Isolating dynamical net-charge fluctuations

Rudolph Rogly (1, 2) , Giuliano Giacalone (1) , Jean-Yves Ollitrault (1)

1 IPHT - Institut de Physique Théorique - UMR CNRS 3681
2 Mines Paris - PSL (École nationale supérieure des mines de Paris)

We modify the usual definitions of cumulants of net-charge fluctuations in a way that isolates dynamical fluctuations. The new observables, which we call dynamical cumulants, are robust with respect to trivial correlations induced by volume fluctuations and global charge conservation. We illustrate the potential of dynamical cumulants by carrying out Monte Carlo simulations where all correlations are trivial. The results of our simulations agree well with BNL Relativistic Heavy Ion Collider (RHIC) data, and are used to illustrate that dynamical cumulants consistently isolate dynamical fluctuations.

Mots clés: Relativistic Nuclear Collisions; charge: conservation law; numerical calculations: Monte Carlo; charge: fluctuation; impact parameter: fluctuation; charge correlation; Brookhaven RHIC Coll; heavy ion: scattering; quantum chromodynamics: matter; cumulant expansion; 19.6-62.4 GeV-cms/nucleon

Domaines: Physique Nucléaire Théorique [nucl-th]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique Nucléaire Expérimentale [nucl-ex]

Rudolph Rogly, Giuliano Giacalone, Jean-Yves Ollitrault. Isolating dynamical net-charge fluctuations. Phys.Rev.C, 2019, 99 (3), pp.034902. ⟨10.1103/PhysRevC.99.034902⟩. ⟨hal-01876138⟩