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in subjects: "Quarkonium"

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Bumps and poles in the S-matrix: A systematic study of 0 sup ++ and 2 sup ++ mesons plus a molecule approach to the E(1420) in the K K. pi. system

The goal of Hadron Spectroscopy is to find the spectrum of states formed by color singlet arrangements of quarks and gluons. Ideally these spectral states are associated with poles of the scattering matrix of hadrons which are the decay channels of the states. For example the {rho} meson is the lowest q{bar q} s-wave, spin one color singlet state and decays into {pi}{sup +}{pi}{sup -}. Since the {rho}decays in a relative p-wave, one finds the {rho} pole in the I = 1 p-wave {pi}{pi} phase shifts… more

Date: November 16, 1989

Creator: Longacre, R. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Meson spectroscopy viewed from J//PSI/ decay: Gluonic states at BEPC

The theoretical and experimental status of the search for gluonic states is reviewed. Progress clearly requires much higher statistics studies of J//psi/ decay, as will be possible at the Beijing Electron Positron Collider. 83 refs.

Date: July 1, 1987

Creator: Chanowitz, Michael S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Two-photon couplings of quarkonia with arbitrary angular momenta

The observation of a large {gamma}{gamma} width for the {sup 1}D{sub 2} q{bar q} state {pi}{sub 2}(1670) suggests that the {gamma}{gamma} couplings of many orbitally-excited light q{bar q} states may be experimentally accessible. In this talk we present {gamma}{gamma} helicity amplitudes for q{bar q} states with general angular momenta {sup 1}l{sub j} and {sup 3}l{sub j}, and note some relations and selection rules that may be useful in spectroscopic classification of orbital excitations. 14 re… more

Date: January 1, 1991

Creator: Barnes, T. (Oak Ridge National Lab., TN (United States) Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Bose-Einstein correlations in e/sup +/e/sup -/ collisions

The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhanceme… more

Date: December 1, 1987

Creator: Juricic, I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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T,b, and new particle searches at p p colliders

Experiments at the p{bar p} colliders at CERN and FNAL have an active program of heavy flavor physics. Recently, CDF at FNAL and UA1 at CERN have measured rare decays of the {Beta}{sup 0} {minus} {bar {Beta}}{sup 0} mixing. CDF has signals for {Beta}{sup {plus minus}} {yields} J/{psi}K{sup {plus minus}} and {Beta}{sup 0} {yields} J/{psi}K{sup *0}. Both CDF and UA1 have set limits on the branching ratio of {Beta}{sup 0} {yields} {mu}{sup +}{mu}{sup {minus}} and have measured {Beta}{sup 0} {minus… more

Date: August 1, 1991

Creator: Crane, D.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Strangeonia and kin; new results from kaon hadroproduction with LASS

Recent results from a high statistics study of strangeonium mesons produced in LASS by an 11 GeV/c K{sup -} beam are reviewed and compared with the quark model. New data from a variety of final states (K*{ovr K*}, {phi}{phi}, {phi}{pi}{sup 0}) produced by hypercharge exchange are described, and compared with results from other hadroproduction modes and from J/{psi} decay. 17 refs., 12 figs.

Date: December 1, 1989

Creator: Aston, D.; Bienz, T.; Bird, F.; Dunwoodie, W.; Johnson, W.B.; Kunz, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for the. Lambda. sub b baryon at CDF

The {Lambda}{sub b} baryon has been observed recently by UA1 through its decay {Lambda}{sub b} {yields} J/{psi}{Lambda}{degrees}. Although CDF finds twice as many J/{psi} and observes {Lambda}{degrees} decays, no evidence for an {Lambda}{sub b} signal is seen. The UA1 data supports a lower than expected production P{sub T} for the {Lambda}{sub b}, and therefore, a lower pion P{sub T}, below the observation threshold of CDF. This result suggests that UA1 and CDF are probably not inconsistent, bu… more

Date: April 1, 1992

Creator: Gauthier, A. (Illinois Univ., Urbana, IL (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Charmonium studies with the crystal ball

The Crystal Ball detector at SPEAR is used to analyze the decays psi' ..-->.. ..gamma gamma..psi and psi' ..-->.. ..gamma..chi,chi ..-->.. ..gamma gamma... Values are obtained for the branching ratios of psi' ..-->.. eta/..mu../sup 0/psi and psi' ..-->.. ..gamma..chi,chi ..-->.. ..gamma..psi. No evidence is found for a 2/sup 1/S/sub 0/(eta'c) state in the mass range 3129 ..-->.. 3644 MeV/c/sup 2/. Analysis of the angular distributions in the cascade chi decays yields spin and multipole assignme… more

Date: June 1, 1980

Creator: Oreglia, M.

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

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Quark Matter '87: Concluding remarks

This year marked the beginning of the experimental program at BNL and CERN to probe the properties of ultra dense hadronic matter and to search for the quark-gluon plasma phase of matter. Possible implications of the preliminary findings are discussed. Problems needing further theoretical and experimental study are pointed out. 50 refs.

Date: March 1, 1988

Creator: Gyulassy, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Review of CERN heavy-ion physics

Results from the heavy-ion experiments at the CERN SPS are reviewed in the context of possible formation and identification of a quark-gluon plasma (QGP).

Date: November 1, 1991

Creator: Odyniec, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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D0 papers on B-physics submitted to DPF '96: b-quark inclusive cross sections and b anti-b correlations using dimuons from the D0 experiment; Single muon production in the forward region at [radical]s=1. 8 TEV; Rapidity dependence of the inclusive J[psi] production in the forward region [radical]s=1. 8 TEV; A search for b [r arrow] X[mu][sup +][mu][sup [minus]] and B[sup 0] [r arrow] [mu][sup +][mu][sup [minus]] decays in p anti-p collisions at [radical]s=1. 8 TEV

Paper 1: Using dimuons collected with the D0 detector during the 1993--1995 Tevatron collider run, the authors have measured the b-quark cross section and b[anti b] correlations as given by the difference in azimuthal angle between the two muons. Both measurements agree with the NLO QCD predictions within experimental and theoretical errors. (Three other papers are included in this report.)

Date: November 1, 1996

Creator: Vititoe, D.L. (Arizona Univ., Tucson, AZ (United States). Dept. of Physics); Kozelov, Alexander; Jesik, Richard & Collaboration., D0

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear physics studies with medium energy probes

This report research in quark-quark interactions, exotic baryonic systems, and nuclear structure. (LSP)

Date: January 1, 1991

Creator: Seth, K.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Experimental review of J/psi decays

This is a review of J/psi physics from e/sup +/e/sup -/ colliders presented at the Charm Workshop in Beijing, China. The review includes a brief historical summary of J/psi physics, a general discussion of theoretical models and detailed results on radiative and hadronic J/psi decays from the Mark III, DM2, Crystal Ball and MARK II groups. 119 refs., 13 figs., 10 tabs.

Date: September 1, 1987

Creator: Toki, W.H.

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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Quarkonium: From the Bottom Up

The status of quarkonium physics is reviewed. Emphasis is placed on what can be learned from detailed studies of the b anti b system about both the spin dependent and spin independent relativistic corrections to the static potential. Expectations for the t anti t system are briefly discussed. 28 references.

Date: November 1, 1983

Creator: Eichten, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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J/. psi. and. Upsilon. production at CDF

Characteristics of J/{psi} and {Upsilon} produced at the Tevatron and detected in the dimuon channel at CDF are reviewed. The masses of the J/{psi} and {Upsilon} are measured to be 3.096 {plus minus} 0.001 GeV/c{sup 2} and 9.469 {plus minus} 0.010 GeV/c{sup 2} respectively. These mass measurements are used to determine the systematic uncertainty on the momentum scale in the central tracking chamber. 2 refs., 14 figs.

Date: January 1, 1990

Creator: Liss, T. (Illinois Univ., Urbana, IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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B-physics at CDF and prospects for the next run

Current CDF b-physics results are presented. The analysis is based on data corresponding to an integrated luminosity of 4.4 pb{sup {minus}1} recorded with the CDF detector in 88--89 at the Fermilab Tevatron p{bar p} collider ({radical}{bar s} = 1.8 TeV). Preliminary results include the differential cross section {sub dPt}/{sup d{sigma}(b)}, some reconstructed exclusive B-decays, a limit for the rare decay B{sup 0} {yields} {mu}{sup +} {mu}{sup {minus}} and a measurement of B{bar B}-mixing param… more

Date: September 1, 1991

Creator: Wenzel, H. (Istituto Nazionale di Fisica Nucleare, Pisa (Italy))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theoretical particle physics. Progress report, December 1, 1079-November 30, 1980. [Physics Dept. , Indiana Univ]

Work during the past year ranged from phenomenological studies of various quark systems to applications of quantum chromodynamics and lattice gauge theories. On the phenomenological side for mesons, studies of the charmonium and bottomonium families as well as the spectrum of states containing a single b-quark continued. As a result of some improved measurements, the topic of baryon magnetic moments was reconsidered. At the same time the properties of highly excited 3-quark systems were conside… more

Date: August 1, 1980

Creator: Hendry, A.W.; Lichtenberg, D.B. & Weingarten, D.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Hunt for the 1/sup 1/P/sub 1/ bound state of charmonium

Using the Crystal Ball detector at SPEAR, we have looked for evidence of the isospin-violating decay psi' ..-->.. ..pi../sup 01/P/sub 1/, where /sup 1/P/sub 1/ is the predicted spin-singlet p-wave bound state of charmonium. For a /sup 1/P/sub 1/ state at the predicted mass (approx. 3520 MeV), we obtain the 95% confidence level limits: BR(psi' ..-->.. ..pi../sup 01/P/sub 1/) < 0.55%, BR(psi' ..-->.. ..pi../sup 01/P/sub 1/)BR(/sup 1/P/sub 1/ ..-->.. ..gamma..n/sub c/ < 0.14%. These limits are com… more

Date: February 1, 1982

Creator: Porter, Frank C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Production of the f sub 0 (975) meson in J/. Psi. decays

Preliminary results on the production and decay of the f{sub 0}(975) meson in the processes J/{Psi} {yields} {phi}{pi}{sup +}{pi}{sup -}, J/{Psi} {yields} {phi}{pi}{sup 0}{pi}{sup 0}, J/{Psi} {yields} {phi}K{sup +}K{sup -}, and J/{Psi} {yields} {omega}{pi}{sup +}{pi}{sup -} are reported on. The data sample, corresponding to 5.8 {times} 10{sup 6} produced J/{Psi}'s, were collected with the MARK-III detector at SPEAR. In a coupled- channel fit to the invariant mass distribution of the {pi}{sup +}… more

Date: November 1, 1989

Creator: Lockman, W.S.

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

open access

Prospects for meson spectroscopy studies with anti P's at the AGS

This paper contains viewgraphs on studies of meson spectroscopy. Investigated are the pion inclusive spectrum of proton-antiproton interactions, the spectrum of nucleon-antinucleon interactions, pion missing mass spectra and mechanisms for photon-photon interactions. (LSP)

Date: January 1, 1987

Creator: Dover, C. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department