Speaker
Takao Sakaguchi
(BNL)
Description
Measurements of the $v_2$ of identified hadrons and of azimuthal
correlations between rapidity separated soft particles strongly
suggest the presence of collective effects in central $d$$+$Au
collisions at $\sqrt{s_{NN}}$=200 GeV. The good agreement between
low viscosity hydrodynamic calculations and experimental results
also suggests a close relationship between the effects observed in
high multiplicity $d$+Au and heavy-ion collisions. This
relationship can be further explored by extending the measurements
to higher transverse momentum where physical effects such as jet
fragmentation and energy loss begin dominating particle production.
Another handle is provided by a detailed study of centrality
dependence of the observed phenomena to pinpoint momentum versus
centrality domain where the collective effects manifest themselves.
Intermediate and high-$p_{T}$ particle measurements also contribute
to the systematic study of the baryon anomaly and jet quenching by
placing constraints on cold-nuclear-matter effects. PHENIX has
unique capabilities for measuring azimuthal correlations between
high $p_{T}$ neutral pions at midrapidity ($|\eta|<0.35$) and
clusters measured in the muon piston calorimeter (MPC) at forward
rapidity ($-3.7<\eta<-3.1$), providing effective separation of
jet bias contributions. We present new PHENIX results on rapidity
separated $\pi^0$-MPC azimuthal correlations measured over a wide
$p_T$ range in different centrality $d$$+$Au collisions at
$\sqrt{s_{NN}}$=200 GeV. We also report recent PHENIX results on
intermediate and high $p_T$ hadron production.
| On behalf of collaboration: | PHENIX |
|---|
Primary author
Takao Sakaguchi
(BNL)
