Associated charmonium production in low energy pp annihilation
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
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.
- OSTI ID:
- 21020065
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevD.75.054018; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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