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

May 20, 2014, 2:40 PM
titanium (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Jets Jets


Martin Spousta (Columbia University and Charles University)


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)

Presentation materials