May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

PHENIX results on jet modification with $\pi^0$- and photon-triggered two particle correlations in p+p, p(d)+Au, and Au(Cu)+Au collisions

May 16, 2018, 9:00 AM
Sala Perla, 1st Floor (Palazzo del Casinò)

Sala Perla, 1st Floor

Palazzo del Casinò

Parallel Talk Jet modifications and high-pT hadrons Jet modifications and high-pT hadrons


Joseph Osborn (University of Michigan)


As a colorless probe, direct photons balance the $p_T$ of the away-side jet at
leading order. Direct photon-hadron correlations are thus an excellent probe for
nuclear structure and QCD effects, including parton energy loss in the
Quark-Gluon Plasma.

PHENIX has measured $\pi^0$ and direct photon-triggered two-particle azimuthal
correlations in a variety of collision systems ranging from p+p to Au+Au at 200
GeV. In p+Au and d+Au collisions, no modification of the per-trigger jet yield or
away-side correlation width compared to p+p collisions is observed for direct
photon triggered correlations while an increase in the away-side width for
$\pi^0$ triggered correlations in p+Au has been measured. In Au+Au and Cu+Au collisions, direct photons have been identified statistically as well as using an isolation cut. Combining data sets from different collision systems allows us to quantify the transition from suppression at high
$z_T$ ($p_{T,h}/p_{T,gamma}$) to the enhancement of low $z_T$ particles relative to p+p, and to study this transition as a function of trigger $p_T$. The implication for our understanding of cold and hot nuclear matter from these measurements will be discussed.

Content type Experiment
Collaboration PHENIX
Centralised submission by Collaboration Presenter name already specified

Primary author

Gabor David (Brookhaven National Laboratory)

Presentation materials