# Quark Matter 2018

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

## Angular correlations between heavy and light jet-particles as a means to study in-medium heavy-quark energy loss

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Open heavy flavour

### Speaker

Martin Rohrmoser (Jan-Kochanowski University Kielce)

### Description

Energetic heavy quarks passing through the hot and dense medium of a quark-gluon plasma (QGP), represented by the resulting mesons, are viewed as a suitable probe for the interactions inside of the QGP, in particular the mechanisms of energy loss, as they are less likely to thermalize within the medium and are mostly created at early stages of the medium evolution.
However, models of both, purely collisional energy loss as well as combinations of collisional and radiative energy loss are equally successful for reproducing the nuclear modification factor $R_{AA}$ and the elliptic flow $v_2$ [1]. In an attempt to discriminate between the two different energy-loss mechanisms,an alternative observable, the angular correlations between two mesons were investigated. Azimuthal correlations between pairs of heavy mesons, like $D$-$\bar{D}$ pairs, allow for distinguishing the energy-loss scenarios [2].

We continue these studies by investigating the angular correlations between pairs of heavy and light mesons ($D$ and $\pi$), originating from a heavy quark jet. This is motivated by the fact that the emitted gluon in radiative collisions hadronizes and these hadrons are correlated to the emitting heavy quark.

We created a Monte-Carlo code for the parton splitting in the vacuum together with an effective medium model. This program represents a consistent framework to study the influences of either collisional or radiative processes on parton propagation, and the resulting two-particle correlations. In order to learn at which stages of their space-time evolution jets are affected the most by interactions with the medium we studied contributions to angular correlations from different jet topologies.

[1] P. B. Gossiaux, J. Aichelin, T. Gousset and V. Guiho,
J. Phys. G 37 (2010) 094019
[arXiv:1001.4166 [hep-ph]].

[2] M. Nahrgang, J. Aichelin, P. B. Gossiaux and K. Werner,
J. Phys. Conf. Ser. 509 (2014) 012047
[arXiv:1310.2218 [hep-ph]].

Centralised submission by Collaboration Presenter name already specified Theory

### Primary author

Martin Rohrmoser (Jan-Kochanowski University Kielce)

### Co-authors

Pol Gossiaux (Subatech) joerg aichelin (Subatech/CNRS) Prof. Thierry Gousset (SUBATECH)