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

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

2008-06-24

arxiv.org/abs/0806.4001v1

AIP Conf.Proc.1038:83-92,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented by J.P. Lansberg at the Joint Meeting Heidelberg-Liege-Paris-Wroclaw (HLPW08), Spa, Belgium, 6-8 March 2008, 10 pa

Scientific paper

10.1063/1.2987190

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.

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