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in subjects: "Quark Model"

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K/sup -/p interactions at 11 GeV/c: new results on strange meson systems

The status of our programmatic study of states containing a strange quark is briefly reviewed. An 11 GeV/c K/sup -/p experiment run on the LASS spectrometer at SLAC is discussed and preliminary results presented for several inelastic channels based on approximately one half of the available data sample. In addition, new results utilizing the full statistics of the experiment are presented for the elastic K/sup -/..pi../sup +/ channel from the K/sup -/..pi../sup +/n final state. The well establi… more

Date: June 1, 1980

Creator: Ratcliff, B.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress report on research program in elementary particle theory, 1979-1980. [Univ. of Texas at Austin]

A qualitative description is given of research in the following areas: particle physics in relativistic astrophysics and cosmology; phenomenology of weak and electromagnetic interactions; strong interaction physics and quark-parton physics; quantum mechanics, quantum field theory, and fundamental problems; and groups, gauges, and grand unified theories. Reports on this work have already been published, or will be, when it is completed. (RWR)

Date: January 1, 1980

Creator: Sudarshan, E.C.G. & Ne'eman, Y.

Item Type: Report

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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Delta, iota and other meson spectroscopies

This talk is given from the point of view of an experimentalist. Meson spectroscopy in the 1 to 3 GeV region is interesting because experiments exploring this region, in particular radiative psi decay, have found a rich structure of resonances too complicated to unravel with any one experiment, and not easily interpreted with any one theoretical model. None of the theoretical calculations predicting all kinds of interesting and exotic objects in this region is very convincing or reliable. Addit… more

Date: May 1, 1986

Creator: Lipkin, Harry J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The multistring model VENUS for ultrarelativistic heavy ion collisions

The event generator VENUS is based on a multistring model for heavy ion collisions at ultrarelativistic energies. The model is a straightforward extension of a successful model for soft proton-proton scattering, the latter one being consistent with e/sup )plus/)e/sup )minus/) annihilation and deep inelastic lepton scattering. Comparisons of VENUS results with pA and recent AA data alow some statements about intranuclear cascading. 18 refs., 7 figs

Date: February 1, 1988

Creator: Werner, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Jet physics at PEP and PETRA

Recent data on the fragmentation of quarks at PEP and PETRA energies is discussed in the context of phenomenological models of parton fragmentation. Emphasis is placed on the experimental evidence for parton showers as compared to a fixed order QCD treatment, on new data on inclusive hadron production and on detailed studies of baryon production in jets. 63 refs., 22 figs., 3 tabs.

Date: September 1, 1987

Creator: Hofmann, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Inclusive electron scattering at high Q/sup 2/ in the region 1 < x < 3

New inclusive electron scattering data at high Q/sup 2/ from nuclei taken in the x range unavailable to the free nucleon are presented. The ratios of cross section per nucleon, (4/56)d sigma/sup Fe//d sigma/sup He/, show a plateau for 1.3 < x < 2.0 which has been suggested as a signature of quark clusters in nuclei. The subtraction of the quasielastic cross section from the inclusive spectra reveals that the data scale in x at low momentum transfer. A proposal for a new experiment is discussed.… more

Date: January 1, 1987

Creator: Day, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Searching for the Higgs in ep collisions at LEP/LHC

We investigate the possibility to observe an intermediate mass Higgs in ep collisions at LEP/LHC. We find that such a particle can be observed once a reasonable level of flavor identification is available to separate efficiently the b{bar b} decay mode of the Higgs from most of the background. 18 refs., 11 figs., 7 tabs.

Date: November 1, 1990

Creator: Grindhammer, G.; Haidt, D.; Ohnemus, J.; Vermaseren, J. & Zeppenfeld, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Multiparticle production in deep inelastic lepton scattering and soft proton proton collisions

We demonstrate how the theoretical knowledge about multiparticle production in deep inelastic lepton scattering can be incorporated into a multistring model for low p/sub t/ proton proton collisions. 25 refs., 8 figs.

Date: June 1, 1987

Creator: Werner, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Argonne National Laboratory, High Energy Physics Division: Semiannual Report of Research Activities, July 1, 1986-December 31, 1986

This paper discusses the research activity of the High Energy Physics Division at the Argonne National Laboratory for the period, July 1986-December 1986. Some of the topics included in this report are: high resolution spectrometers, computational physics, spin physics, string theories, lattice gauge theory, proton decay, symmetry breaking, heavy flavor production, massive lepton pair production, collider physics, field theories, proton sources, and facility development. (LSP)

Date: January 1, 1987

Item Type: Report

Partner: UNT Libraries Government Documents Department

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What is glue good for, or gluons come out of the closet. [Quark-parton model, quantum chromodynamics review]

The possible role of gluons in hadronic processes as suggested by the quark-parton model and QCD is discussed and evaluated. Attention is focused on heavy (e.g., charmed) hadron production, large p/sub T/ hadronic physics, and massive lepton pair production at large p/sub T/. A discussion of more rigorous tests of QCD and the role of gluons in e/sup +/e/sup -/ annihilation is also given. 55 references.

Date: June 1, 1978

Creator: Ellis, S. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Statistical mechanics and field theory. [Path integrals, lattices, pseudofree vertex model]

Field theory methods are applied to statistical mechanics. Statistical systems are related to fermionic-like field theories through a path integral representation. Considered are the Ising model, the free-fermion model, and close-packed dimer problems on various lattices. Graphical calculational techniques are developed. They are powerful and yield a simple procedure to compute the vacuum expectation value of an arbitrary product of Ising spin variables. From a field theorist's point of view, t… more

Date: May 1, 1979

Creator: Samuel, S.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Gluonia. [Xi-2200 resonances]

The postulated existence of hadrons with no quark content, implied by the non-Abelian nature of quantum chromodynamics, has been the object of much experimental activity. Recent data from radiative psi decay permit a confrontation of available evidence with the most simple-minded criteria for their appearance. In the absence of compellingly positive evidence we give a rating of the relative merits of several possible candidates. 36 references, 17 figures.

Date: January 1, 1985

Creator: Heusch, C.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of heavy flavored particles

This report discusses progress on the following topics: time-of- flight system; charmed baryon production and decays; D decays to baryons; measurement of sigma plus particles magnetic moments; and strong interaction coupling. (LSP)

Date: January 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Weak neutral current: a determination of its structure and an analysis of the error due to theoretical and experimental uncertainties

The most recently available neutral current data, together with previous measurements, was used to determine in a model independent way the structure of the hadronic and leptonic neutral currents. In the theoretical treatment of ..nu.. deep inelastic scattering, the effects of quantum chromodynamics, including the contribution of s and c quarks were evaluated. 64 references. (JFP)

Date: January 1, 1979

Creator: Langacker, P.; Kim, J. E.; Levine, M.; Williams, H. H. & Sidhu, D. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A new string model (VENUS 2) for hadronic collisions based on color exchange between quarks and antiquarks

We describe the latest version of the string model VENUS, taking also into account antiquarks as participants in the color exchange (string flip) process, the basic mechanism to form strings. An important consequence is a rapidity plateau for protons and lambdas in symmetric heavy ion collision contradicting the assumption of transparency. 10 refs., 7 figs.

Date: May 1, 1989

Creator: Werner, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Narrow structures observed in the p-p analyzing power

The momentum dependence of the p-p elastic analyzing power has been measured in small steps using an internal target during polarized beam acceleration from 1 to 3 GeV/c. The momentum bin size ranges from 5 to 18 MeV/c. The relative uncertainty of the analyzing power is typically less than 0.01 for each momentum bin. Narrow structures have been observed in the two-proton invariant mass distribution of the analyzing power. A brief discussion on the interpretation of the present results is also g… more

Date: January 1, 1990

Creator: Hajime, Shimizu (Yamagata Univ. (Japan). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High energy physics program at Texas A M University

The Texas A M high energy physics program has achieved significant mile-stones in each of its research initiatives. We are participating in two major operating experiments, CDF and MACRO; the development of two new detector technologies, liquid scintillating fiber calorimetry and knife-edge chambers; and two SSC detector proposals, SDC and TEXAS/EMPACT. We have developed prototypes of a liquid-scintillator fiber calorimeter system, in which internally reflecting channels are imbedded in a lead … more

Date: October 1, 1990

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Research accomplishments and future goals in particle physics

This document presents our proposal to continue the activities of Boston University researchers in high energy physics research. We have a broad program of participation in both non-accelerator and accelerator-based efforts. High energy research at Boston University has a special focus on the physics program of the Superconducting Supercollider. We are active in research and development for detector subsystems, in the design of experiments, and in study of the phenomenology of the very high ene… more

Date: November 30, 1990

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Observation of narrow structures in the p-p analyzing power around 1 GeV

The momentum dependence of the analyzing power Ay in proton-proton elastic scattering has been measured in small steps using an internal target inserted into a polarized proton beam during acceleration from 1 to 3 GeV/c. The momentum bin size ranges from 5 to 18 MeV/c. The relative uncertainty of the analyzing power, {Delta}Ay, is typically less than 0.01 for each momentum bin. Narrow structures have been observed in the two-proton invariant mass distribution of the analyzing power. 15 refs., 5… more

Date: January 1, 1989

Creator: Hajime, Shimizu (Yamagata Univ. (Japan). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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(Research in elementary particles and interactions). [1992]

Research of the Yale University groups in the areas of elementary particles and their interactions are outlined. Work on the following topics is reported: development of CDF trigger system; SSC detector development; study of heavy flavors at TPL; search for composite objects produced in relativistic heavy-ion collisions; high-energy polarized lepton-nucleon scattering; rare K{sup +} decays; unpolarized high-energy muon scattering; muon anomalous magnetic moment; theoretical high-energy physics … more

Date: May 1, 1992

Creator: Adair, R.; Sandweiss, J. & Schmidt, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Amplitude analyses of hypercharge exchange reactions

No Description Available.

Date: April 1, 1973

Creator: Field, R.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-energy pion-nucleus scattering at LAMPF

Recent data obtained for pion-nucleus interactions above the [triangle](1232) is presented. The expected long mean-free path at pion energies above the [3,3] resonance is demonstrated in elastic scattering. Evidence for unexpected nuclear transparency for outgoing pions at resonance energies is presented. A new technique measuring virtual [triangle] components of the nuclear wave function is suggested.

Date: January 1, 1993

Creator: Morris, C.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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