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 |
|---|
Author
Cesar Luiz da Silva
(Los Alamos National Lab)
Co-author
Dr
PHENIX Collaboration
(various)
