J/Psi production in direct and resolved gamma gamma collisions

Details J/Psi production in direct and resolved gamma gamma collisions J/Psi production in direct and resolved gamma gamma collisions

2002-10-09

arxiv.org/abs/hep-ph/0210144v1

Nucl.Phys.Proc.Suppl. 116 (2003) 141-145

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at the RADCOR/LL 2002 conference. 5 pages, 3 postscript figures

Scientific paper

10.1016/S0920-5632(03)80159-7

The production of J/Psi mesons in gamma gamma collisions allows for a test of factorization in color-octet processes as predicted by NRQCD and observed at the Tevatron. We calculate the cross sections for J/Psi production with direct and resolved photons, including also the feed-down from chi_{cJ} and Psi' decays. Our NRQCD predictions are nicely confirmed by recent data from the DELPHI collaboration at CERN LEP2.

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