# Quark Matter 2017

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

## Jet-Hadron correlations in pp and Pb-Pb collisions with ALICE

Not scheduled
2h 30m
Hyatt Regency Chicago

#### Hyatt Regency Chicago

151 East Wacker Drive Chicago, Illinois, USA, 60601
Board: G04
Poster

### Speaker

Raymond Ehlers (Yale University (US))

### Description

Jet energy loss in the Quark Gluon Plasma (QGP) is an active area of research, with many different measurement techniques attempting to determine its properties. One technique is to measure the azimuthal correlations of a trigger jet and the associated hadrons in the event. These measurements, known as jet-hadron correlations, are expected to be sensitive to broadening and softening of an associated recoil jet due to jet quenching. To help get a handle on energy loss, the path length of the recoil jet can be varied by imposing a surface bias condition on the trigger jet population. Previous measurements with such a bias at RHIC have already shown jet-hadron correlations to be a useful tool for studying energy loss. In particular, by comparing heavy ion measurements to pp, the correlations exhibit a strong suppression of higher $p_{{\rm T}}$ hadrons, which is balanced by an excess of lower $p_{{\rm T}}$ hadrons.

For this analysis, the azimuthal jet-hadron correlations are constructed from a trigger R=0.2 full (charged + neutral) jet, which is correlated with charged hadrons. In an effort to enhance the surface bias and reduce the impact of the background, jets are required to pass a leading constituent cut and are reconstructed using only high energy and momentum constituents. We present the current status of the analysis, including measurements of associated hadron yields and widths in central Pb–Pb data collected at $\sqrt{s_{\mathrm NN}}$ = 2.76 TeV by the ALICE Collaboration. These measurements will also be compared to jet-hadron correlations measured in pp.

Preferred Track Jets and High pT Hadrons ALICE

### Primary author

Raymond Ehlers (Yale University (US))