Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at root s(NN)=2.76 and 5.02 TeV with the ATLAS detector

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Author
Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; ...Date
2018-02-19Source Title
European Physical Journal C: Particles and FieldsPublisher
SPRINGERUniversity of Melbourne Author/s
Milesi, Marco; Urquijo, Phillip; Taylor, Geoffrey; Nuti, Francesco; Barberio, Luigia; Brennan, Amelia; Kubota, Takashi; Rados, Pere; Scutti, Federico; Ungaro, Francesca Consiglia; ...Affiliation
School of PhysicsMetadata
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Journal ArticleCitations
Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adye, T., Affolder, A. A. ,... Zwalinski, L. (2018). Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at root s(NN)=2.76 and 5.02 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 78 (2), https://doi.org/10.1140/epjc/s10052-018-5605-7.Access Status
Open AccessAbstract
Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range
|
η
|
<
2.4
using 7 and 470
μ
b
-
1
of Pb+Pb collisions at
s
NN
=
2.76
and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients
v
n
measured in two separated
η
intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the
η
separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the
k
th
-moment of the
v
n
are found to be proportional to k for
v
3
, but not for
v
2
. The decorrelation effect is separated into contributions from the magnitude of
v
n
and the event-plane orientation, each as a function of
η
. These two contributions are found to be comparable. The longitudinal flow correlations are also measured between
v
n
of different order in n. The decorrelations of
v
2
and
v
3
are found to be independent of each other, while the decorrelations of
v
4
and
v
5
are found to be driven by the nonlinear contribution from
v
2
2
and
v
2
v
3
, respectively.
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