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p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production
mechanism
p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production
mechanism
2010-06-19
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arxiv.org/abs/1006.3846v2
Phys.Rev.D83:054015,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 3 figures, version published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.83.054015
We report that, unlike most inclusive quarkonium-production processes, the production rate for p p -> J/psi+Upsilon+X dominantly depends on two not well-known long-distance nonrelativistic QCD matrix elements, and at leading order in the strong coupling constant, which account for the transition probabilities of the color-octet spin-triplet heavy-quark-antiquark pairs c\bar{c}_8(^3S_1) -> J/psi and b\bar{b}_8(^3S_1) -> Upsilon, respectively. With the integrated luminosity ~ 100 fb^{-1} at the center-of-momentum energy sqrt{s}=14 TeV we expect that approximately 1900 p p -> J/psi+Upsilon+X events can be observed at the CERN Large Hadron Collider by tagging muon pairs, which are enough to probe to the color-octet mechanism. The forthcoming measurement may provide a useful constraint to resolve the decade-old puzzle for the polarization of prompt J/psi at the Fermilab Tevatron. If corresponding measured rate is significantly less than the prediction, it may imply that the current values for the color-octet matrix elements are overestimated.
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mechanism does not yet have a rating.
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