Speaker
Dr
Takao Sakaguchi
(BNL)
Description
The energy loss of the hard scattered partons in the hot dense
medium produced in relativistic heavy ion collisions has been of
interest for investigating the properties of the medium.
Recently, the second-order azimuthal anisotropy of particle
emission has been observed at a low $p_{\rm T}$ (1-3GeV/c for the RHIC case)
in long-range two-particle correlations in small systems such
as $d$+Au collisions at RHIC and p+Pb collisions at LHC.
At higher $p_{\rm T}$, on the other hand, the strength of the anisotropy
tends to become weaker, which is qualitatively similar to what
was observed in A+A collisions. In A+A collisions, the anisotropy
at higher $p_{\rm T}$ has been understood as the consequence of the
path-length dependent energy loss of hard scattered partons.
It is of a great interest whether or not the similar energy loss
phenomenon is observed in the small systems ($p$+A, $d$+A).
We present a systematic study of the azimuthal anisotropy of
particle emission from $p$($d$, $^3$He)+A to A+A collisions
using high $p_{\rm T}$ hadrons measured by the PHENIX experiment at RHIC,
and discuss the systematics of the parton energy loss across
the systems.
| On behalf of collaboration: | PHENIX |
|---|
Primary author
Dr
Takao Sakaguchi
(BNL)
