Authors

Abstract

We measure the ratio of cross section times branching fraction, R-p=sigma B-chi c2(chi(c2)-> J/psi gamma)/sigma B-chi c1(chi(c1)-> J/psi gamma), in 1.1 fb(-1) of p (p) over bar collisions at root s=1.96 TeV. This measurement covers the kinematic range p(T)(J/psi)> 4.0 GeV/c, |eta(J/psi)< 1.0, and p(T)(gamma)> 1.0 GeV/c. For events due to prompt processes, we find R-p=0.395 +/- 0.016(stat)+/- 0.015(syst). This result represents a significant improvement in precision over previous measurements of prompt chi(c1,2) hadro production.

Published in:

Physical Review Letters 98,23 (2007) 232001;

Keywords

Physics, Multidisciplinary

Date of Version

January 2007

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