Jet fragmentation functions in PbPb and pp collisions at 2.76 TeV with CMS
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Nuclear Physics A
Ma, Frank. “Jet Fragmentation Functions in PbPb and Pp Collisions at 2.76 TeV with CMS.” Nuclear Physics A 904–905 (May 2013): 740c–743c. © CERN for the benefit of the CMS Collaboration
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