# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## $J/\psi$ and Upsilon nuclear modification in A$+$A collisions

21 May 2014, 09:00
20m

### platinum

Contributed Talk Open Heavy Flavour and Quarkonia

### Speaker

Cesar Luiz da Silva (Los Alamos National Lab)

### Description

PHENIX presents new nuclear modification results on $J/\psi$ in Cu$+$Au and U$+$U collisions. The recently completed analysis of the modification of $J/\psi$ production in Cu$+$Au collisions at forward ($1.2< y < 2.2$) and backward ($-2.2 < y < -1.2$) rapidity is the first measurement of the rapidity dependence of the $J/\psi$ modification in unequal mass heavy ion collisions. Both hot and cold nuclear matter effects are expected to be asymmetric in rapidity in these collisions. The comparison of $d$$+$Au, Au$+$Au, U$+$U and Cu$+$Au $J/\psi$ modifications across rapidities provides insight on the balance of cold and hot nuclear matter effects. We also present new PHENIX centrality results on $\Upsilon$(1S$+$2S$+$3S) production in p$+$p and Au$+$Au collisions. These results indicate significant suppression of the $2S$ and $3S$ states in the Quark-Gluon Plasma (QGP) environment. The results on temperature dependent heavy quarkonia production and evolution in the medium have the potential to bracket the temperature of the QGP.
On behalf of collaboration: PHENIX

### Primary author

Cesar Luiz da Silva (Los Alamos National Lab)

### Co-author

Dr PHENIX Collaboration (various)

### Presentation Materials

 QM2014_quarkonia_PHENIX.pptx QM2014_quarkonia_PHENIX_v2.pdf