Measurement of long-range two-particle azimuthal correlations in Z-boson tagged pp collisions at root s=8 and 13 TeV
Volume
80
Publisher
DOI
10.1140/epjc/s10052-020-7606-6
Journal
EUROPEAN PHYSICAL JOURNAL C
Issue
ISSN
1434-6044
Metadata
Show full item recordAbstract
Results are presented from the measurement by ATLAS of long-range (|Δ𝜂|>2
|
Δ
η
|
>
2
) dihadron angular correlations in 𝑠√=8
s
=
8
and 13 TeV pp collisions containing a Z boson. The analysis is performed using 19.4 fb−1
f
b
−
1
of 𝑠√=8
s
=
8
TeV data recorded during Run 1 of the LHC and 36.1 fb−1
f
b
−
1
of 𝑠√=13
s
=
13
TeV data recorded during Run 2. Two-particle correlation functions are measured as a function of relative azimuthal angle over the relative pseudorapidity range 2<|Δ𝜂|<5
2
<
|
Δ
η
|
<
5
for different intervals of charged-particle multiplicity and transverse momentum. The measurements are corrected for the presence of background charged particles generated by collisions that occur during one passage of two colliding proton bunches in the LHC. Contributions to the two-particle correlation functions from hard processes are removed using a template-fitting procedure. Sinusoidal modulation in the correlation functions is observed and quantified by the second Fourier coefficient of the correlation function, 𝑣2,2
v
2
,
2
, which in turn is used to obtain the single-particle anisotropy coefficient 𝑣2
v
2
. The 𝑣2
v
2
values in the Z-tagged events, integrated over 0.5<𝑝T<5
0.5
<
p
T
<
5
GeV, are found to be independent of multiplicity and 𝑠√
s
, and consistent within uncertainties with previous measurements in inclusive pp collisions. As a function of charged-particle 𝑝T
p
T
, the Z-tagged and inclusive 𝑣2
v
2
values are consistent within uncertainties for 𝑝T<3
p
T
<
3
GeV.
Authors
Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, HCollections
- Particle Physics [965]
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Except where otherwise noted, this item's license is described as This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3
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