Forward-backward rapidity correlations in relativistic heavy ion collisions : torqued fireball

TL;DR

This paper investigates the rapidity-dependent reaction plane fluctuations in relativistic heavy ion collisions, modeling a torqued fireball and proposing experimental measures for detection.

Contribution

It introduces a detailed hydrodynamical model of a torqued fireball with statistical fluctuations, linking initial state asymmetries to observable rapidity correlations.

Findings

Estimated the size of the torque effect in gold-gold collisions at RHIC energies.

Simulated the hydrodynamical evolution of the torqued fireball in 3+1 dimensions.

Proposed experimental measures to detect the torque effect.

Abstract

Statistical fluctuations in the transverse distribution of sources in relativistic heavy ion collisions and an asymmetric emission profile associated with the wounded nucleons lead to rapidity dependence of the reaction plane. The size of this effect is estimated for the gold-gold collisions at the highest RHIC energy ($\sqrt{s_{NN}}=200 \mathrm{GeV}$) in the Glauber model using GLISSANDO. The hydrodynamical evolution of the resulting torqued fireball is carried out in 3+1 dimensions considering a perfect fluid. Hadronization is simulated using THERMINATOR including non-flow contribution coming from resonance decays. Some experimental measures that can be used to detect the torque effect are proposed.