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

Journal Article · Fri Aug 01 00:00:00 EDT 2014 · Physical Review. C, Nuclear physics

DOI:https://doi.org/10.1103/PhysRevC.90.024908· OSTI ID:1186076

Chatrchyan, Serguei ^[1]; et al.,

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1. Yerevan Physics Institute (Armenia)

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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: CMS Collaboration
• OSTI ID: 1186076
• Report Number(s): CMS-HIN-12-013; CERN-PH-EP-2014-100; FERMILAB-PUB-14-217-CMS; arXiv eprint number arXiv:1406.0932
• Journal Information: Physical Review. C, Nuclear physics, Vol. 90, Issue 2; ISSN 0556-2813
• Country of Publication: United States
• Language: English