Charmonium production in p anti-p annihilation: Estimating cross sections from decay widths

Jul, 2005
6 pages
Published in:
  • Phys.Rev.D 73 (2006) 096003
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Abstract:
The cross sections for the charmonium production processes p pbar -> m Psi, where m is a light meson and Psi is a charmonium state, are of great interest for the planned p-pbar experiment PANDA. In this paper we estimate these cross sections using known results for the decays Psi -> m p pbar which are related to these reactions by crossing. In lieu of detailed experimental data on the decay Dalitz plots, we assume a constant amplitude as a first approximation: this implies a simple relation between the cross sections and decay widths. The single measured exclusive cross section of this type is p pbar -> pi0 J/psi, which was reported by E760 to be 130 +/- 25 pb near sqrt(s) = 3.5-3.6 GeV. In comparison, our constant amplitude estimate is about 300 pb at this energy. This suggests that our approach is useful as a simple estimate, but should be refined through detailed modeling of resonances and other energy-dependent effects in the experimental Psi -> m p pbar Dalitz plots.
  • 11.80.-m
  • 13.25.Gv
  • 13.75.Cs
  • 14.40.Gx
  • anti-p p: annihilation
  • charmonium
  • quarkonium: hadroproduction
  • meson: associated production
  • quarkonium: hadronic decay
  • quarkonium: width
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