@misc{10481/58427,
year = {2019},
month = {12},
url = {http://hdl.handle.net/10481/58427},
abstract = {Studies of the fragmentation of jets into charged particles in heavy-ion collisions can provide information
about the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quarkgluon
plasma. This paper presents a measurement of the angular distribution of charged particles around the jet
axis in
√
sNN = 5.02 TeV Pb + Pb and pp collisions, using the ATLAS detector at the LHC. The Pb + Pb and
pp data sets have integrated luminosities of 0.49 nb−1 and 25 pb−1, respectively. The measurement is performed
for jets reconstructed with the anti-kt algorithm with radius parameter R = 0.4 and is extended to an angular
distance of r = 0.8 from the jet axis. Results are presented as a function of Pb + Pb collision centrality and
distance from the jet axis for charged particles with transverse momenta in the 1- to 63-GeV range, matched to
jets with transverse momenta in the 126- to 316-GeV range and an absolute value of jet rapidity of less than 1.7.
Modifications to the measured distributions are quantified by taking a ratio to the measurements in pp collisions.
Yields of charged particles with transverse momenta below 4 GeV are observed to be increasingly enhanced as a
function of angular distance from the jet axis, reaching a maximum at r = 0.6. Charged particles with transverse
momenta above 4 GeV have an enhanced yield in Pb + Pb collisions in the jet core for angular distances up to
r = 0.05 from the jet axis, with a suppression at larger distances.},
organization = {We thank CERN for the very successful operation of the
LHC. We acknowledge the support of ANPCyT, Argentina;
YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria;
ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP,
Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT,
Chile; CAS, MOST, and NSFC, China; COLCIENCIAS,
Colombia; MSMT CR, MPO CR, and VSC CR, Czech Republic;
DNRF and DNSRC, Denmark; IN2P3-CNRS, CEADRF/
IRFU, France; SRNSFG, Georgia; BMBF, HGF, and
MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR,
China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT
and JSPS, Japan; CNRST, Morocco; NWO, Netherlands;
RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal;
MNE/IFA, Romania; MES of Russia and NRC KI, Russian
Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS
and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO,
Spain; SRC and Wallenberg Foundation, Sweden; SERI,
SNSF, and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; and DOE
and NSF, United States of America. In addition, individual
groups and members have received support from BCKDF,
CANARIE, CRC, and Compute Canada, Canada; COST,
ERC, ERDF, Horizon 2020, and Marie Skłodowska-Curie
Actions, European Union; Investissements d’ Avenir Labex
and Idex, ANR, France; DFG and AvH Foundation, Germany;
Herakleitos, Thales, and Aristeia programmes cofinanced by
EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF,
Israel; CERCA Programme Generalitat de Catalunya, Spain; and the Royal Society and Leverhulme Trust, United Kingdom.},
publisher = {American Physical Society},
title = {Measurement of angular and momentum distributions of charged particles within and around jets in Pb + Pb and pp collisions at √ sNN = 5.02 TeV with the ATLAS detector},
doi = {10.1103/PhysRevC.100.064901},
author = {Aad, G. and Aguilar Saavedra, Juan Antonio and Atlas Collaboration},
}