Abstract
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 language | English |
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Article number | 73 |
Journal | Eur. Phys. J. C |
Volume | 80 |
Issue number | 1 |
DOIs | |
Publication status | Published - 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 http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-20Keywords
- nucl-ex
- hep-ex
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)