J-ψProduction via χ_c Decays in 920 GeV pA Interactions

Abstract

Using data collected by the HERA-B experiment, we have measured the fraction of Jψ's produced via radiative chi_c decays in interactions of 920 GeV protons with carbon and titanium targets. We obtained R_{χ_c} = 0.32 \pm 0.06_{stat} \pm 0.04_{sys} for the fraction of Jψfrom 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.

16 pages, 5 figs

References in corpus (4)

• Production of Prompt Charmonia in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}\approx 10.6$ GeV
• Are the $J/\psi$ and ${\chi }_{c}A$ Dependencies the Same?
• Measurement of the $b\bar{b}$ Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions
• Hadroproduction of the Chi1 and Chi2 States of Charmonium in 800 GeV/c Proton-Silicon Interactions

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