In:
The European Physical Journal C, Springer Science and Business Media LLC, Vol. 80, No. 1 ( 2020-01)
Abstract:
The azimuthal anisotropy of charged particles produced in $$\sqrt{s_{\mathrm {NN}}}=8.16$$ s NN = 8.16 TeV p +Pb collisions is measured with the ATLAS detector at the LHC. The data correspond to an integrated luminosity of 165 $$\mathrm {nb}^{-1}$$ nb - 1 that was collected in 2016. Azimuthal anisotropy coefficients, elliptic $$v_2$$ v 2 and triangular $$v_3$$ v 3 , extracted using two-particle correlations with a non-flow template fit procedure, are presented as a function of particle transverse momentum ( $$p_\mathrm {T}$$ p T ) between 0.5 and 50 GeV. The $$v_2$$ v 2 results are also reported as a function of centrality in three different particle $$p_\mathrm {T}$$ p T intervals. The results are reported from minimum-bias events and jet-triggered events, where two jet $$p_\mathrm {T}$$ p T thresholds are used. The anisotropies for particles with $$p_\mathrm {T}$$ p T less than about 2 GeV are consistent with hydrodynamic flow expectations, while the significant non-zero anisotropies for $$p_\mathrm {T}$$ p T in the range 9–50 GeV are not explained within current theoretical frameworks. In the $$p_\mathrm {T}$$ 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.
Type of Medium:
Online Resource
ISSN:
1434-6044
,
1434-6052
DOI:
10.1140/epjc/s10052-020-7624-4
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
1397769-6
detail.hit.zdb_id:
1459069-4
Permalink