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Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at vs=5.02 and 13 TeV and p+Pb collisions at vsNN=5.02 TeV with the ATLAS detector

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journal contribution
posted on 2023-06-09, 08:42 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS Collaboration and
ATLAS measurements of two-particle correlations are presented for vs=5.02 and 13 TeV ppcollisions and for vsNN=5.02 TeV p+Pb collisions at the LHC. The correlation functions are measured as a function of relative azimuthal angle ??, and pseudorapidity separation ??, using charged particles detected within the pseudorapidity interval |?|<2.5. Azimuthal modulation in the long-range component of the correlation function, with |??|>2, is studied using a template fitting procedure to remove a “back-to-back” contribution to the correlation function that primarily arises from hard-scattering processes. In addition to the elliptic, cos (2??), modulation observed in a previous measurement, the pp correlation functions exhibit significant cos (3??) and cos (4??) modulation. The Fourier coefficients vn, n associated with the cos (n??) modulation of the correlation functions for n=2–4 are measured as a function of charged-particle multiplicity and charged-particle transverse momentum. The Fourier coefficients are observed to be compatible with cos (n?) modulation of per-event single-particle azimuthal angle distributions. The single-particle Fourier coefficients vn are measured as a function of charged-particle multiplicity, and charged-particle transverse momentum for n=2–4. The integrated luminosities used in this analysis are, 64nb-1 for the vs=13 TeV pp data, 170 nb-1 for the v s = 5.02 TeV pp data, and 28 nb-1 for the vsNN = 5.02 TeV p+Pb data.

Funding

ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review C

ISSN

2469-9985

Publisher

American Physical Society

Issue

2

Volume

96

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-11-07

First Open Access (FOA) Date

2017-11-07

First Compliant Deposit (FCD) Date

2017-11-07

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