Transverse momentum and process dependent azimuthal anisotropies in root S-NN=8.16 TeV p plus Pb collisions with the ATLAS detector
Volume
80
Publisher
DOI
10.1140/epjc/s10052-020-7624-4
Journal
EUROPEAN PHYSICAL JOURNAL C
Issue
ISSN
1434-6044
Metadata
Show full item recordAbstract
The azimuthal anisotropy of charged particles produced in 𝑠NN‾‾‾‾√=8.16
s
N
N
=
8.16
TeV p+Pb collisions is measured with the ATLAS detector at the LHC. The data correspond to an integrated luminosity of 165 nb−1
n
b
−
1
that was collected in 2016. Azimuthal anisotropy coefficients, elliptic 𝑣2
v
2
and triangular 𝑣3
v
3
, extracted using two-particle correlations with a non-flow template fit procedure, are presented as a function of particle transverse momentum (𝑝T
p
T
) between 0.5 and 50 GeV. The 𝑣2
v
2
results are also reported as a function of centrality in three different particle 𝑝T
p
T
intervals. The results are reported from minimum-bias events and jet-triggered events, where two jet 𝑝T
p
T
thresholds are used. The anisotropies for particles with 𝑝T
p
T
less than about 2 GeV are consistent with hydrodynamic flow expectations, while the significant non-zero anisotropies for 𝑝T
p
T
in the range 9–50 GeV are not explained within current theoretical frameworks. In the 𝑝T
p
T
range 2–9 GeV, the anisotropies are larger in minimum-bias than in jet-triggered events. Possible origins of these effects, such as the changing admixture of particles from hard scattering and the underlying event, are discussed.
Authors
Aaboud, M; Aad, G; Abbott, B; Abbott, DC; Abdinov, O; Abud, AA; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NLCollections
- Particle Physics [971]
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