Azimuthal anisotropies of charged particles with high transverse momentum in Pb + Pb collisions at $$\sqrt{s_{\textrm{NN}}}$$ = 5.02 TeV with the ATLAS detector
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- Shanghai Jiao Tong University; Tsung-Dao Lee Institute
A measurement is presented of elliptic (𝑣2) and triangular (𝑣3) azimuthal anisotropy coefficients for charged particles produced in Pb + Pb collisions at $$\sqrt{s_{\textrm{NN}}}$$ = 5.02 TeV using a dataset corresponding to an integrated luminosity of 0.44nb−1 collected with the ATLAS detector at the LHC in 2018. The values of 𝑣2 and 𝑣3 are measured for charged particles over a wide range of transverse momentum (𝑝T), 1–400 GeV, and Pb + Pb collision centrality, 0–60%, using the scalar-product and multiparticle cumulant methods. These methods are sensitive to event-by-event fluctuations and nonflow effects in the measurements of azimuthal anisotropies. Positive values of 𝑣2 are observed up to a 𝑝T of approximately 100 GeV from both methods across all centrality intervals. Positive values of 𝑣3 are observed up to approximately 25 GeV using both methods, though the application of the three-subevent technique to the multiparticle cumulant method leads to significant changes at the highest 𝑝T. At high 𝑝T (𝑝T ⪆ 10 GeV), charged particles are dominantly from jet fragmentation. These jets, and hence the measurements presented here, are sensitive to the path-length dependence of parton energy loss in the quark-gluon plasma produced in Pb + Pb collisions.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; FG02-03ER41244
- OSTI ID:
- 3020382
- Journal Information:
- Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 112; ISSN 2469-9985; ISSN 2469-9993
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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