofe ± at 5 GeV with light nuclei mainly16O. The selection ofe ± 16O events is discussed. The spectra of secondary protons and charged pions are found to be similar to those of hA interactions in accordance with the nuclear scaling. Measurements of like-particle (p p andπ π) correlations at small relative momenta were used to determine the radius of particle emission region ine ± 16O interactions. This radius proved to be equal within errors to the radius of particle emission region in hC interactions. No any narrow diproton resonance has been observed in the mass region from 1.9 to 2.2 GeV.

The sensitivity of the jet transverse structure to the hadronization models (cluster and string hadronization models), expected for 10 pb-1 of integrated luminosity with the compact muon solenoid experiment at the large hadron collider, is determined. A new variable is developed and employed for this purpose: the second moment of the jet profile in the transverse momentum, which is calculated using particle tracks.

A calorimeter with optical quartz fibers embedded into an absorber matrix was proposed for the small angle region of the CMS detector at LHC (CERN). This type of calorimeter is expected to be radiation hard and to produce extremely fast signal. Some results from beam tests of the quartz fiber calorimeter prototype are presented.

We study the light output, light collection efficiency and signal timing of a variety of organic scintillators that are being considered for the upgrade of the hadronic calorimeter of the CMS detector. The experimental data are collected at the H2 test-beam area at CERN, using a 150 GeV muon beam. In particular, we investigate the usage of over-doped and green-emitting plastic scintillators, two solutions that have not been extensively considered. We present a study of the energy distribution in plastic-scintillator tiles, the hit efficiency as a function of the hit position, and a study of the signal timing for blue and green scintillators.

The synchronization and timing of the hadron calorimeter (HCAL) for the Compact Muon Solenoid has been extensively studied with test beams at CERN during the period 2003-4, including runs with 40 MHz structured beam. The relative phases of the signals from different calorimeter segments are timed to 1 ns accuracy using a laser and equalized using programmable delay settings in the front-end electronics. The beam was used to verify the timing and to map out the entire range of pulse shapes over the 25 ns interval between beam crossings. These data were used to make detailed measurements of energy-dependent time slewing effects and to tune the electronics for optimal performance.

CMS very forward calorimeter is based on a quartz fibre technology. The calorimeter prototype composed of two longitudinal segments was tested at CERN in 1996. We present the test beam data analysis of this prototype. It was shown that the mean values of responses for pions and electrons of the same energy could be equalised using the appropriate ratio of calibration constants for longitudinal segments. The beam test data were used to simulate the calorimeter response to hadron jets.

We present test-beam data analysis of a quartzfibre calorimeter prototype composed of a single active section with a passive absorber in front of it. The partial suppression of the electromagnetic showers leads to the equalization of the response to electrons and pions for a given depth of this passive section. Results are compared with the Monte-Carlo expectations.

The Compact Muon Solenoid (CMS) is a high-performance general-purpose detector at the Large Hadron Collider (LHC) at CERN.More than twenty institutes from Russia and Joint Institute for Nuclear Research (JINR) are involved in Russia and Dubna Member States (RDMS) CMS Collaboration.A proper computing grid-infrastructure has been constructed at the RDMS institutes for the participation in the running phase of the CMS experiment.Current status of RDMS CMS computing and plans of its development to the next LHC start in 2015 are presented.

The response of a 20 cm thick plastic scintillator detector to p, d, t and 3He ions has been measured as a function of the energy of the ions from several tens to several hundreds of MeV. It was observed that in this energy region the specific luminescence depends not only on ionization loss but also on the charge of the ion. A simple expression can be used for the approximation of the specific luminescence of light ions with energies from about 1 MeV up to several hundreds of MeV.

Nucleon resonances beyond the \ensuremath{\Delta}(1232) have been observed in complex nuclei. Measurements of the (e,${\mathit{e}}^{\mathcal{'}}$p${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$) reaction, at an incident energy of 14.5 GeV with 1.1 GeV W2.0 GeV and 〈${\mathit{Q}}^{2}$〉\ensuremath{\approxeq}0.35 ${\mathrm{GeV}}^{2}$/${\mathit{c}}^{2}$, are presented for $^{2}\mathrm{H}$, CO, Ar, and Xe targets. These exclusive data show no shift in the \ensuremath{\Delta}(1232) mass and give evidence for excitations in the region of the ${\mathit{D}}_{13}$(1520) and ${\mathit{F}}_{15}$(1680) resonances. The pion angular distribution in the \ensuremath{\Delta} region is suppressed at forward angles relative to distorted-wave impulse approximation predictions.

The Phase I upgrade of the CMS Hadron Endcap Calorimeters consists of new photodetectors (Silicon Photomultipliers in place of Hybrid Photo-Diodes) and front-end electronics. The upgrade will eliminate the noise and the calibration drift of the Hybrid Photo-Diodes and enable the mitigation of the radiation damage of the scintillators and the wavelength shifting fibers with a larger spectral acceptance of the Silicon Photomultipliers. The upgrade also includes increased longitudinal segmentation of the calorimeter readout, which allows pile-up mitigation and recalibration due to depth-dependent radiation damage. As a realistic operational test, the responses of the Hadron Endcap Calorimeter wedges were calibrated with a 60Co radioactive source with upgrade electronics. The test successfully established the procedure for future source calibrations of the Hadron Endcap Calorimeters. Here we describe the instrumentation details and the operational experiences related to the sourcing test.

Monte Carlo event simulation with BFKL evolution is discussed. We report current status of a Monte Carlo event generator ULYSSES with BFKL evolution implemented. The ULYSSES, based on Pythia Monte Carlo generator, would help to reveal BFKL effects at LHC energies. In particular, such an observable as dijet K-factor can serve as a source of BFKL dynamics at the LHC, and it would also help to search for new physics.

Мастер-класс ВЫБОР СТРАТЕГИИ НАЧАЛЬНОЙ ШКОЛЫ В УСЛОВИЯХ ВЫСОКОЙ НЕВРОТИЗАЦИИ ГОРОДСКИХ ДЕТЕЙ Частная школа Кукувайя, Москва, Россия Руководители -Мудрова Евгения Борисовна, Святловская Евгения Александровна (в рамках секции 3 "Мышление и сознание") Королёва А.В.ВЫБОР СТРАТЕГИИ НАЧАЛЬНОЙ ШКОЛЫ В УСЛОВИЯХ ВЫСОКОЙ НЕВРОТИЗАЦИИ ГОРОДСКИХ ДЕТЕЙ ВЗГЛЯД ОСТЕОПАТА.КОГДА НАБЛЮДЕНИЕ И ПОМОЩЬ ВРАЧА-ОСТЕОПАТА СТАНОВИТСЯ НЕОБХОДИМОЙ ЧАСТЬЮ УЧЕБНОГО ПРОЦЕССА.Korolyeva A.V. WHAT STRATEGY TO CHOOSE FOR PRIMARY SCHOOL

The contribution of the coalescence mechanism to deuteron production is discussed on the basis of data on inclusive deuteron and proton production in hadron-nucleus interactions. The angular dependence and theA dependence of the coefficient of twonucleon coalescence into a deuteron are analysed for 7.5 GeV/c pA and 5 GeV/cπ − A interactions. The results suggest an elongated shape of the interaction region along the trajectory of the incident hadron and a successive knock-out of nucleons during propagation of the incident particle through a nucleus.

Methods for determining the sensitivity of fluorescent probes and their classification with respect to sensitivity and specificity using human serum albumin as a reference protein and 8-anili-nonaphthalenesulfonate, K35 and pyron red as probes are proposed. The indicators of sensitivity and specificity of fluorescent probes as markers of the structural state of proteins are the activation of the probe fluorescence in excess of protein and the constant of its binding to the strong highly affine center of protein sorption. Fluorescent probes as markers of the binding ability are assessed by a protein-dependent increase in fluorescence under the conditions of excess probe and from the constant of its binding to weak secondary binding sites of the protein.

We report measurements of the cross sections for production of ..pi../sup -/ mesons on the nuclei Be, Al, Cu, Ag, Ta, and Au at an angle theta=62 mrad in bombardment by protons with momenta 3.95, 6.7, and 9.7 GeV/c. An analysis is made of the behavior of the functions f/sub A/(p/sub ..pi../) = (E/p/sup 2/) dsigma/dpd..cap omega.. and R/sub A/(p/sub ..pi../) =p/sub A/(p/sub ..pi../)/rho/sub Be/(p/sub ..pi../) (where rho/sub A/= (sigma/sup i n//sub p A/)-/sup 1/f/sub A/(p/sub ..pi../)) as a function of the pion momentum for various A. Cross sections for the reactions pAl..--> pi../sup -/..., represented in the form of a function f/sub Al/(x) where x=p/sub ..pi..//p/sub ..pi..//sub max/, are compared for different initial proton momenta.

This paper presents the first measurement of inclusive J/{psi} production cross section in the forward pseudorapidity region 2.5{le}{vert_bar}{eta}thinsp{sup J/{psi}}{vert_bar}{le}3.7 in p{ovr p} collisions at {radical} (s) =1.8 thinspthinspTeV. The results are based on 9.8 pb{sup {minus}1} of data collected using the D0 detector at the Fermilab Tevatron Collider. The inclusive J/{psi} cross section for transverse momenta between 1 and 16 GeV/c is compared with theoretical models of charmonium production. {copyright} {ital 1998} {ital The American Physical Society }

The reaction ..pi../sup -/A..-->..p/sub 1/p/sub 2/...pn+A'+ neutral particles has been studied in the nuclei C, Al, Cu, and Pb at a ..pi../sup -/-meson momentum of 3.7 GeV/c. It is shown that the spectra of protons emitted backwards in the lab in this reaction are similar to the inclusive spectra. Correlation of the protons has been studied. The shape of the proton spectrum at angles greater than 120/sup 0/ lab depends weakly on the total multiplicity of protons, the number of protons emitted backwards in the lab, and the momentum of the fast particles emitted forward. Indications are obtained that the size of the interaction region is of the order of the nuclear size.

We have made a precise measurement of the central inclusive jet cross section at {radical} (s) =1.8 TeV . The measurement is based on an integrated luminosity of 92 pb{sup {minus}1} collected at the Fermilab Tevatron {ovr p} p Collider with the D0 detector. The cross section, reported as a function of jet transverse energy (E{sub T} {ge} 60 GeV ) in the pseudorapidity interval {vert_bar} {eta} {vert_bar} {le} 0.5, is in good agreement with predictions from next-to-leading order quantum chromodynamics. {copyright} {ital 1999} {ital The American Physical Society}

We report a measurement of the top quark mass using six candidate events for the process p{bar p}{r_arrow}t{bar t}+X{r_arrow}l{sup +}{nu}bl{sup {minus}}{bar {nu}}{bar b}+X, observed in the D0 experiment at the Fermilab p{bar p} collider. Using maximum likelihood fits to the dynamics of the decays, we measure a mass for the top quark of m{sub t}=168.4{plus_minus}12.3(stat){plus_minus}3.6(syst) Gev. We combine this result with our previous measurement in the t{bar t}{r_arrow}l+jets channel to obtain m{sub t}=172.1{plus_minus}7.1 GeV as the best value of the mass of the top quark measured by D0. {copyright} {ital 1999} {ital The American Physical Society}

Inclusive spectra have been measured for neutrons emitted from nuclei bombarded by ..pi../sup -/ mesons with momentum 3 GeV/c. The secondary neutrons were detected in the interval of kinetic energies 25 < or approx. = T/sub n/ < or approx. = 160 MeV. Measurements were made on the nuclei C, Cu, Pb, and U in the angular range from 60 to 160/sup 0/ with 10/sup 0/ steps. At angles 90, 120, and 160/sup 0/ measurements were made for 12 nuclei from Be to U. It was found that the dependence of the neutron yield on the number of neutrons in the nucleus is similar to the dependence of the proton yield on the number of protons in the nucleus, but even for the isospin-symmetric carbon nucleus under the experimental conditions the yield of neutrons is greater than the yield of protons.

The differential cross sections for d knockout from Be, Al, Cu, and Au and for t knockout from Be by protons with a momentum of 2.14 GeV/c at an angle of 62 mrad have been measured at momenta higher than the primary momentum. The differential cross sections for quasifree reactions are determined.

DO/ has measured the inclusive production cross section of [ital W] and [ital Z] bosons in a sample of 13 pb[sup [minus]1] of data collected at the Fermilab Tevatron. The cross sections, multiplied by their leptonic branching fractions, for production in p[bar p] collisions at [radical] (s) =1.8 TeV are [sigma][sub W] B(W[r arrow]e [nu])=2.36 [plus minus] 0.02 [plus minus] 0.08 [plus minus] 0.13nb, [sigma] [sub W] B(W[r arrow][mu][nu])=2.09 [plus minus] 0.06 [plus minus] 0.22 [plus minus] 0.11nb, [sigma] [sub Z] B(Z[r arrow]e [sup +] e [sup [minus]])=0.218[plus minus] 0.008 [plus minus] 0.008 [plus minus] 0.012nb, and [sigma] [sub Z] B(Z[r arrow][mu] [sup +] [mu] [sup [minus]])=0.178 [plus minus] 0.022 [plus minus] 0.021[plus minus] 0.009nb, where the first uncertainty is statistical and the second systematic; the third reflects the uncertainty in the integrated luminosity. For the combined electron and muon analyses, we find [sigma] [sub W] B(W[r arrow] l [nu])/[sigma] [sub Z] B(Z[r arrow]l [sup +]l [sup [minus]])=10.90 [plus minus] 0.52. Assuming standard model couplings, we use this result to determine the width of the [ital W] boson, and obtain [Gamma] (W)=2.044 [plus minus] 0.097 GeV. [copyright] [ital 1999] [ital The American Physical Society]

Experimental data are reported on inclusive ..pi../sup -/ production at an angle of 62 mrad in the laboratory frame in proton--nucleus interactions at proton momenta of 3.95, 6.7, 8.8, and 9.7 GeV/c and on the inclusive production of ..pi../sup -/ mesons and protons at an angle of 188 mrad in proton--nucleus interactions at 9 GeV/c. The possibility of determining the cross sections for the interaction of ''young'' pions with the nucleons of the nucleus from the inclusive data is analyzed.

So called tagging jets and pile-up were simulated for the optimisation of the HF segmentation. The energy resolution, angular resolution and efficiency of jet reconstruction are defined for different calorimeter segmentation.

Hadron correlations are investigated in reactions in which 6.0-GeV/c ..pi../sup -/ mesons produce backward-emitted (in the l.s.) protons from Be, C, Al, Cu, Cd, Pb, and U nuclei. The investigated correlations point to an important role of multiple interactions of the incident particles in cumulative-proton production.

A search has been carried out for events in the channel p{ovr p}{r_arrow}{gamma}{gamma}+2 jets . Such a signature can characterize the production of a nonstandard Higgs boson together with a W or Z boson. We refer to this nonstandard Higgs, having standard model couplings to vector bosons but no coupling to fermions, as a {open_quotes}bosonic Higgs.{close_quotes} With the requirement of two high transverse energy photons and two jets, the diphoton mass (m{sub {gamma}{gamma}}) distribution is consistent with expected background. A 90 (95){percent} confidence level (C.L.) upper limit on the cross section as a function of mass is calculated, ranging from 0.60 (0.80)thinspthinsppb for m{sub {gamma}{gamma}}=65 GeV/c{sup 2} to 0.26 (0.34)thinspthinsppb for m{sub {gamma}{gamma}}=150 GeV/c{sup 2} , corresponding to a 95{percent} thinspthinspC.L. lower limit on the mass of a bosonic Higgs of 78.5 GeV/c{sup 2} . {copyright} {ital 1999} {ital The American Physical Society}

Using the D0 detector at the 1.8 TeV{ovr p} p Fermilab Tevatron collider, we have measured the inclusive dijet mass spectrum in the central pseudorapidity region {vert_bar} {eta} {sub jet} {vert_bar} {lt}1.0 for dijet masses greater than 200 GeV/c{sup 2} . We have also measured the ratio of spectra {sigma} ({vert_bar} {eta} {sub jet} {vert_bar} {lt} 0.5)/ {sigma} (0.5{lt} {vert_bar} {eta} {sub jet } {vert_bar} {lt}1.0). The order {alpha} {sup 3} {sub s} quantum chromodynamics predictions are in good agreement with the data and we rule out models of quark compositeness with a contact interaction scale {lt} {number_sign} {number_sign}2.4 TeV at the 95{percent} confidence level. {copyright} {ital 1999} {ital The American Physical Society}

The inclusive angular distributions for deep inelastic nuclear reactions are compared with the predictions of various models. A simple unified parametrization is proposed for all the invariant inclusive cross sections which have been studied.

Correlations of cumulative baryons emitted from nuclei of Al, Cu, and Pb with small relative momenta are investigated. The nuclei were bombarded by protons with momentum 8.3 GeV/c. The secondary particles were recorded at angles 110--160/sup 0/ lab and had momenta 0.32--0.90 GeV/c. Information was obtained on the space-time characteristics of the region from which the cumulative particles are emitted.

Yields of protons and neutrons from Be, C, Al, and Pb nuclei have been measured for an angle of 90/sup 0/, under bombardment by ..pi../sup -/ mesons with momenta 1.2--5.0 GeV/c. The regularities of the approach to limiting fragmentation of the nuclei are presented and discussed.

Multiple production of hadrons in pA and ..pi../sup -/A interactions has been studied for the nuclei Be, C, Al, Cu, Cd, Pb, and U at momentum 7 GeV/c. Data are given on the differential multiplicities of protons and ..pi../sup -/ mesons, the topological cross sections, and two-particle correlations. The results are interpreted qualitatively in terms of fragmentation of the incident particle and target nucleus.

The correlations between identical ..pi../sup -/ mesons produced in the reactions ..pi../sup -/A..--> pi../sup -/..pi../sup -/..pi../sup +/(p)+X (A is a nucleus of Al, Cu, or Pb) have been studied at an incident ..pi../sup -/ momentum of 3.7 GeV/c. The space--time characteristics of the interaction region, i.e., the characteristic dimensions and lifetime of the excited region which emits the ..pi../sup -/ mesons, have been determined.

Data on the pion yields (with ..beta..>0.7) from nuclei under the action of protons and ..pi../sup + -/-mesons with momenta from 1 to 9 GeV/c are reported and discussed. The dependences of the pion production cross sections on the emission angle, atomic number of the target nucleus, and incident-particle momentum are in many respects similar to those for nucleon-production cross sections. At the incident-particle momenta p/sub 0/> or =4GeV/c the ratio of pion and nucleon yields is independent of the momentum and type of the incident hadron, although such a dependence is present for the yields themselves.

Contributions from the secondary pickup and coalescence (fusion) processes to production of deuterons on heavy and intermediate nuclei are extracted on the basis of detailed experimental data on cross sections of the reactions hA..-->..dx and hA..-->..NX. Dependences of the secondary pickup and coalescence probabilities on various variables are discussed. On the basis of the angle and mass-number dependences and the two-nucleon--deuteron coalescence coefficient, information is obtained on the space-time structure and the size of the nucleon emission region in deep inelastic nuclear reactions.

We report and discuss the yields and spectra of photons with energies from 90 to 230 MeV and of neutrons with energies from 8 to 190 MeV as functions of the mass number A (Be, C, Al, Ti, Fe, Cu, Nb, Cd, Sn, Ta, Pb, and U) of the target nucleus and of the momentum of incident protons (1.0--9.0 GeV/c), ..pi../sup +/ mesons (1.0--6.0 GeV/c), and ..pi../sup -/ mesons (1.4--5.0 GeV/c).