J-ψProduction via χ_c Decays in 920 GeV pA Interactions

Details J-ψProduction via χ_c Decays in 920 GeV pA Interactions J-ψProduction via χ_c Decays in 920 GeV pA Interactions

2002-11-12

arxiv.org/abs/hep-ex/0211033v2

Phys.Lett.B561:61-72,2003

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 5 figs

Scientific paper

10.1016/S0370-2693(03)00407-6

Using data collected by the HERA-B experiment, we have measured the fraction of J\psi's produced via radiative chi_c decays in interactions of 920 GeV protons with carbon and titanium targets. We obtained R_{\chi_c} = 0.32 \pm 0.06_{stat} \pm 0.04_{sys} for the fraction of J\psi from chi_c decays averaged over proton-carbon and proton-titanium collisions. This result is in agreement with previous measurements and is compared with theoretical predictions.

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