211 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "J Psi-3097 Mesons"

open access

Heavy-quark physics in quantum chromodynamics

Heavy quarks can expose new symmetries and novel phenomena in QCD not apparent in ordinary hadronic systems. In these lectures I discuss the use of effective-Lagrangian and light-cone Fock methods to analyze exclusive heavy hadron decays such as {Upsilon} {yields} p{bar p} and B {yields} {pi}{pi}, and also to derive effective Schroedinger and Dirac equations for heavy quark systems. Two contributions to the heavy quark structure functions of the proton and other light hadrons are identified: an… more

Date: April 1, 1991

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Dynamical models of B yields. psi. /J K sub + *

An issue of some interest in the general theory of CP violation on B meson decay is the relative admixture of even and odd final CP eigenstates in B {yields} {psi}/JK*{sub +}. For example, dominance of one sign of CP in this decay would increase the available modes for measuring the CP violation in the respective B meson decays in a beauty factory by a factor {approximately}2.5 and, hence, would decrease the luminosity requirements for such a factory from the CP violation perspective. Here, we … more

Date: September 1, 1990

Creator: Ward, B. F. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Top quark and SUSY (supersymmetric) searches at CDF

Searches for the top quark in p{bar p} collisions at {radical}s = 1.8 TeV are described. The analyses are based on data with an integrated luminosity of 4.4 pb{sup {minus}1} recorded with the Collider Detector at Fermilab in the 1988--1989 run. An upper limit on the t{bar t} cross section is obtained. The top quark with mass below 89 GeV/c{sup 2} is excluded at the 95% CL. Prospects for searches for the top quark in the future are presented. We also briefly present results on searches for super… more

Date: May 17, 1990

Creator: Yeh, G.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

open access

Collision Dynamics and Particle Production in Relativistic Nucleus- Nucleus Collisions at CERN

The possibility of forming a quark-gluon plasma is the primary motivation for studying nucleus-nucleus collisions at very high energies. Various signatures'' for the existence of a quark-gluon plasma in these collisions have been proposed. These include an enhancement in the production of strange particles, suppression of J/{Psi} production, observation of direct photons from the plasma, event-by-event fluctuations in the rapidity distributions of produced particles, and various other observabl… more

Date: March 1, 1990

Creator: Harris, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Review of J//psi/ decays

Recent results from the Mark III collaboration in radiative J//psi/ decays are presented. This includes a study of iota/E decays in J//psi/ el/eta/ and elelp, two pseudoscalar decays near threshold in J//psi/ el and el /bar K/K and two vector decays in J//psi/ el /bar K//sup o/*K/sup o/*. 20 refs., 9 figs.

Date: November 1, 1988

Creator: Toki, W.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent heavy ion results from CERN and Brookhaven

Results of the first round of ultrarelativistic heavy ion experiments at CERN and BROOKHAVEN are reviewed. The experiments measure global variables such as transverse energy and multiplicity to characterize the impact parameter of the collisions and compare with geometrical models of heavy ion collisions. Charged particle transverse momentum spectra are measured, and p-nucleus and nucleus-nucleus collisional look rather similar. The hardening of the spectrum at high p/sub t/, previously observe… more

Date: January 1, 1988

Creator: Jacak, B.V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear effects in J//psi/ and lepton-pair production

High-energy processes in nuclear media provide important tests of quantum chromodynamics, since in principle one can use the nuclear environment to perturb and study the mechanisms involved in confinement and hadronization. In this talk several examples of nuclear effects in QCD will be discussed that affect the propagation and hadronization of quarks and gluons in nuclear matter. The issues include: possible signatures for quark-gluon plasma formation in heavy ion collisions, particularly J//p… more

Date: September 1, 1988

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A review of experimental progress in gluonia

There has been considerable progress in gluonia investigations and their analysis. As requested by the Convenor, Rich Galik, I will cover the highlights of various conference papers and related work in an integrated manner which incorporates a review of the present state of glueballs (gluonia) to the extent space limitations allow. There are four general methods of searching for glueballs: J//psi/ radiative decay (iota, theta, xi(2.2)); OZI violating (g/sub T/, g/sub T/', g/sub T//double prime/… more

Date: October 4, 1988

Creator: Lindenbaum, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Preliminary results from Fermilab E789

Fermilab experiment 789 studies low-multiplicity decays of neutral D and B mesons in a high-rate fixed-target environment. Preliminary results from the 1991 run are presented.

Date: January 1, 1992

Creator: Peng, J. C.; Boissevain, J.; Carey, T. A.; Jansen, D. M.; Jeppesen, R.; Kapustinsky, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

open access

Hadroproduction of the Iota Meson observed in the K/sub s/K/sub s/. pi. /sup 0/ final state

Results from an experiment studying the C=+1K/sub s/K/sub s/..pi../sup O/ system produced ..pi../sup /minus plus//p interactions at 21.4 GeV/c are presented. It is shown that the structure present in the data between 1.4 and 1.5 GeV/c/sup 2/ has mass and width consistent with the (1460) observed in J//PSI/ radiative decay and most probably has J/sup PC/=O/sup /minus plus//. 19 refs., 7 figs., 1 tab.

Date: January 1, 1988

Creator: Cason, N. M.; Bensinger, J. R.; Bishop, J. M.; Biswas, N. N.; Busenitz, J. K.; Etkin, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Highlights from CDF

After a hiatus of 3 years, CDF is again taking data. Many of the upgrades made to the detector during this period are described here, along with some preliminary indications of their performance. A brief survey of the new data is presented. Prospects for the current run are discussed.

Date: November 1, 1992

Creator: Yagil, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Physics of hot hadronic matter and quark-gluon plasma

This Introductory talk contains a brief review of the current status of theoretical and experimental activities related to physics of superdense matter. In particular, we discuss latest lattice results on the phase transition, recent progress in chiral symmetry physics based on the theory of interacting instantons, new in the theory of QGP and of hot hadronic matter, mean p{sub t} and collective flow, the shape of p{sub t} distribution, strangeness production, J/{psi} suppression and {phi} enha… more

Date: July 1, 1990

Creator: Shuryak, E.V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Exotic mesons in /bar N/N annihilation

We investigate the utility of the antinucleon-nucleon (/bar N/N) annihilation process as a means of producing exotic (non /bar Q/Q) mesons. Several examples are considered of J/sup ..pi..//sup C/ exotic formation in the /bar p/p ..-->.. ..pi..X reaction. We emphasize the usefulness of quantum number filtration, achieved by preparing the initial /bar p/p atom in tagged L = 0,1 states and focusing on selected exclusive final states. 36 refs., 4 tabs.

Date: January 1, 1988

Creator: Dover, C. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

open access

PHENIX Conceptual Design Report

The PHENIX Conceptual Design Report (CDR) describes the detector design of the PHENIX experiment for Day-1 operation at the Relativistic Heavy Ion Collider (RHIC). The CDR presents the physics capabilities, technical details, cost estimate, construction schedule, funding profile, management structure, and possible upgrade paths of the PHENIX experiment. The primary goals of the PHENIX experiment are to detect the quark-gluon plasma (QGP) and to measure its properties. Many of the potential sign… more

Date: January 29, 1993

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Status Report on Fermilab Experiment E-760: A Study of Charmonium Produced by Proton-Antiproton Annihilation

This was a status report on Fermilab experiment E-760 -- an experiment to study charmonium states by resonant formation in proton-antiproton annihilation. The experiment uses antiprotons circulating in the Fermilab antiproton-accumulator as the beam and an internal hydrogen gas-jet as the target. Data taking with the full complement of apparatus started in early July 1990.

Date: September 4, 1990

Creator: Pordes, Stephen

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fermilab Physics Program for the 1990's

Following a brief introduction to Fermilab facilities and a review of the accelerator status and plans, the physics potential for the Fermilab III upgrade program is discussed for both the fixed target and collider modes.

Date: October 15, 1990

Creator: Stanfield, K. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quark gluon plasma: Overview and experimental results from E-735

A brief review of the phenomenology associated with the effort to produce and observe quark-gluon plasma in particle collisions is presented. E-735 has taken data during the 1987 Tevatron-Collider run at /square root/s = 1.8 TeV in pursuit of this goal. Results in the correlation of < p/sub t/ > with multiplicity for charged particles and p/sub t/ distributions for ..lambda../sup o/ and /bar Lambda//sup o/ are presented. 32 refs., 10 figs., 2 tabs.

Date: December 14, 1988

Creator: Turkot, F.; Alexopoulos, T.; Allen, C.; Anderson, E.W.; Areti, H.; Banerjee, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear physics studies with medium energy probes

This report discusses the quark-quark interactions involved in charmonium states; experiments with QCD overtones; and nuclear structure experiments. (LSP)

Date: January 1, 1990

Creator: Seth, K.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Future opportunities for hadron spectroscopy at the MPS

Before I go into detailed MPS experiments, I will give a summary of the status of lattice gauge calculations of glueball masses plus glueball and hybrid masses from the bag model, and the flux tube model. For the following discussion, I am going to assume that multi-quark states or molecules are best described in terms of the MIT bag model of Jaffe with its spectrum best defined by work done by R.L. Jaffe and F.E. Low using a method called The P-Matrix. Using this method one sees that all 4-qua… more

Date: December 7, 1988

Creator: Longacre, R. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

open access

Production and phenomenology of glueballs

After a brief introduction, the current status of the prominent glueball candidates are reviewed. In particular, we present a partial wave analysis of 6658 events of the reaction ..pi../sup /minus//p ..-->.. /phi//phi/n at 22 GeV/c. The data analysis reveals three resonances g/sub T/(2010), g/sub T'/(2300) and g/sub T/double prime//(2340), all with the same quantum numbers I/sup G/J/sup PC/ = 0/sup +/2/sup + +/ which comprise virtually all the production cross section. The large /phi//phi/n sig… more

Date: January 1, 1988

Creator: Chan, Chang S. & Lindenbaum, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department