New method for measuring longitudinal fuctuations and directed flow in ultrarelativistic heavy ion reactions

Abstract

It has been shown in recent ALICE@LHC measurements that the odd flow harmonics, in particular a directed flow, v1, occurred to be weak and dominated by random fluctuations. In this work we propose a new method, which makes the measurements more sensitive to the flow patterns showing global collective symmetries. We demonstrate how the longitudinal center of mass rapidity fluctuations can be identified, and then the collective flow analysis can be performed in the event-by-event center of mass frame. Such a method can be very effective in separating the flow patterns originating from random fluctuations, and the flow patterns originating from the global symmetry of the initial state.

8 pages, 2 figures

References in corpus (2)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• Light-Ion-Induced Multifragmentation: The ISiS Project

Cited by in corpus (19)

• Lambda Polarization in Peripheral Heavy Ion Collisions
• Global $\Lambda$ Polarization in high energy collisions
• Flow Vorticity in Peripheral High Energy Heavy Ion Collisions
• Directed flow, a signal for the phase transition in Relativistic Nuclear Collisions?
• Longitudinal fluctuations of the fireball density in heavy-ion collisions
• $\Lambda$ polarization in peripheral collisions at moderate relativistic energies
• Azimuthal anisotropy in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Spectator induced electromagnetic effect on directed flow in heavy ion collisions
• Longitudinal fluctuations of the center of mass of the participants in heavy-ion collisions
• Differential HBT Applied to Relativistic Fluid Dynamics
• Multi-particle long-range rapidity correlations from fluctuation of the fireball longitudinal shape
• Collective Flow Global Collective Flow in Heavy Ion Reactions from the Beginnings to the Future
• Study of Rotating High Energy Systems with the Differential HBT Method
• Photon Signals from Quarkyonic Matter
• Effects of Longitudinal Asymmetry in Heavy-Ion Collisions
• Rapidity dependence of transverse-momentum multiplicity correlations
• An Initial State with Shear in Peripheral Heavy Ion Collisions
• Longitudinal asymmetry in heavy ion collisions at RHIC
• Generalized Effective String Rope Model for the initial stages of Ultra-Relativistic Heavy Ion Collisions