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Measurement of jet fragmentation in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV

Abstract : 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.
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http://hal.in2p3.fr/in2p3-01001821
Contributor : Sylvie Flores <>
Submitted on : Thursday, June 5, 2014 - 7:34:48 AM
Last modification on : Tuesday, November 24, 2020 - 8:08:34 AM

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S. Chatrchyan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Measurement of jet fragmentation in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV. Physical Review C, American Physical Society, 2014, 90, pp.024908. ⟨10.1103/PhysRevC.90.024908⟩. ⟨in2p3-01001821⟩

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