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Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au+Au collisions at sNN =200 GeV

Adamczyk L.
•
Adkins J. K.
•
Agakishiev G.
altro
Zyzak M.
2017
  • journal article

Periodico
PHYSICAL REVIEW C
Abstract
The STAR Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high transverse momentum hadron trigger, in central and peripheral Au+Au collisions at sNN=200 GeV. Charged jets are reconstructed with the anti-kT algorithm for jet radii R between 0.2 and 0.5 and with low infrared cutoff of track constituents (pT>0.2 GeV/c). A novel mixed-event technique is used to correct the large uncorrelated background present in heavy ion collisions. Corrected recoil jet distributions are reported at midrapidity, for charged-jet transverse momentum pT,jetch<30 GeV/c. Comparison is made to similar measurements for Pb+Pb collisions at s=2.76 TeV, to calculations for p+p collisions at s=200 GeV based on the pythia Monte Carlo generator and on a next-to-leading order perturbative QCD approach, and to theoretical calculations incorporating jet quenching. The recoil jet yield is suppressed in central relative to peripheral collisions, with the magnitude of the suppression corresponding to medium-induced charged energy transport out of the jet cone of 2.8±0.2(stat)±1.5(sys) GeV/c, for 10<20 GeV/c and R=0.5. No medium-induced change in jet shape is observed for R<0.5. The azimuthal distribution of low-pT,jetch recoil jets may be enhanced at large azimuthal angles to the trigger axis, due to scattering off quasiparticles in the hot QCD medium. Measurement of this distribution gives a 90% statistical confidence upper limit to the yield enhancement at large deflection angles in central Au+Au collisions of 50±30(sys)% of the large-angle yield in p+p collisions predicted by pythia.
DOI
10.1103/PhysRevC.96.024905
WOS
WOS:000407551700003
Archivio
http://hdl.handle.net/11368/2945826
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85028743935
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.024905
Diritti
closed access
license:copyright editore
FVG url
https://arts.units.it/request-item?handle=11368/2945826
Soggetti
  • jet

  • heavy-ions

Scopus© citazioni
60
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
52
Data di acquisizione
Mar 26, 2024
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