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# Quark Matter 2017

5-11 February 2017
Hyatt Regency Chicago
America/Chicago timezone

## Azimuthal anisotropies at very high $p_{T}$ from two- and multi-particle correlations in PbPb collision at 5.02 TeV with CMS

8 Feb 2017, 14:00
20m
Regency C

### Regency C

Oral Collective Dynamics

### Speaker

Quan Wang (The University of Kansas (US))

### Description

Studies of azimuthal anisotropies for very high $p_{T}$ particles in relativistic heavy ion collisions provide crucial information on the path length dependence of the parton energy loss mechanism in the quark-gluon plasma. Final high-precision data on the elliptic ($v_{2}$) and triangular ($v_{3}$) anisotropy harmonics of charged particles, obtained with the scalar product method, are presented up to $p_{T}$ $\sim$ 100 GeV/c in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV, using data recorded during the LHC run 2 with the CMS detector. In particular, the $v_{3}$ harmonic is explored to a very high $p_{T}$ regime for the first time, allowing for an improved understanding of the effect of initial-state fluctuations on the parton energy loss. The $v_{2}$ values reaching up $p_{T}$ $\sim$ 100 GeV/c are also determined using 4-, 6- and 8-particle cumulants, shedding new light on the origin of the observed high-$p_{T}$ azimuthal anisotropies. These new results are compared to theoretical calculations and provide stringent constraints on the parton energy loss mechanisms and the influence of initial-state fluctuations.

Collaboration CMS Collective Dynamics

### Primary author

Quan Wang (The University of Kansas (US))