Measurement of Jet Fragmentation in PbPb and pp Collisions at $\sqrt{s_{NN}}= 2.76$ TeV - INSPIRE

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Measurement of Jet Fragmentation in PbPb and pp Collisions at $\sqrt{s_{NN}}= 2.76$ TeV

CMS

Collaboration

Jun 3, 2014

20 pages

Published in:

Phys.Rev.C 90 (2014) 2, 024908

Published: Aug 18, 2014

e-Print:

1406.0932 [nucl-ex]

DOI:

10.1103/PhysRevC.90.024908

Report number:

CMS-HIN-12-013,
CERN-PH-EP-2014-100

Experiments:

CERN-LHC-CMS

View in:

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Abstract: (APS)

The jet fragmentation function of inclusive jets with transverse momentum pT above 100GeV/c in PbPb collisions has been measured using reconstructed charged particles with pT above 1GeV/c 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 sNN=2.76TeV corresponding to an integrated luminosity of 150μb−1 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 5.3pb−1. 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 3GeV/c. This enhancement is observed for all jet pT bins studied.

Note:

Replaced with published version. Added journal reference and DOI

25.75.-q
13.87.Fh
jet: fragmentation function
jet: transverse momentum
jet: inclusive production
fragmentation function: ratio
p p: scattering
charged particle: transverse momentum
impact parameter: dependence
transverse momentum dependence

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