Speaker
Dr
shengli huang
(PHENIX Collaboration)
Description
Traditionally $p(d)$$+$A collisions at RHIC and the LHC were considered as
a tool to study cold nuclear matter effects. Production of the hot and
dense medium in such collisions was not expected. However recent
measurements has challenged this assumption with the observation of
long-range correlations in angular distributions of hadron pairs
with low transverse momentum. The observed modulations are very
similar to those previously seen in A$+$A collisions which are widely
thought to arise from hydrodynamic flow. The same hydrodynamic models
used in heavy ion collisions have been successful in describing
the $p(d)$$+$A results. However the long-range correlations observed
in $p(d)$$+$A collisions can also be qualitatively described within
the Color Glass Condensate models.
In this talk we present new PHENIX results for azimuthal
angular correlations between charged hadrons measured at mid-rapidity
($|\eta|<0.35$) and energy deposited in calorimeter towers in the
Au-going direction at large rapidity ($-3.7<\eta<-3.1$) in central
$d$$+$Au collisions at $\sqrt{s_{NN}} = 200$~GeV. We report the first
direct evidence for enhanced near-side angular correlations across
$|\Delta\eta| > 2.75$ at RHIC. We also present the first measurement
of $v_2$ for identified charged pions and (anti-)protons in $d$$+$Au
at RHIC, and observe a mass-ordering pattern similar to that seen in
A$+$A collisions.
| On behalf of collaboration: | PHENIX |
|---|
Primary author
Dr
shengli huang
(PHENIX Collaboration)
