Regular Article - Experimental Physics
Azimuthal dependence of two-particle transverse momentum current correlations
Department of Physics, University of Illinois at Chicago, 60607, Chicago, IL, USA
2 Division of Particle Physics, Department of Physics, Lund University, Box 118, 221 00, Lund, Sweden
3 Department of Physics and Astronomy, Wayne State University, 48201, Detroit, MI, USA
4 Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
5 Department of Chemistry, State University of New York, 11794, Stony Brook, NY, USA
Accepted: 23 August 2021
Published online: 30 August 2021
Two-particle transverse momentum correlation functions are a powerful technique for understanding the dynamics of relativistic heavy-ion collisions. Among these, the transverse momentum correlator is of particular interest for its potential sensitivity to the shear viscosity per unit of entropy density of the quark-gluon plasma formed in heavy-ion collisions. We use the UrQMD, AMPT, and EPOS models for Au–Au at = 200 GeV and Pb–Pb at = 2760 GeV to investigate the long range azimuthal dependence of , and explore its utility to constrain based on charged particle correlations. We find that the three models yield quantitatively distinct transverse momentum Fourier harmonics coefficients . We also observe these coefficients exhibit a significant dependence on in the context of the AMPT model. These observations suggest that exhaustive measurements of the dependence of with collision energy, system size, collision centrality, in particular, offer the potential to distinguish between different theoretical models and their underlying assumptions. Exhaustive analyses of obtained in large and small systems should also be instrumental in establishing new constraints for precise extraction of .
© The Author(s) 2021
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