Measurement of J/ψ photoproduction in ultra-peripheral Au+Au collisions at √sNN=200GeV using the PHENIX detector

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 104
Poster Electromagnetic probes


Akihisa Takahara (University of Tokyo)


The idea to use the strong electromagnetic fields present in high-energy nucleus nucleus collisions to study photoproduction at hadron colliders has attracted growing interest in recent years. PHENIX measured J/\psi photo-production in ultra-peripheal (UPC) Au+Au collisions at \sqrt{sNN} =200 GeV. We define central UPC trigger as events with no activity in the Beam-Beam Counters, but activity in ZDC and EMCal. This trigger selects the collisions with the impact parameter larger than twice the nuclear radius with a small background contribution from strong interactions. It provides a unique opportunity to study photo-production of hadrons by a strong electromagnetic field. The purpose of the measurement of J/\psi photo-production cross section in ultra-peripheral collisions is to probe the gluon distribution at low-x. We will report J/\psi cross section and its pT dependence measured using the high luminosity 2007 data.

Primary author

Akihisa Takahara (University of Tokyo)

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