Abstract
Collective flow and azimuthal correlation measurements of particles in the pT region ≲ 10 GeV provide valuable information in constraining the initial conditions and expansion dynamics of the system produced in heavy-ion collisions. ATLAS collaboration has recently measured correlations between flow harmonics in Pb+Pb collisions at = 2.76 TeV, using an event-shape selection procedure, and has separated the components arising from linear and non-linear hydrodynamic evolution in higher order harmonics (v4 and v5). A brief overview of these results are presented in these proceedings. Recently, azimuthal correlations extending to large pseudorapidity differences (“ridge”), similar to that seen in heavy-ion collisions, was observed in p+Pb collisions at LHC. These proceedings also present a measurement of the Fourier harmonics associated with the ridge correlations (v1 to v5) in p+Pb collisions at = 5.02 TeV by ATLAS collaboration. The results are compared with vn in Pb+Pb collisions at = 2.76 TeV with similar event multiplicities. Reasonable agreement is observed after accounting for the difference in the average pT of particles produced in the two collision systems, consistent with a recent hydrodynamic calculation.
Highlights
The particles produced in heavy-ion collisions at RHIC and LHC show azimuthal anisotropy that extend over large pseudorapidity (η) [1, 2]
Higher-order harmonics receive non-linear contributions from lower-order harmonics [5, 6]
Using an eventshape selection procedure, ATLA√S collaboration has measured the correlations between flow 28 harmonics in Pb+Pb collisions at sNN = 2.76 TeV
Summary
The particles produced in heavy-ion collisions at RHIC and LHC show azimuthal anisotropy that extend over large pseudorapidity (η) [1, 2]. Using an eventshape selection procedure, ATLA√S collaboration has measured the correlations between flow 28 harmonics in Pb+Pb collisions at sNN = 2.76 TeV. ATLAS collaboration has done a detailed measurement of the fi√rst five Fourier harmonics (v1 − v5) associated with the ridge correlations 37 in p+Pb collisions at sNN = 5.02 TeV. This proceedings discuss the ATLAS vn resu√lts in 38 p+Pb collisions. Reasonable agreement is observed after accounting for the difference in the average pT of particles produced in the two collision systems, consistent with a recent hydrodynamic calculation, suggesting a similar origin of these correlations in both systems. More results from the analysis along with a detailed description of the procedure and systematics can be found here [15]
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