Longitudinal Decorrelation of Anisotropic Flows in Heavy-ion Collisions at the CERN Large Hadron Collider

Abstract

Fluctuations in the initial transverse energy-density distribution lead to anisotropic flows as observed in central high-energy heavy-ion collisions. Studies of longitudinal fluctuations of the anisotropic flows can shed further light on the initial conditions and dynamical evolution of the hot quark-gluon matter in these collisions. Correlations between anisotropic flows with varying pseudorapidity gaps in Pb+Pb collisions at the CERN Large Hadron Collider are investigated using both an event-by-event (3+1)-D ideal hydrodynamical model with fluctuating initial conditions and the a multiphase transport (AMPT) Monte Carlo model for high-energy heavy-ion collisions. Anisotropic flows at different pseudorapidities are found to become significantly decorrelated with increasing pseudo-rapidity gaps due to longitudinal fluctuations in the initial states of heavy-ion collisions. The longitudinal correlation of the elliptic flow shows a strong centrality dependence while the correlation of the triangular flow is independent of the centrality. Longitudinal fluctuations as a source of the decorrelation are further shown to consist of a twist or gradual rotation in flow angles between the forward and backward direction and additional fluctuations on top of the twist. Within the AMPT model, longitudinal correlations of anisotropic flows are also found to depend on the value of partonic cross sections. The implicatiosn of constraining the initial conditions and shear viscosity to entropy density ratio of the partonic matter in high-energy heavy-ion collisions are also discussed.

12 pages and 11 figures, final published version

References in corpus (14)

• Glauber Modeling in High Energy Nuclear Collisions
• Triangularity and Dipole Asymmetry in Heavy Ion Collisions
• Triangular flow in hydrodynamics and transport theory
• Effects of initial flow velocity fluctuation in event-by-event (3+1)D hydrodynamics
• Triangular flow in event-by-event ideal hydrodynamics in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200A$ GeV
• Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions
• Elliptic and triangular flow in p+Pb and peripheral Pb+Pb collisions from parton scatterings
• Eccentric protons? Sensitivity of flow to system size and shape in p+p, p+Pb and Pb+Pb collisions
• Jets, Mach cone, hot spots, ridges, harmonic flow, dihadron and $\gamma$-hadron correlation in high-energy heavy-ion collisions
• Forward-backward eccentricity and participant-plane angle fluctuations and their influences on longitudinal dynamics of collective flow
• The effect of triangular flow on di-hadron azimuthal correlations in relativistic heavy ion collisions
• Equation of state of the hot dense matter in a multi-phase transport model
• Exposing the Noncollectivity in Elliptic Flow
• Forward-backward elliptic anisotropy correlation in parton cascade

Cited by in corpus (17)

• A collision geometry-based 3D initial condition for relativistic heavy-ion collisions
• Rapidity decorrelation of anisotropic flow caused by hydrodynamic fluctuations
• Hydrodynamic modeling of pseudorapidity flow correlations in relativistic heavy-ion collisions and the torque effect
• Different Realizations of Cooper-Frye Sampling with Conservation Laws
• Factorization breaking for higher moments of harmonic flow
• Effects of hydrodynamic and initial longitudinal fluctuations on rapidity decorrelation of collective flow
• Measuring differential flow angle fluctuations in relativistic nuclear collisions
• Particle productions and anisotropic flows from the AMPT model for Cu+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Checking Non-Flow Assumptions and Results via PHENIX Published Correlations in $p$$+$$p$, $p$$+$Au, $d$$+$Au, ${}^3$He$+$Au at $\sqrt{s_{NN}}$ = 200 GeV
• Anisotropic flow decorrelation in heavy-ion collisions with event-by-event viscous hydrodynamics
• Investigations on mixed harmonic cumulants in heavy-ion collisions at the LHC
• Splitting of elliptic flow in a tilted fireball
• Collective flow and hydrodynamics in large and small systems at the LHC
• Flow-plane decorrelations in heavy-ion collisions with multiple-plane cumulants
• Effect of global momentum conservation on longitudinal flow decorrelation
• Rapidity dependence of mean transverse momentum fluctuation and decorrelation in baryon-dense medium
• Intrinsic coupling between transverse spherocity and elliptic flow in heavy-ion collisions