Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector - INSPIRE

DataBETA

Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$ +Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector

ATLAS

Collaboration

Sep 20, 2016

37 pages

Published in:

Phys.Rev.C 96 (2017) 2, 024908

Published: Aug 22, 2017 by APS

e-Print:

1609.06213 [nucl-ex]

DOI:

10.1103/PhysRevC.96.024908

Report number:

CERN-EP-2016-200

Experiments:

CERN-LHC-ATLAS

View in:

reference search182 citations

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Abstract: (APS)

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.

Note:

57 pages in total, author list starting page 41, 19 figures, 4 tables, published in Physical Review C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2016-01. This version matches the publication

charged particle: transverse momentum
charged particle: multiplicity
p p: scattering
correlation: two-particle
angular distribution: anisotropy
correlation function
correlation: long-range
modulation
rapidity
heavy ion: scattering

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Figures(19)

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