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
英文:
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
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 Δ?, 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(2Δ?), modulation observed in a previous measurement, the pp correlation functions exhibit significant cos(3Δ?) and cos(4Δ?) modulation. The Fourier coefficients vn,n associated with the cos(nΔ?) 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, 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
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