Published in:
Physical Review Letters 98,23 (2007) 232001;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevLett.98.232001
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.
Keywords
Physics, Multidisciplinary
Date of this Version
January 2007