# Quark Matter 2015 - XXV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

September 27, 2015 to October 3, 2015
Kobe, Fashion Mart, Japan
Japan timezone

## PHENIX results on jet correlations via high-$p_T$ hadrons and photons

Sep 29, 2015, 11:50 AM
20m
KFM Hall "IO"

### KFM Hall "IO"

Contributed talk Jets and High pT Hadrons

Ali Hanks

### Description

Suppression of high $p_{T}$ hadrons in heavy ion collisions is a well-known phenomenon, understood to be a result of in-medium energy loss of partons. To explore more precisely the underlying energy loss mechanism, PHENIX has measured many complementary observables. Fractional energy loss of single hadrons vs the number of participants in Au$+$Au and Cu$+$Cu collisions reveal scaling laws which can constrain models. Back-to-back correlations between direct photons and hadrons provide access to the initial parton energy prior to in-medium interactions. Two-particle correlations with an azimuthal angle selection of the trigger particle with respect to the reaction plane can control for the parton path length inside the medium. Comparing near-side to away-side correlations in $d$$+Au collisions to those in p$$+$$p$ collisions provides a precise measurement of possible cold nuclear matter effects or other phenomena not yet accounted for. Recent results from PHENIX on high-$p_{T}$ particle correlations will be presented.
On behalf of collaboration: PHENIX

Ali Hanks