Charmonium production in p anti-p annihilation: Estimating cross sections from decay widths
Jul, 2005Citations per year
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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