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Title: Measurement of jet fragmentation in PbPb and pp collisions at $$\sqrt{s_{NN}}=2.76$$ TeV

The jet fragmentation function of inclusive jets with transverse momentum pt above 100 GeV in PbPb collisions has been measured using reconstructed charged particles with pt above 1 GeV 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 sqrt(s[NN]) = 2.76 TeV corresponding to an integrated luminosity of 150 inverse microbarns 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 inverse picobarns. 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 pt less than 3 GeV. This enhancement is observed for all jet pt bins studied.
 [1] ;
  1. Yerevan Physics Institute (Armenia)
Publication Date:
OSTI Identifier:
Report Number(s):
CMS-HIN-12-013; CERN-PH-EP-2014-100; FERMILAB-PUB-14-217-CMS
Journal ID: ISSN 0556-2813; arXiv eprint number arXiv:1406.0932
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear physics; Journal Volume: 90; Journal Issue: 2
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States