Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-28
Phys.Rev.Lett.106:022003,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 10 figures; manuscript matches the one being printed in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.106.022003
We calculate the cross section of inclusive direct J/psi hadroproduction at next-to-leading order (NLO) within the factorization formalism of nonrelativistic quantum chromodynamics (NRQCD), including the full relativistic corrections due to the intermediate 1S_0^[8], 3S_1^[8], and 3P_J^[8] color-octet states. We perform a combined fit of the color-octet (CO) long-distance matrix elements to the transverse-momentum (p_T) distributions measured by CDF at the Fermilab Tevatron and H1 at DESY HERA and demonstrate 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. This provides a first rigorous test of NRQCD factorization at NLO. In all experiments, the CO processes are shown to be indispensable.
Butenschoen Mathias
Kniehl Bernd A.
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