Speaker
itaru nakagawa
(RIKEN)
Description
Observations of possible collective effects in high-multiplicity
$p$$+$$p$ collisions at the LHC and in $p$$+$Pb and $d$$+$Au
collisions at the LHC and RHIC challenge our understanding of the
requirements for quark-gluon plasma formation. To further
investigate this, PHENIX recorded high statistics $p$$+$$p$ and
$p$$+$Au data sets in 2015. In both cases, high-multiplicity
triggers were implemented using the forward silicon detector (FVTX)
and the beam-beam counter (BBC) covering pseudorapidity
$1.0<|\eta|<3.0$ and and $3.1<|\eta|<3.9$, respectively. The
large high-multiplicity event samples enable highly differential
analyses to look for collective effects. We report results on large
pseudo-rapidity-separation correlations investigating whether the
near-side ridge is seen in high-multiplcity $p$$+$$p$ events at
RHIC. We also report the extraction of flow coefficients from
azimuthal anisotropies in $p$$+$Au and compare the results with
theoretical expectations, including viscous hydrodynamics where the
elliptic flow strength is expected to be substantially smaller than
in $d$$+$Au and $^3$He$+$Au at the same energy.
| On behalf of collaboration: | PHENIX |
|---|
Author
itaru nakagawa
(RIKEN)
