Measurement of charged jet production cross sections and nuclear modification in p–Pb collisions at √ sNN = 5.02 TeV
Özet
Charged jet production cross sections in p-Pb collisions at root s(NN) =
5.02 TeV measured with the ALICE detector at the LHC are presented.
Using the anti-k(T) algorithm, jets have been reconstructed in the
central rapidity region from charged particles with resolution
parameters R = 0.2 and R = 0.4. The reconstructed jets have been
corrected for detector effects and the underlying event background. To
calculate the nuclear modification factor, R-pPb, of charged jets in
p-Pb collisions, a pp reference was constructed by scaling previously
measured charged jet spectra at root s = 7 TeV. In the transverse
momentum range 20 <= p(T, chjet) <= 120 GeV/c, R-pPb is found to be
consistent with unity, indicating the absence of strong nuclear matter
effects on jet production. Major modifications to the radial jet
structure are probed via the ratio of jet production cross sections
reconstructed with the two different resolution parameters. This ratio
is found to be similar to the measurement in pp collisions at root s = 7
TeV and to the expectations from PYTHIA pp simulations and NLO pQCD
calculations at root s(NN) = 5.02 TeV. (C) 2015 CERN for the benefit of
the ALICE Collaboration. Published by Elsevier B.V.
Koleksiyonlar
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