J/Psi Analysis in Ultra Peripheral Collisions at Relativistic Heavy Ion Collider with STAR

Details J/Psi Analysis in Ultra Peripheral Collisions at Relativistic Heavy Ion Collider with STAR J/Psi Analysis in Ultra Peripheral Collisions at Relativistic Heavy Ion Collider with STAR

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprd10005m&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #D10.005

Physics

Scientific paper

Relativistic heavy ions carry strong transverse electromagnetic fields which can be treated as sources of quasi-real virtual photons. The ions interact through photon-Pomeron and photon-photon collisions at impact parameter more than twice the nuclear radius, so hadronic interactions are suppressed. We present recent results of the STAR experiment at RHIC measurement of J/ψ photoproduction in 200 (GeV) AuAu collisions at RHIC. The pT distribution of the J/ψ mesons peaks at very low pT, consistent with expectations for coherent photoproduction. Both the photoproduction cross section and the J/ψ rapidity distribution are expected to show the effects of gluon shadowing. The distribution of rapidity within y < 1 for the J/ψ mesons are also presented.

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