Jet fragmentation functions in PbPb and pp collisions at 2.76 TeV with CMS

[摘要] The jet fragmentation function of inclusive jets with p[subscript T] > 100 GeV/c in PbPb collisions is measured for reconstructed charged particles with p[subscript T] > 1 GeV/c within the jet cone. A data sample of PbPb collisions collected in 2011 at a center-of-mass energy of √sNN = 2.76 TeV corresponding to an integrated luminosity of 129μb[superscript −1] is used. The results for PbPb collisions as a function of collision centrality are compared to reference distributions based on pp data collected at the same collision energy. A centrality-ordered modification of the fragmentation function is revealed. For the most central collisions a significant rise of the PbPb/pp fragmentation function ratio for the softest fragmentation products with p[subscript T] < 3 GeV/c is observed.

[发布机构] Elsevier