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in subjects: "Quarkonium"

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Topics in nuclear chromodynamics: Color transparency and hadronization in the nucleus

The nucleus plays two complimentary roles in quantum chromodynamics: (1) A nuclear target can be used as a control medium or background field to modify or probe quark and gluon subprocesses. Some novel examples are color transparency, the predicted transparency of the nucleus to hadrons participating in high momentum transfer exclusive reactions, and formation zone phenomena, the absence of hard, collinear, target-induced radiation by a quark or gluon interacting in a high momentum transfer inc… more

Date: March 1, 1988

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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J/. psi. and. psi. prime production with 800 GeV protons

The yields of J/{psi} and {psi}{prime} vector meson states have been measured for 800 GeV protons incident on deuterium, carbon, calcium, iron and tungsten targets. A depletion of the yield per nucleon from heavy nuclei is observed for both J/{psi} and {psi}{prime} production. This depletion exhibits a strong dependence on x{sub F} and p{sub t}. 24 refs., 3 figs.

Date: January 1, 1990

Creator: Moss, J.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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J/psi and UPSILON radiative and hadronic decays

The search for gluonium at the J/psi and UPSILON is discussed, as well as the search for exotics at the UPSILON. Reactions discussed include radiative and hadronic decays of the J/psi and the search for radiative decays of the UPSILON. Future perspectives are also briefly considered. 45 refs., 27 figs. (LEW)

Date: July 1, 1987

Creator: Bloom, E. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Large transverse momentum and higher twist phenomena

A brief summary of the physics of large transverse momentum and higher twist phenomena is given. Particle topics discussed are: higher twist effects in deep inelastic scattering; power suppressed effects at kinematic boundaries; heavy flavour production; vector boson production; and the running of the coupling constant. (LSP)

Date: November 1, 1988

Creator: Ellis, R.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Strangeness enhancement in 14. 6 A GeV/c Si+Au interactions

The questions of strangeness enhancement and of J/{psi} suppression have become central in the discussion of high energy heavy ion physics. Both phenomena have been predicted as signs of the formation of a deconfined quark-gluon phase of matter, both have been observed and both may be explainable also in terms of ordinary hadronic matter. In this note the question of K{sup +} and K{sup {minus}} enhancement will be discussed from a much less elevated point of view, namely as a question of enhanc… more

Date: January 1, 1990

Creator: Hansen, O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dilepton and dihadron production in proton-nucleus collisions at 800 GeV

A high statistics measurement of the atomic mass dependence of Drell-Yan, J/{psi}, {psi}{prime} and {Upsilon} production induced by 800 GeV protons on deuterium, carbon, calcium, iron and tungsten targets has been performed at FermiLab (E772). The data consist of about 700,000 muon pairs covering the mass region 3 GeV {le}M{mu}{mu} < 14 GeV. No nuclear modification is seen in the production of massive muon pairs in the Drell-Yan region for 0.1 < x{sub 2} < 0.3. The relative dimuon yield for fra… more

Date: May 1, 1990

Creator: Mishra, C. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theoretical studies in medium-energy nuclear and hadronic physics

In the period covered by this report (April 1, 1991 to March 31, 1992), work focused on six main areas: (1) Relativistic Theories of Nuclear Structure and Saturation, (2) Relativistic Descriptions of Proton-Nucleus and Electron-Nucleus Scattering, (3) Nonrelativistic Theory of Nucleon-Nucleus Reactions, (4) Relativistic Many-Body Theory at Finite Temperature and Density, (5) Neutrino Interactions in Dense Matter, (6) Quark Models of Nuclear and Quark Matter.

Date: December 3, 1991

Creator: Horowitz, Charles J.; Macfarlane, Malcolm H.; Matsui, Tetsuo & Serot, Brian D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Review of CERN heavy-ion physics

The primary motivation for studying nucleus-nucleus collisions at very high energies is the possibility of forming a quark-gluon plasma (QGP). In these collisions energy and baryon densities are expected to increase and reach critical values where the quark constituents of the incident nucleons, bound in nuclei, form an extended volume of freely interacting quarks, antiquarks and gluons. Various signatures of the existence of a quark-gluon plasma in these collisions have been proposed: suppress… more

Date: December 1, 1990

Creator: Harris, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High energy nucleus-nucleus collisions at CERN: Signatures, physical observables and experimental results

Experimental results on high energy nucleus-nucleus collisions have become available with the recent experiments at CERN utilizing 200 GeV/n oxygen and sulfur beams. Physics motivations for these experiments are presented: a description of predicted signatures for possible formation of a quark-gluon plasma and physical observables that are expected to provide important information for understanding the dynamics of these collisions. A presentation will be made of some of the first experimental r… more

Date: February 1, 1988

Creator: Harris, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The A dependence of dilepton production

The discovery in 1982, by the EMC group, that the structure function F{sub 2}(x) per nucleon is different in iron than deuterium was the first evidence that the structure of the nucleon might be altered in nuclei. Much more extensive and precise and data have been taken since the original discovery. This body of data is now quite consistent and many of the features of the original EMC effect'' remain intact. There have been a variety of theoretical explanations of the data, but none are totally… more

Date: January 1, 1990

Creator: Garvey, Gerald T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Relativistic heavy ions physics

Central nuclear collisions at energies far above 1 GeV/nucleon may provide for conditions, where the transition from highly excited hadronic matter into quark matter or quark-gluon plasma can be probed. We review current ideas about the nature of, and signals for, this transition, and we discuss the (hadronic) string model approach to the nuclear collisions dynamics. At even higher energies in the TeV/nucleon range peripheral nuclear collisions may become a laboratory for electroweak physics at… more

Date: January 1, 1989

Creator: Mueller, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Lepton-pair production in hadron-nucleus collisions

Physics motivations for precision measurements of lepton pair production in nuclei are discussed. Preliminary results from Fermilab Experiment E772 are presented. The relevance of these results to the EMC effect and to J/{psi} suppression in heavy ion collisions is also discussed. 34 refs., 17 figs.

Date: January 1, 1989

Creator: Moss, J. M.; Peng, J. C.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Charm and beauty physics at Fermilab

The status of charm and beauty physics studies at Fermilab is reviewed. Data from fixed target experiments on charm production, semi-leptonic decay, and Cabibbo suppressed decays as well as charmonium studies in antiproton annihilation are described. In addition beauty results from CDF and E653 are reviewed and prospects for studies of B physics at collider detectors are discussed.

Date: January 1, 1992

Creator: Lipton, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experimental studies of elementary particle interactions at high energies

This report reviews research program at cern; research program at fermilab; and proposals for experiments and detector systems at the SSC.

Date: October 9, 1990

Creator: Deleuse, B.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Physics at the J/psi and the status of glueballs

Recent results on the J/psi, iota(1440), and theta(1690) from the Crystal Ball, DM2, and Mark III collaborations are presented together with preliminary results on charmonium states from the CERN-ISR R704 experiment. The J/psi two-body decays into a vector and a pseudoscalar meson are discussed; these results provide information about the quark content of the eta and eta' and are relevant to models in which these states are mixed with glueballs. New spin-parity determinations of the iota(1440) … more

Date: September 1, 1984

Creator: Perrier, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Results from hadron colliders

The present status of hadron collider physics is reviewed. The total cross section for {bar p} + p has been measured at 1.8 TeV: {sigma}{sub tot} = 72.1 {plus minus} 3.3 mb. New data confirm the UA2 observation of W/Z {yields} {bar q}q. Precision measurements of M{sub W} by UA2 and CDF give an average value M{sub W} = 80.13 {plus minus} 0.30 GeV/c{sup 2}. When combined with measurements of M{sub Z} from LEP and SLC this number gives sin{sup 2}{theta}{sub W} = 0.227 {plus minus} 0.006, or m{sub … more

Date: December 14, 1990

Creator: Pondrom, L.G. (Wisconsin Univ., Madison, WI (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Resonance production in two-photon interactions

Resonance production in two-photon interactions is studied using data collected with the ASP detector at the PEP e/sup +/e/sup /minus// storage ring located at the Stanford Linear Accelerator Center. The ASP detector is a non-magnetic lead-glass calorimeter constructed from 632 lead-glass bars. It covers 94% of 4..pi.. in solid angle, extending to within 20/degree/ of the beamline. Lead-scintillator calorimeters extend the coverage to within 21 mr of the beamline on both sides. Energy resolutio… more

Date: February 1, 1989

Creator: Roe, N.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Hadronic production of J/[psi] at large [chi][sub F] in 800 GeV p+Cu and p+Be collisions

The differential cross-section d[sigma]/dx[sub F] for J/[psi] production in 800 GeV proton-nucleus collisions has been measured in the kinematic range 0.30 [le] x[sub F] [le] 0.95 and x[sub F] [lt] p[perpendicular] [lt] 5 GeV through the decay mode J/[psi] [yields] [mu][sup +][mu][sup [minus]]. The nuclear dependence of J/[psi] production over this range was measured using copper and beryllium targets. The differential cross sections are in good agreement with the predictions of the symbolical … more

Date: December 1, 1992

Creator: Kowitt, M.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Strangeonium spectroscopy at 11 GeV/c and Cherenkov Ring Imaging at the SLD

This thesis is divided into two sections, which describe portions of the data acquisition system and online software for the Cherenkov Ring Imaging Detector (CRID) for the SLD, and analyses of several low cross section strangeonium channels in data from the LASS spectrometer. The CRID section includes a description of the data acquisition system, determination of the preamplifier gain, and development of an online pulse finding algorithm based on deconvolution. Deconvolution uses knowledge of t… more

Date: July 1990

Creator: Bienz, Timothy Lawrence

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Decays of J/psi (3100) to baryon final states

We present results for the decays of psi(3100) into baryon and hyperon final states. The sample studied here consists of 1.3 million produced psi decays. The decays into nonstrange baryons agree well with currently established results, but with better statistics. In addition, significant resonance formation in multibody final states is observed. The decay psi ..-->.. anti pp..gamma.., the first direct photon decay of the psi involving baryons in the final state, is presented and the theoretical… more

Date: May 1, 1982

Creator: Eaton, M.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Antiproton annihilation in quantum chromodynamics

Anti-proton annihilation has a number of important advantages as a probe of QCD in the low energy domain. Exclusive reaction in which complete annihilation of the valance quarks occur. There are a number of exclusive and inclusive /bar p/ reactions in the intermediate momentum transfer domain which provide useful constraints on hadron wavefunctions or test novel features of QCD involving both perturbative and nonperturbative dynamics. Inclusive reactions involving antiprotons have the advantage… more

Date: October 1, 1988

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Low energy [bar p] physics at FNAL

The charmonium formation experiment is the only low energy [bar p] experiment at FNAL. This paper describes the performance of the Fermilab [bar p] Accumulator during fixed target run for the experiment and the planned upgrades. We also discuss the proposal for the direct CP violation search in [bar p] + p [yields] [bar [Lambda]] + [Lambda] [yields] [bar p][pi][sup +] + p[pi][sup [minus]].

Date: December 1, 1992

Creator: Hsueh, S. Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Review of the heavy ion physics sessions

The parallel sessions on Heavy Ion Physics covered several areas of recent progress in characterizing the nuclear equation of state and the search for deconfined quark matter. Studies of systems from 1 to several hundred GeV/nucleon have been made in order to map the behavior of nuclear matter over a wide range of temperatures and pressures. We have also considered results from proton-nucleus reactions in the heavy ion physics discussions. This should help untangle nuclear effects'' due to the … more

Date: January 1, 1991

Creator: Jacak, B.V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The physics of heavy flavors

We review the physics of heavy quark flavors, including weak decays, onium, tau leptons, mixing, the Kobayashi-Maskawa matrix, and CP violation in B decay. 36 refs., 12 figs.

Date: December 1, 1987

Creator: Gilman, Frederick J.

Item Type: Article

Partner: UNT Libraries Government Documents Department