# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Constraining Cold Nuclear Matter Effects on $J/\psi$ production in Au +Au Collisions

Not scheduled
Théâtre National (Centre Bonlieu)

### Théâtre National

#### Centre Bonlieu

France
Board: 77
Poster Heavy flavor and quarkonia production

### Speaker

Darren McGlinchey (Florida State University)

### Description

Recent results from PHENIX on $J/\psi$ production in d+Au collisions have shown that $J/\psi$'s are significantly suppressed at forward rapidity. This has interesting implications for $J/\psi$ suppression in Au+Au collisions, and may provide an answer to the $J/\psi$ puzzle. We try to constrain these cold nuclear matter (CNM) effects by fitting the EPS09 parametrization plus a break-up cross section to the PHENIX data in each rapidity range. In contrast to previous work, a stronger than linear dependence of initial-state shadowing on the nuclear thickness is employed to better fit the d+Au data. We extrapolate our results to predict the CNM effects on $J/\psi$ production in Au+Au collisions and compare with the PHENIX results. We find that some $J/\psi$ suppression remains in central collisions after factoring out the CNM effects and that the forward and midrapidity data are now in agreement within uncertainties.

### Primary author

Darren McGlinchey (Florida State University)

### Co-author

Anthony Frawley (Florida State University)

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