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

19-24 May 2014
Europe/Zurich timezone

## Jet fragmentation in lead-lead collisions at 2.76 TeV using the ATLAS detector at LHC

20 May 2014, 14:40
20m

### titanium

Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Jets

### Speaker

Martin Spousta (Columbia University and Charles University)

### Description

Measurements of charged particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions are expected to provide insight on the modification of parton showers in the hot and dense medium created in the collisions. ATLAS has measured jets at sqrt{sNN}=2.76 TeV in Pb+Pb collisions using data collected during 2011 run and in p+p collisions using 2013 run. Jets were reconstructed using the anti-kt algorithm with distance parameter values R=0.2, 0.3, and 0.4. Distributions of charged particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality. The ratios of fragmentation distributions with respect to the p+p reference fragmentation functions are evaluated. The jet structure is further investigated in terms of correlations of an angular position and momenta of a particle within jet.
On behalf of collaboration: ATLAS

### Primary author

Martin Spousta (Columbia University and Charles University)

 Slides