12-18 August 2012
US/Eastern timezone

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

15 Aug 2012, 09:50
20m
Palladian

Palladian

Speaker

Frank Ma (Massachusetts Inst. of Technology (US))

Description

The jet fragmentation function of inclusive jets with pT > 100 GeV/c in PbPb collisions is measured for reconstructed charged particles with pT > 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 Lint = 129 μb−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. For the most central collisions a significant rise of the PbPb/pp fragmentation function ratio for the softest fragmentation products with pT < 3 GeV/c is observed.

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