Mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 and 5.02 TeV

Abstract

Anisotropies in the initial energy density distribution of the quark-gluon plasma created in high energy heavy ion collisions lead to anisotropies in the azimuthal distributions of the final-state particles known as collective flow. Fourier harmonic decomposition is used to quantify these anisotropies. The higher-order harmonics can be induced by the same order anisotropies (linear response) or by the combined influence of several lower order anisotropies (nonlinear response) in the initial state. The mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles are measured as functions of transverse momentum and centrality in PbPb collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_{\mathrm{NN}}}=$ 2.76 and 5.02 TeV with the CMS detector. The results are compared with viscous hydrodynamic calculations using several different initial conditions, as well as microscopic transport model calculations. None of the models provides a simultaneous description of the mixed higher-order flow harmonics and nonlinear response coefficients.

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• A method to test the coupling strength of the linear and nonlinear contributions to higher-order flow harmonics via Event Shape Engineering
• Extracting the speed of sound in quark-gluon plasma with ultrarelativistic lead-lead collisions at the LHC
• Collision-System and Beam-Energy Dependence of Anisotropic Flow Fluctuations
• Beam energy dependence of the linear and mode-coupled flow harmonics in Au+Au collisions
• Probing QGP with flow: An experimental overview
• A model investigation of the longitudinal broadening of the transverse momentum two-particle correlator
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• Azimuthal dependence of two-particle transverse momentum current correlations
• Beam Energy Dependence of the Linear and Mode-Coupled Flow Harmonics Using the A Multi-Phase Transport Model
• Bayesian reconstruction of anisotropic flow fluctuations at fixed impact parameter
• Flow harmonics in heavy ion physics at CMS and ATLAS
• Measurements of mixed harmonic cumulants in Pb-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}=5.02$ TeV
• Measuring differential particle correlations in relativistic nuclear collisions
• Investigations of the linear and non-linear flow harmonics using the A Multi-Phase Transport model