Measurement of charged jet suppression in Pb-Pb collisions at root s(NN)=2.76 TeV
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and Zichichi, A. and Zimmermann, A. and Zimmermann, M. B. and Zinovjev,
G. and Zoccarato, Y. and Zynovyev, M. and Zyzak, M.... Show more Show less
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Abstract
A measurement of the transverse momentum spectra of jets in Pb-Pb
collisions at root s(NN) = 2.76 TeV is reported. Jets are reconstructed
from charged particles using the anti-k(T) jet algorithm with jet
resolution parameters R of 0.2 and 0.3 in pseudorapidity vertical bar
eta vertical bar < 0.5. The transverse momentum p(T) of charged
particles is measured down to 0.15 GeV/c which gives access to the low
p(T) fragments of the jet. Jets found in heavy-ion collisions are
corrected event-by-event for average background density and on an
inclusive basis (via unfolding) for residual background fluctuations and
detector effects. A strong suppression of jet production in central
events with respect to peripheral events is observed. The suppression is
found to be similar to the suppression of charged hadrons, which
suggests that substantial energy is radiated at angles larger than the
jet resolution parameter R = 0.3 considered in the analysis. The
fragmentation bias introduced by selecting jets with a high p(T) leading
particle, which rejects jets with a soft fragmentation pattern, has a
similar effect on the jet yield for central and peripheral events. The
ratio of jet spectra with R = 0.2 and R = 0.3 is found to be similar in
Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of
the radial jet structure in the reconstructed jets with R < 0.3.... Show more Show less