J-psi production with NRQCD: HERA, Tevatron, RHIC and LHCReport as inadecuate



 J-psi production with NRQCD: HERA, Tevatron, RHIC and LHC


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We report on our recent calculation of the inclusive direct photo- and hadroproduction of the J-psi meson at next-to-leading order within the factorization formalism of nonrelativistic QCD. We fit the color-octet CO long-distance matrix elements , and to the transverse momentum p T distributions measured by CDF at Fermilab Tevatron and by H1 at DESY HERA and show that they also successfully describe the p T distributions from PHENIX at BNL RHIC and CMS at the CERN LHC as well as the photon-proton c.m. energy and with worse agreement the inelasticity distributions from H1. In all experiments, the CO processes are shown to be indispensable.



Author: Mathias Butenschoen; Bernd A. Kniehl

Source: https://archive.org/



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