The jet fragmentation function of inclusive jets with transverse momentum p(T) above 100 GeV/c in PbPb collisions has been measured using reconstructed charged particles with p(T) above 1 GeV/c in a cone of radius 0.3 around the jet axis. A data sample of PbPb collisions collected in 2011 at a nucleon-nucleon center-of-mass energy of root s(NN) = 2.76 TeV corresponding to an integrated luminosity of 150 mu b(-1) is used. The results for PbPb collisions as a function of collision centrality and jet transverse momentum are compared to reference distributions based on pp data collected at the same center-of-mass energy in 2013, with an integrated luminosity of 5.3 pb(-1). A centrality-dependent modification of the fragmentation function is found. For the most central collisions, a significant enhancement is observed in the PbPb/pp fragmentation function ratio for charged particles with p(T) less than 3 GeV/c. This enhancement is observed for all jet p(T) bins studied.

S., C., V., K., A. M., S., A., T., W., A., T., B., et al. (2014). Measurement of jet fragmentation in PbPb and pp collisions at root s(NN)=2.76 TeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 90(2) [10.1103/PhysRevC.90.024908].

Measurement of jet fragmentation in PbPb and pp collisions at root s(NN)=2.76 TeV

CIOCCI, MARIA AGNESE;