Transverse momentum and process dependent azimuthal anisotropies in √<i>S</i><sub>NN</sub>=8.16 TeV <i>p</i> plus Pb collisions with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2901 more authors) (2020) Transverse momentum and process dependent azimuthal anisotropies in √<i>S</i><sub>NN</sub>=8.16 TeV <i>p</i> plus Pb collisions with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 80 (1). 73-.

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Abstract

The azimuthal anisotropy of charged particles produced in $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV $p$+Pb collisions is measured with the ATLAS detector at the LHC. The data correspond to an integrated luminosity of $165$ $\mathrm{nb}^{-1}$ 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 ($p_\mathrm{T}$) between $0.5$ and $50$ GeV. The $v_2$ results are also reported as a function of centrality in three different particle $p_\mathrm{T}$ intervals. The results are reported from minimum-bias events and jet-triggered events, where two jet $p_\mathrm{T}$ thresholds are used. The anisotropies for particles with $p_\mathrm{T}$ less than about $2$ GeV are consistent with hydrodynamic flow expectations, while the significant non-zero anisotropies for $p_\mathrm{T}$ in the range $9$-$50$ GeV are not explained within current theoretical frameworks. In the $p_\mathrm{T}$ 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.

Item Type: Article
Additional Information: 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-2018-20
Uncontrolled Keywords: nucl-ex, nucl-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 27 Feb 2020 17:35
Last Modified: 14 Oct 2023 16:32
DOI: 10.1140/epjc/s10052-020-7624-4
Open Access URL: https://link.springer.com/article/10.1140%2Fepjc%2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3076303