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Phys. Rev. Lett. 98, 232001 (2007) [7 pages]

Measurement of σχc2B(χc2J/ψγ)/σχc1B(χc1J/ψγ) in pp̅ Collisions at s=1.96  TeV

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A. Abulencia et al. CDF Collaboration
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Received 15 March 2007; published 6 June 2007

We measure the ratio of cross section times branching fraction, Rp=σχc2B(χc2J/ψγ)/σχc1B(χc1J/ψγ), in 1.1  fb-1 of pp̅ collisions at s=1.96  TeV. This measurement covers the kinematic range pT(J/ψ)>4.0  GeV/c, |η(J/ψ)<1.0, and pT(γ)>1.0  GeV/c. For events due to prompt processes, we find Rp=0.395±0.016(stat)±0.015(syst). This result represents a significant improvement in precision over previous measurements of prompt χc1,2 hadro production.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.232001
DOI:
10.1103/PhysRevLett.98.232001
PACS:
13.60.Le, 13.85.Qk