Fourier coefficients of noninterdependent collective motions in heavy-ion collisions

Abstract

We present a scenario in heavy-ion collisions where different modes of collective motions are noninterdependent, driven by factorized actions in the created nuclear medium. Such physics mechanisms could each dominate at a distinct evolution stage, or coexist simultaneously. If the probability of particle emission is modulated by each nondependent collective motion with a single-harmonic Fourier expansion, the particle azimuthal distribution should be the product of all these expansions. Consequently, nonleading cross terms between collectivity modes appear, and their contributions to experimental observables could be significant. In particular, we argue that the chiral magnetic effect (CME) and elliptic flow can develop separately, with their convolution affecting the observable that is sensitive to the shear-induced CME. We will use the event-by-event anomalous-viscous fluid dynamics model to illustrate the effects of this scenario. Besides giving insights into searches for the CME, we also propose feasible experimental tests based on conventional flow harmonics, and demonstrate the emergence of nonleading cross terms with a multiphase transport model.

References in corpus (4)

• Directed flow in ultrarelativistic heavy-ion collisions
• Breaking of factorization of two-particle correlations in hydrodynamics
• Evolution of transverse flow and effective temperatures in the parton phase from a multi-phase transport model
• Shear-induced anomalous transport and charge asymmetry of triangular flow in heavy-ion collisions

Cited by in corpus (1)

• Search for the chiral magnetic effect through beam energy dependence of charge separation using event shape selection