Random model of flow decorrelation

Abstract

The collective flow generated in relativistic heavy-ion collisions fluctuates from event to event. The fluctuations lead to a decorrelation of flow vectors measured in separate bins in phase space. These effects have been measured in experiments and observed in numerical simulations in hydrodynamic models. We present a simple random model of flow decorrelation in pseudorapidity. Analytical expressions for the flow factorization breaking coefficients for flow vectors, flow vector magnitudes, and flow angles are derived. The model explains the relations between different factorization breaking coefficients found in experimental data and model simulations. In particular, it is found that the flow angle decorrelation constitutes about one half of the total flow vector decorrelation.

References in corpus (11)

• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Hydrodynamic Models for Heavy Ion Collisions
• Breaking of factorization of two-particle correlations in hydrodynamics
• Forward-backward eccentricity and participant-plane angle fluctuations and their influences on longitudinal dynamics of collective flow
• Searches for $p_{\mathrm{T}}$ dependent fluctuations of flow angle and magnitude in Pb--Pb and p--Pb collisions
• Hydrodynamic modeling of pseudorapidity flow correlations in relativistic heavy-ion collisions and the torque effect
• Factorization breaking for higher moments of harmonic flow
• Effects of hydrodynamic and initial longitudinal fluctuations on rapidity decorrelation of collective flow
• Observation of flow angle and flow magnitude fluctuations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV at the CERN Large Hadron Collider
• Anisotropic flow decorrelation in heavy-ion collisions with event-by-event viscous hydrodynamics
• Effect of global momentum conservation on longitudinal flow decorrelation