J/psi production at the Tevatron and RHIC from s-channel cut

Abstract

We report on our recent evaluation of the s-channel cut contribution to J/psi hadroproduction. We show that it is likely significantly larger than the usual cut contribution of the colour-singlet model (CSM), which is known to underestimate the experimental measurements. Here the s-channel cut develops for configurations with off-shell quarks in the bound state. A correct treatment of its contribution requires the introduction of a four point function, partially constrained by gauge invariance and limiting behaviours at small and large momenta. When the unconstrained degrees of freedom are fixed to reproduce the Tevatron data, we show that RHIC data are remarkably well reproduced down to very low transverse momenta P_T without need of resummation of initial-state gluon effects. This unique feature might be typical of s-channel cut contribution.

Presented by J.P. Lansberg at the Joint Meeting Heidelberg-Liege-Paris-Wroclaw (HLPW08), Spa, Belgium, 6-8 March 2008, 10 pages, 8 figures, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty (included)

References in corpus (2)

• Upsilon production at the Tevatron and the LHC
• Transverse momentum dependence of J/psi shadowing effects

Cited by in corpus (8)

• Heavy quarkonium: progress, puzzles, and opportunities
• On the mechanisms of heavy-quarkonium hadroproduction
• Transverse momentum dependence of J/psi polarization at midrapidity in p+p collisions at sqrt(s)=200 GeV
• Polarization of prompt J/psi in proton-proton collisions at RHIC
• Quarkonia measurement in p+p and d+Au collisions at sqrt(s)=200 GeV by PHENIX Detector
• From production to suppression, a critical review of charmonium measurements at RHIC
• Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV
• Early times and thermalization in heavy ion collisions: a summary of experimental results for photons, light vector mesons, open and hidden heavy flavors