Abstract
Measurements of the suppression and correlations of dijets is performed using
3
µ
b
−
1
of Xe+Xe data at
√
s
N
N
=
5.44
TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Dijets with jets reconstructed using the
R
=
0.4
anti-
k
t
algorithm are measured differentially in jet
p
T
over the range of 32 to 398 GeV and the centrality of the collisions. Significant dijet momentum imbalance is found in the most central Xe+Xe collisions, which decreases in more peripheral collisions. Results from the measurement of per-pair normalized and absolutely normalized dijet
p
T
balance are compared with previous
Pb
+
Pb
measurements at
√
s
N
N
=
5.02
TeV. The differences between the dijet suppression in Xe+Xe and
Pb
+
Pb
are further quantified by the ratio of pair nuclear-modification factors. The results are found to be consistent with those measured in
Pb
+
Pb
data when compared in classes of the same event activity and when taking into account the difference between the center-of-mass energies of the initial parton scattering process in Xe+Xe and
Pb
+
Pb
collisions. These results should provide input for a better understanding of the role of energy density, system size, path length, and fluctuations in the parton energy loss.
