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

, The ATLAS collaboration (2017) Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at √s = 5.02 and 13 TeV and p + Pb collisions at √sNN = 5.02 TeV with the ATLAS detector. Physical Review C, 96 (2). ISSN 0556-2813

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Abstract

ATLAS measurements of two-particle correlations are presented for √s =5.02 and 13 TeV pp collisions and for √sNN =5.02 TeV p+Pb collisions at the LHC. The correlation functions are measured as a function of relative azimuthal angle Δϕ, and pseudorapidity separation Δη, using charged particles detected within the pseudorapidity interval |η|<2.5. Azimuthal modulation in the long-range component of the correlation function, with |Δη|>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(2Δϕ), modulation observed in a previous measurement, the pp correlation functions exhibit significant cos(3Δϕ) and cos(4Δϕ) modulation. The Fourier coefficients vn,n associated with the cos(nΔϕ) 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(nϕ) 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, 64 nb−1 for the √s =13 TeV pp data, 170 nb−1 for the √s =5.02 TeV pp data, and 28 nb−1 for the √sNN =5.02 TeV p+Pb data.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review C
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
88826
Deposited By:
Deposited On:
20 Nov 2017 21:30
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 07:38