
Measurements of longrange azimuthal anisotropies and associated Fourier coefficients for pp collisions at √ s = 5 . 02 and 13 TeV and p + Pb collisions at √ s NN = 5 . 02 TeV with the ATLAS detectorMeasurements of longrange azimuthal anisotropies and associated Fourier coefficients for pp collisions at √ s = 5 . 02 and 13 TeV and p + Pb collisions at √ s NN = 5 . 02 TeV with the ATLAS detectorAA00773613 
"/ATLAS Collaboration/"ATLAS Collaboration ,
"/Hara, K./"Hara, K. ,
"/Kim, S.H./"Kim, S.H. ,
"/Okawa, H./"Okawa, H. ,
"/Sato, K./"Sato, K. ,
"/Ukegawa, F./"Ukegawa, F.
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, p.24908 , 201708 , American Physical Society
ISSN:24699985
NCID:AA00773613
Description
ATLAS measurements of twoparticle 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 longrange component of the correlation function, with Δη>2, is studied using a template fitting procedure to remove a “backtoback” contribution to the correlation function that primarily arises from hardscattering 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 chargedparticle multiplicity and chargedparticle transverse momentum. The Fourier coefficients are observed to be compatible with cos(nϕ) modulation of perevent singleparticle azimuthal angle distributions. The singleparticle Fourier coefficients vn are measured as a function of chargedparticle multiplicity, and chargedparticle 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.
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