Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and pp collisions at root s(NN)=5.02 TeV with the ATLAS detector
Volume
100
Publisher
DOI
10.1103/PhysRevC.100.064901
Journal
PHYSICAL REVIEW C
Issue
ISSN
2469-9985
Metadata
Show full item recordAbstract
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 quark-gluon plasma. This paper presents a measurement of the angular distribution of charged particles around the jet axis in
√
s
N
N
=
5.02
TeV
Pb
+
Pb
and pp collisions, using the ATLAS detector at the LHC. The
Pb
+
Pb
and
p
p
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-
k
t
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
p
p
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.
Authors
Aad, G; Abbott, B; Abbott, DC; Abud, AA; Abeling, K; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, HCollections
- Particle Physics [965]
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