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in subjects: "Baryon-Baryon Interactions"

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Recent experimental results on the beam-beam effects in storage rings and an attempt of their interpretation

The latest available experimental results on the luminosity, the space charge parameters, and the beam blowup as functions of particle energy and beam current are reviewed. The comparison with the phenomenological diffusion theory is done and useful scaling laws are derived. Some implications for anti p p storage rings are discussed.

Date: June 1, 1980

Creator: Kheifets, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Heavy mass states

The indirect evidence for the production of a heavy lepton and direct evidence for the product of a new hadronic state or states in proton-proton interactions is considered for the interpretation requiring the existence of two more leptons and two new quarks. It is shown that such a picture is consistent and in good agreement with existing data. The new structure is located at M = 9.54 GeV/c/sup 2/ and is much wider than the experimental resolution. Also it is asymmetric, suggesting the presenc… more

Date: August 23, 1977

Creator: Paschos, E. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proceedings of the symposium on experiments using enriched antiproton, polarized proton, and polarized antiproton beams at Fermilab energies

The conference included 10 papers, one of which appeared previously under conference number Conf: 770675-1. Separate abstracts were prepared for the remaining nine papers. (JFP)

Date: June 10, 1977

Creator: Yokosawa, A. (ed.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A study of tau decays of the W boson at CDF (Collider Detector at Fermilab)

A report is given of a search for tau decays of the W boson in p{bar p} collisions at {radical}s = 1.8 TeV using the Collider Detector at Fermilab (CDF). A description of a hardware trigger specifically designed to enhance the number of events with tau decays is presented along with the results of a preliminary analysis of data taken during the 1988--89 run of CDF. 10 refs., 4 figs.

Date: January 3, 1990

Creator: Gladney, L. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Initial energy density of quark-gluon plasma in relativistic heavy-ion collisions

Recently, there has been considerable interest in the central rapidity region of highly relativistic heavy-ion collisions. Such an interest stems from the possibility of creating hadron matter of high energy density which may exceed the critical energy density for a phase transition between ordinary confined matter and the unconfined quark-gluon plasma. The experimental searches and identification of the quark-gluon plasma may provide a new insight into the question of quark confinement. The es… more

Date: January 1, 1984

Creator: Wong, C.Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Antiproton driven microfission-fusion on closer inspection

A closer look at the energetics of antiproton annihilation in real systems, coupled to hydrodynamics, materials strength, particle transport, equations of state, and related interactions is necessary to assess ultimate viability. The systematics of antiproton microfission-fusion are the subject of this analysis, as well as technology constraints.

Date: January 1, 1992

Creator: Wienke, B.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hadron-hadron physics at high energy and luminosity

I review some recent theoretical issues relevant to the physics of hadron-hadron collisions. I discuss processes where either energy or luminosity is the most important feature and emphasize the need for experiments at luminosities of 10{sup 33}cm{sup -2}sec{sup 1} if the full range of physics options is to be thoroughly explored. 22 refs., 10 figs.

Date: November 8, 1989

Creator: Hinchliffe, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fermi molecular dynamics

classical many body models supplemented by repulsive momentum-dependent potentials to simulate the Pauli and Heisenberg principles have been use with some success for nuclear and atomic bound state and collision problems. They are capable of describing mean ground state properties, hydrodynamics, shocks (if warranted by the physics), viscosity, correlations, clustering, fragmentation, etc. We have become interested in the Feldmeier Gaussian packet formulation since it is based on a variational … more

Date: January 1, 1991

Creator: Wilets, L. & Beck, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Formation of a quark-gluon plasma in nuclear collisions

The spatial dependence of the energy deposition in the fragmentation regions is estimated for nuclear collisions at ISR energies, ..sqrt..s/A >approx. 30 GeV/nucleon. Two models (the trailing cascade and sequential decay scenarios) are contrasted. The results are compared to the quark-gluon plasma energy density computed via QCD lattice methods.

Date: June 1, 1982

Creator: Gyulassy, M.

Item Type: Article

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

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experimental Determination of the Effective Nucleon-Nucleon Interaction for P-Nucleus Reactions at Intermediate Energies

A complete measurement of the polarization transfer observables has been made for the first time in the (p,p') reaction at intermediate energies. Measurements are reported for the /sup 12/C(p,p') /sup 12/C reaction to the 1/sup +/, T = 0(12.71 MeV) and 1/sup +/, T = 1(15.11 MeV) states at 500 MeV at laboratory scattering angles of 3.5/sup 0/, 5.5/sup 0/, 7.5/sup 0/, and 12.0/sup 0/. Linear combinations of these observables are shown to exhibit a very selective dependence on the isoscalar and is… more

Date: January 1, 1982

Creator: McClelland, J. B.; Aas, B. & Azizi, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tests of parity and time reversal invariance in neutron-nucleus scattering

I'll discuss the experiments in which parity violation has been measured in low energy neutron-nucleus scattering. The interest is two-fold: to understand how parity violation in the nucleon-nucleon (NN) interaction manifests itself in a complicated many-body system and to show that the large enhancements observed make this a good laboratory to search for violations of TRI. Further, the procedure of relating the measured parity violating asymmetries to the under-lying NN interaction will be imp… more

Date: January 1, 1989

Creator: Seestrom, S. J.; Bowman, C. D.; Bowman, J. D.; Knudson, J.; Mortensen, R.; Penttila, S. et al.

Item Type: Article

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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Calculations of anti pp. -->. anti yy near threshold

The reactions anti pp ..-->.. anti yy will soon be studied near threshold at LEAR. Comparison of theoretical calculations with the measured differential cross sections, polarizations and spin correlations may help to determine the role of various meson exchange terms and the extent to which quark degrees of freedom are important. Calculations along these lines are in progress and are described briefly.

Date: January 1, 1982

Creator: Eisenstein, R. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Medium energy measurements of n-p parameters. Progress in research, January 1-December 31, 1979. [Univ. of Texas at Austin, 1979]

Research on the experimental determination of nucleon-nucleon amplitudes at intermediate energies is summarized. Separate abstracts were prepared for four of the sections of this report. 20 figures. (RWR)

Date: January 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Theory of spin dependence at very high energies. [Review, S matrix]

The point of view taken is to introduce a number of topics for possible discussion during the course of this workshop. Some of the theoretical expectations for polarization phenomena are reviewed assuming that hadrons are composite. Polarization phenomena are considered from an S-matrix point of view.

Date: January 1, 1977

Creator: Thomas, G. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ordered S-matrix approach to the topological expansion for baryons and mesons. [Ordered Hilbert space, Reggeon closed loops]

A proposal is made for extending to processes involving baryons the ordered Hilbert space approach to the topological expansion. The proposal is based on a topological classification scheme for baryonic processes that is similar to one used previously for the lowest-order contributions, but is in terms of the minimum number of reggeon closed loops instead of handles.

Date: August 16, 1977

Creator: Stapp, Henry P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A measurement of the p p total cross section at radical s = 1800 GeV

The {bar p}p differential elastic scattering cross section was measured at {radical}{bar s} = 1800 GeV, using an improved accelerator luminosity determination and CDF small angle data in the range of 0.05 {le} t {le} 0.2(GeV/c){sup 2}. By extrapolating the differential cross sections to t=0 and using the optical theorem we obtain a total cross section of {sigma}{sub tot}({bar p}p) = 72.0 {plus minus} 3.6 mb. This result is preliminary in the sense that we expect to further reduce the systematic… more

Date: October 1, 1991

Creator: White, S. (Rockefeller Univ., New York, NY (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Heavy flavor physics at hadron colliders

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear Physics Laboratory annual report, University of Washington April 1992

This report contains short discusses on topics in the following areas: astrophysics; giant resonances and photonuclear reactions; nucleus-nucleus reactions; fundamental symmetries; accelerator mass spectrometry; medium energy nuclear physics; ultra-relativistic heavy ion collisions; cluster fusion; instrumentation; van de graaff accelerators and ion sources; and computer data acquisition systems. (LSP)

Date: January 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Production of. gamma. ,. pi. /sup 0/ and eta at large transverse momenta

A measurement of direct photon production, as well as of ..pi../sup 0/ and eta meson production, has been performed at Fermilab. Data were taken for 200 GeV/c p and ..pi../sup +/ incident on Be, C and Al targets. The ratio of ..gamma../..pi../sup 0/ inclusive cross sections is presented for transverse momenta between 2 and 5 GeV/c.

Date: January 1, 1982

Creator: Biel, J.; Bromberg, C. & Brown, B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Measurement of K/sub NN/, K/sub SS/, K/sub SL/, and K/sub LL/ in polarized np. -->. polarized pn at 800 MeV in the CEX region

The spin transfer parameters K/sub NN/, K/sub SS/, K/sub SL/, and K/sub LL/ have been measured for np elastic scattering at 800 MeV between 165/sup 0/ and 180/sup 0/ c.m. The parameters K/sub NN/ and K/sub LL/ are in good agreement with the quasi-free reaction polarized pd ..-->.. polarized npp at 180/sup 0/.

Date: January 1, 1980

Creator: Ransome, R.D.; Hollas, C.L. & Riley, P.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Isolated single and double direct photon production at CDF

We present measurements of isolated direct phonon production in {bar p}p collisions at {radical}s = 1.18 TeV from the 1988--89 run of the Collider Detection at Fermilab (CDF). Quantum Chromodynamics is tested against measurements of the transverse momentum spectrum of single photon production ({bar p}p {yields} {gamma} + X), double photon production ({bar p}p {yields} {gamma}{gamma} + X), and the distribution of cos{theta} * in photon-jet events ({bar p}p {yields} {gamma}{sub J} + X). We also p… more

Date: September 1, 1991

Creator: Harris, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proposal to the Department of Energy for participation in the UA1 experiment

This proposal is to the Department of Energy for 501.6K dollars (349.6K operations and 152K equipment) for continued participation in the UA1 experiment on proton-antiproton collisions. The UA1 experiment is the study of high-energy proton-antiproton collisions in the Super-Proton-synchrotron (SPS) Collider at CERN. A major upgrade of the UA1 detector is in progress for operation with the upgraded antiproton source (ACOL). The US groups have played an increasingly prominent role in UA1 during t… more

Date: February 1, 1988

Creator: Rohlf, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department