J / psi production via chi(c) decays in 920-GeV pA interactions.

HERA-B COLLABORATION , H. WAHLBERG

PHYSICS LETTERS B

Año: 2003 vol. 561 p. 61 - 72

0370-2693

Using data collected by the HERA-B experiment, we have measured the fraction of Jpsi´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 Jpsi 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.