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Bag model, the hyperspherical formalism and the heavy baryons

Description: The bag model framework is used to discuss the heavy baryons, triple flavored objects like ccc, cbb, etc. A nonrelativistic picture seems justified. It is insisted that the long-range interaction consist of a genuine three-body force. Once the potential energy of the three quarks is determined, the three-body Schroedinger equation is solved by the method of hyperspherical expansion. 1 table. (RWR)
Date: January 1, 1980
Creator: Richard, J. M.
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Partner: UNT Libraries Government Documents Department
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Di-leptons at the Bevalac

Description: Recent results on the production of di-leptons measured by the Di-Lepton-Spectrometer (DLS) collaboration are discussed. Results are reported from observations made on p /plus/ Be collisions with proton beams from 1.0 to 4.9 GeV and on Ca collisions with calcium beams of 1.0 to 2.0 GeV/A. The shape of the distributions are similar to that at higher energies. The low mass cross section appears to be explained by ..pi..-..pi.. annihilation, but detailed calculations are needed to substantiate tha… more
Date: March 1, 1988
Creator: Matis, H.S.
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Partner: UNT Libraries Government Documents Department
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Measuring the mass and width of the Z sup 0 : The status of the energy spectrometers

Description: The Stanford Linear Collider (SLC) located at the Stanford Linear Accelerator Center (SLAC) collides electrons and positrons produced in the linear accelerator pulse by pulse. The object is to produce collisions energetic enough to produce the heavy intermediate vector boson, the Z{sup 0}. An essential component of the SLC physics program is the precise knowledge of the center-of-mass energy of each interaction. We measure the energy of each collision by using two energy spectrometers. The spec… more
Date: May 1, 1989
Creator: Rouse, F.; Levi, M. (Lawrence Berkeley Lab., CA (United States)); Kent, J.; King, M.; Von Zanthier, C.; Watson, S. (California Univ., Santa Cruz, CA (United States)) et al.
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Partner: UNT Libraries Government Documents Department
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Probing nuclear matter with dileptons

Description: Dileptons are shown to be of interest in helping probe extreme conditions of temperature and density in nuclear matter. The current state of experimental knowledge about dileptons is briefly described, and their use in upcoming experiments with light ions at CERN SPS are reviewed, including possible signatures of quark matter formation. Use of dileptons in an upcoming experiment with a new spectrometer at Berkeley is also discussed. This experiment will probe the nuclear matter equation of stat… more
Date: June 1, 1986
Creator: Schroeder, L. S.
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Partner: UNT Libraries Government Documents Department
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Production and decay of heavy top quarks

Description: Experimental evidence indicates that the top quark exists and has a mass between 50 and 200 GeV/c{sup 2}. The decays of a top quark with a mass in this range are studied with emphasis placed on the mass region near the threshold for production of real W bosons. Topics discussed are: (1) possible enhancement of strange quark production when M{sub W} + m{sub s} < m{sub t} < M{sub W} + m{sub b}; (2) exclusive decays of T mesons to B and B{asterisk} mesons using the non-relativistic quark model; (3… more
Date: August 1, 1989
Creator: Kauffman, R.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Strange particle production in neutrino-neon charged current interactions

Description: Neutral strange particle production in charged-current muon-neutrino interactions have been studied in the Fermilab 15-foot neon bubble chamber. Associated production is expected to be the major source of strange particles in charged-current neutrino interactions. sigma-neutral and xi-minus production by neutrinos was observed. The dependence on various leptonic and hadronic variables is investigated. A fit to single and associated production of s, s/anti-s, and c quarks is described based on t… more
Date: January 1, 1986
Creator: Plano, R.; Baker, N. J.; Connolly, P. L.; Kahn, S. A.; Murtagh, M. J.; Palmer, R. B. et al.
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Partner: UNT Libraries Government Documents Department
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A search for the production of the final states. tau. sup +. tau. sup minus e sup + e sup minus ,. tau. sup +. tau. sup minus. mu. sup +. mu. sup minus , and. tau. sup +. tau. sup minus. pi. sup +. pi. sup minus in e sup + e sup minus collisions at radical s = 29 GeV

Description: We have searched for the reaction e{sup +}e{sup {minus}} {yields} {tau}{sup +}{tau}{sup {minus}}{bar f}f, where f is either an electron, muon, or charged pion, at {radical}s = 29 GeV using the Mark 2 detector at the PEP storage ring. One candidate event is found while 2.3 events are expected from known processes. We would expect to see 11 events if the cross-section for e{sup +}e{sup {minus}} {yields} {tau}{sup +}{tau}{sup {minus}}{bar f}f at {radical}s = 29 GeV were enhanced by the factor of 4… more
Date: July 1, 1991
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Partner: UNT Libraries Government Documents Department
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Dilepton (e sup + e sup minus ) production recent pp and pd studies with DLS at Berkeley

Description: The use of dileptons as probes of hot, dense hadronic matter is described. Preliminary results on dileptons produced in p-p and p-d interactions at the Bevalac are presented along with potential ramifications for existing model calculations of dileptons at these energies. Future directions of the dilepton program at Berkeley are outlined. 14 refs., 3 figs.
Date: September 1, 1991
Creator: Schroeder, L. S.
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Partner: UNT Libraries Government Documents Department
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T,b, and new particle searches at p p colliders

Description: 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.
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Partner: UNT Libraries Government Documents Department
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Properties of leptons

Description: The properties of the electron, muon, tau, and their neutrinos are reviewed. Three discrepancies in our understanding of those properties are discussed: the lifetime of orthopositronium, the mass spectra of e{sup +}e{sup -} pairs produced in heavy ion collisions, and the 1-charged particle modes problem in tau decays. The review concludes with a discussion of what we need to learn about the tau and the consequent need for a tau-charm factory. 68 refs., 7 figs., 8 tabs.
Date: December 1, 1989
Creator: Perl, Martin L.
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Partner: UNT Libraries Government Documents Department
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Trends in the study of light proton rich nuclei

Description: Recent work in light proton-rich nuclei is reviewed. Evidence for the first T/sub z/ = -5/2 nuclide, /sup 35/Ca, is presented. The mechanisms of two-proton emission following beta-decay is investigated. Future directions in this field are discussed. 23 refs., 5 figs. (WRF)
Date: September 1, 1985
Creator: Moltz, D. M.; Aysto, J.; Hotchkis, M. A. C. & Cerny, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary results from Brookhaven Experiment 802 with 14. 5 GeVu /sup 28/Si

Description: Preliminary data on beam calorimetry, charged particle multiplicities, pseudo-rapidity distributions and hadron spectroscopy from /sup 28/Si + Al and Au at 14.5 GeV per nucleon are presented. Comments on nuclear stopping, multiplicity systematics, and K..pi.. ratios are offered. 5 refs., 6 figs., 1 tab.
Date: January 1, 1987
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Partner: UNT Libraries Government Documents Department
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Capture reactions of /sup 40/Ca and /sup 48/Ca with targets of /sup 197/Au and /sup 208/Pb

Description: The reactions of /sup 40/Ca and /sup 48/Ca with targets of /sup 197/Au and /sup 208/Pb have been measured in the region from below the interaction barrier to about twice the barrier energy. The fission-like fragments were detected in a pair of position-sensitive, multi-wire proportional counters and were identified from measurements of position and time using two-body kinematics. In the region above the barrier the cross sections for capture are less than those given by the touching condition, … more
Date: March 1, 1988
Creator: Stokstad, R.; Chan, Y.; Chavez, E.; Di Gregorio, D.; di Tada, M.; Gazes, S. et al.
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Partner: UNT Libraries Government Documents Department
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Strangeonia and kin; new results from kaon hadroproduction with LASS

Description: 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.
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Partner: UNT Libraries Government Documents Department
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Search for W prime and Z prime at CDF

Description: We have searched for heavy charged and neutral vector bosons via the decays W{prime} {yields} ev, W{prime} {yields} {mu}v, Z{prime} {yields} {mu}{mu} in p{bar p} collisions at {radical}s = 1.8 TeV, using data taken with the collider Detector at Fermilab. The nonobservation of these processes leads to a lower limit (95% confidence level) of 520 GeV/c{sup 2} on the mass of the W{prime} and of 412 GeV/C{sup 2} on the mass of the Z{prime}, assuming standard model coupling to fermions. 12 refs., 6 f… more
Date: September 1, 1991
Creator: Fuess, T.
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Partner: UNT Libraries Government Documents Department
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Heavy flavor physics at hadron colliders

Description: The search for the top quark has dominated heavy flavor physics at hadron colliders. For Standard model decay of top the present mass limit in m{sub t} > 89 GeV (95% C.L.). Bottom production cross sections are quite large at hadron colliders, thus providing enough statistics for extensive studies. Results on cross sections, B{sup 0} {minus} {bar B}{sup 0} mixing, exclusive channels and rare B decays will be summarized.
Date: December 1, 1991
Creator: Barbaro-Galtieri, A.
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Partner: UNT Libraries Government Documents Department
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Radiative J/psi decays and the pseudoscalar puzzle

Description: Recent results on radiative decays of the J/PSI, obtained by the SPEAR detectors Mark III and Crystal Ball and the DCI detector DM2 at Orsay, are presented. The status of the glueball candidates theta(1690), iota(1460), and xi(220), and the decays J/PHI ..-->.. ..gamma.. Vector Vector are reviewed. A coupled channel analysis of iota(1460) decays to K anti K..pi.., rho rho, ..omega omega.., and ..gamma..rho is presented which may help to understand the pseudoscalar sector in radiative J/PHI deca… more
Date: July 1, 1985
Creator: Wermes, N.
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Partner: UNT Libraries Government Documents Department
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W mass and W asymmetry at CDF

Description: The lepton charge asymmetry from W decaying into a lepton and a neutrino is discussed (preliminary result). This measurement gives information on parton distribution functions at low x values. The derivation of the recently published W mass value of 79.91 {plus minus} 0.39 GeV/c{sup 2} is also presented. M{sub W} is used to set an upper limit on the top quark mass. 13 refs., 4 figs., 1 tab.
Date: May 1, 1991
Creator: Leone, S. (Pisa Univ. (Italy) Istituto Nazionale di Fisica Nucleare, Pisa (Italy))
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Partner: UNT Libraries Government Documents Department
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Spectroscopy of the UPSILON(2S) with the Crystal Ball

Description: The Crystal Ball experiment has been taking data at the DORIS II storage ring at DESY/Hamburg on the UPSILON(2S) and UPSILON(1S) resonances since summer 1982. Results on the hadronic transitions between the UPSILON(2S) and the UPSILON(1S) are presented as well as measurements of the radiative decays of the UPSILON(2S) to the chi/sub b/ states in inclusive and exclusive channels. The exclusive UPSILON(2S) ..-->.. ..gamma..chi/sub b/ ..-->.. ..gamma gamma..UPSILON(1S) ..-->.. ..gamma gamma..l/sup… more
Date: April 1, 1985
Creator: Irion, J.
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Partner: UNT Libraries Government Documents Department
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General Chemistry Division quarterly report, July--September 1977

Description: Analytical research and development work is reported on multielement analysis, time-resolved spectroscopy, fluorescence analysis, ionization potential of NP, excited state chemistry, polarized x ray sources, potentiometric titration of Na, determination of TATB in DMSO, determination of nitrobenzene in TATB, analysis of explosive composites, mass spectrometer automation, mass spectra calculation, solids formation in geothermal brine, water quality laboratory automation, aerosol coagulation, and… more
Date: November 30, 1977
Creator: Harrar, J.E. (ed.)
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Partner: UNT Libraries Government Documents Department
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Photon-Photon Physics with the Mark II at PEP

Description: Photon-photon interactions are studied with the Mark II detector at PEP. The inclusive production of charged hadrons at large transverse momenta and the exclusive production of meson pairs at large invarient mass are compared with recent hard scattering calculations. Copious inclusive production of K/sup 0/'s at large transverse momenta provides evidence for charm production. The radiative width of the f'(1520) is measured via its K/sub s//sup 0/ anti K/sub s//sup 0/ decay mode.
Date: April 1, 1986
Creator: Gidal, G.
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Partner: UNT Libraries Government Documents Department
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Search for the. Lambda. sub b baryon at CDF

Description: 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))
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Partner: UNT Libraries Government Documents Department
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