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Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at √sNN = 2.76 TeV

The ALICE collaboration, Null
•
Adam, J.
•
Adamová, D.
altro
Zyzak, M.
2015
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
We report the measurement of a new observable of jet quenching in centralvPb-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 < 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.
DOI
10.1007/JHEP09(2015)170
WOS
WOS:000362274600001
Archivio
http://hdl.handle.net/11368/2866027
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84943167400
http://link.springer.com/journal/13130
Diritti
open access
license:digital rights management non definito
FVG url
https://arts.units.it/bitstream/11368/2866027/2/Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at â sNN = 2.76 TeV.pdf
Soggetti
  • Heavy Ion

  • Jet physic

  • Quark gluon plasma

  • Nuclear and High Ener...

Scopus© citazioni
66
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
88
Data di acquisizione
Mar 23, 2024
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