Transverse momentum and process dependent azimuthal anisotropies in √sNN=8.16 TeV p+Pb collisions with the ATLAS detector

ATLAS Collaboration, Paul Newman

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4 Citations (Scopus)
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The azimuthal anisotropy of charged particles produced in √sNN=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 that was collected in 2016. Azimuthal anisotropy coefficients, elliptic v 2 and triangular v 3, extracted using two-particle correlations with a non-flow template fit procedure, are presented as a function of particle transverse momentum (p T) between 0.5 and 50 GeV. The v 2 results are also reported as a function of centrality in three different particle p T intervals. The results are reported from minimum-bias events and jet-triggered events, where two jet p T thresholds are used. The anisotropies for particles with p T less than about 2 GeV are consistent with hydrodynamic flow expectations, while the significant non-zero anisotropies for p T in the range 9–50 GeV are not explained within current theoretical frameworks. In the 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.

Original languageEnglish
Article number73
JournalEur. Phys. J. C
Issue number1
Publication statusPublished - 30 Jan 2020

Bibliographical note

43 pages in total, author list starting page 27, 12 figures, 2 tables, published on EPJC. All figures including auxiliary figures are available at


  • nucl-ex
  • hep-ex

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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