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Title: Associated charmonium production in low energy pp annihilation

Abstract

The QCD mechanisms underlying the exclusive strong decays and hadronic production amplitudes of charmonium remain poorly understood, despite decades of study and an increasingly detailed body of experimental information. One set of hadronic channels of special interest are those that include baryon-antibaryon states. These are being investigated experimentally at BES and CLEO-c in terms of their baryon resonance content, and are also of interest for the future PANDA experiment, in which charmonium and charmonium hybrids will be produced in pp annihilation in association with light mesons. In this paper we develop a simple initial-state light meson emission model of the near-threshold associated charmonium production processes pp{yields}{pi}{sup 0}{psi}, and evaluate the differential and total cross sections for these reactions in this model. (Here we consider the states {psi}={eta}{sub c}, J/{psi}, {psi}{sup '}, {chi}{sub 0} and {chi}{sub 1}.) The predicted near-threshold cross section for pp{yields}{pi}{sup 0}J/{psi} is found to be numerically similar to two previous theoretical estimates, and is roughly comparable to the (sparse) existing data for this process. The theoretical charmonium angular distributions predicted by this model are far from isotropic, which may be of interest for PANDA detector design studies.

Authors:
 [1];  [2];  [3]
  1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. (United States)
  3. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
Publication Date:
OSTI Identifier:
21020065
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.75.054018; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; ANNIHILATION; ANTIBARYONS; CESR STORAGE RING; CHI2-3555 MESONS; ETA C-2980 MESONS; J PSI-3097 MESONS; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PARTICLE PRODUCTION; PROTON-ANTIPROTON INTERACTIONS; PSI-3770 MESONS; QUANTUM CHROMODYNAMICS; RESONANCE PARTICLES; TOTAL CROSS SECTIONS

Citation Formats

Barnes, T., Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, and Li, X. Associated charmonium production in low energy pp annihilation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.054018.
Barnes, T., Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, & Li, X. Associated charmonium production in low energy pp annihilation. United States. doi:10.1103/PHYSREVD.75.054018.
Barnes, T., Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, and Li, X. Thu . "Associated charmonium production in low energy pp annihilation". United States. doi:10.1103/PHYSREVD.75.054018.
@article{osti_21020065,
title = {Associated charmonium production in low energy pp annihilation},
author = {Barnes, T. and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 and Li, X.},
abstractNote = {The QCD mechanisms underlying the exclusive strong decays and hadronic production amplitudes of charmonium remain poorly understood, despite decades of study and an increasingly detailed body of experimental information. One set of hadronic channels of special interest are those that include baryon-antibaryon states. These are being investigated experimentally at BES and CLEO-c in terms of their baryon resonance content, and are also of interest for the future PANDA experiment, in which charmonium and charmonium hybrids will be produced in pp annihilation in association with light mesons. In this paper we develop a simple initial-state light meson emission model of the near-threshold associated charmonium production processes pp{yields}{pi}{sup 0}{psi}, and evaluate the differential and total cross sections for these reactions in this model. (Here we consider the states {psi}={eta}{sub c}, J/{psi}, {psi}{sup '}, {chi}{sub 0} and {chi}{sub 1}.) The predicted near-threshold cross section for pp{yields}{pi}{sup 0}J/{psi} is found to be numerically similar to two previous theoretical estimates, and is roughly comparable to the (sparse) existing data for this process. The theoretical charmonium angular distributions predicted by this model are far from isotropic, which may be of interest for PANDA detector design studies.},
doi = {10.1103/PHYSREVD.75.054018},
journal = {Physical Review. D, Particles Fields},
number = 5,
volume = 75,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}