Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2015). Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2015(9), Article 170. https://doi.org/10.1007/JHEP09(2015)170
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Journal of High Energy PhysicsAuthors
Date
2015Copyright
© 2015 CERN, for the benefit of the ALICE Collaboration. This is an open access article funded by SCOAP3.
We report the measurement of a new observable of jet quenching in central
Pb-Pb collisions at √
sNN = 2.76 TeV, based on the semi-inclusive rate of charged jets
recoiling from a high transverse momentum (high-pT) charged hadron trigger. Jets are
measured using collinear-safe jet reconstruction with infrared cutoff for jet constituents of
0.15 GeV, for jet resolution parameters R = 0.2, 0.4 and 0.5. Underlying event background
is corrected at the event-ensemble level, without imposing bias on the jet population. Recoil
jet spectra are reported in the range 20 < pch
T,jet < 100 GeV. Reference distributions for pp
collisions at √
s = 2.76 TeV are calculated using Monte Carlo and NLO pQCD methods,
which are validated by comparing with measurements in pp collisions at √
s = 7 TeV.
The recoil jet yield in central Pb-Pb collisions is found to be suppressed relative to that
in pp collisions. No significant medium-induced broadening of the intra-jet energy profile
is observed within 0.5 radians relative to the recoil jet axis. The angular distribution of
the recoil jet yield relative to the trigger axis is found to be similar in central Pb-Pb and
pp collisions, with no significant medium-induced acoplanarity observed. Large-angle jet
deflection, which may provide a direct probe of the nature of the quasi-particles in hot
QCD matter, is explored.
...
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Springer Berlin HeidelbergISSN Search the Publication Forum
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Except where otherwise noted, this item's license is described as © 2015 CERN, for the benefit of the ALICE Collaboration. This is an open access article funded by SCOAP3.
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