# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## Universal scaling dependence of QCD energy loss from data-driven studies

20 May 2014, 16:30
2h

Board: E-36
Poster Jets

### Speaker

Vytautas Vislavicius (Lund University (SE))

### Description

In Pb-Pb collisions a dense partonic state of matter, the Quark Gluon Plasma, is formed. Jets created in a collision probe the medium, but so far the experimental results on jet quenching cannot be reproduced theoretically: existing QCD models fail to describe both $R_{\text{AA}}$ and $v_{\text{2}}$ consistently at high $p_{T}$. In this talk a data driven study using Glauber simulations for the initial geometry is presented. We find that the energy loss depends linearly on the initial path length (RMS) and as square root of the initial density. Surprisingly, the density scaling found for LHC data also explains the RHIC data. Finally, the possible implications of these results for a full theoretical modeling are discussed.

### Primary authors

Dr Konrad Tywoniuk (Universitat de Barcelona) Peter Christiansen (Lund University (SE)) Vytautas Vislavicius (Lund University (SE))

 Poster