# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Collision energy dependence of high transverse momentum $R_{CP}$ of charged hadrons in STAR

16 Aug 2012, 16:00
2h

Poster Exploring the QCD phase diagram

### Speaker

Stephen Horvat (Y)

### Description

The observed suppression of high transverse momentum ($p_{T}$) hadrons in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200GeV, expressed via the nuclear modification factor $R_{AA}$ ($R_{CP}$), is a clear indication of partonic energy loss due to the strongly-coupled medium created in heavy-ion collisions. That result is supported by high-$p_{T}$ triggered azimuthal di-hadron correlations which compare the measured correlated yield of recoil jets in heavy-ion collisions to p+p or peripheral collision reference measurements. The collision energy dependence of jet quenching measurements can be used to put further constraints on theoretical descriptions of partonic energy loss. We will present measurements of charged hadron $R_{CP}$ over a wide range of collision energies ranging from 7.7-200 GeV. In addition, we will present the analysis status of triggered di-hadron correlations at lower RHIC energies.

### Presentation Materials

There are no materials yet.