Longitudinal boost-invariance of charge balance function in hadron-hadron and nucleus-nucleus collisions

Abstract

Using Monte Carlo generators of the PYTHIA model for hadron-hadron collisions and a multi-phase transport (AMPT) model for nucleus-nucleus collisions, the longitudinal boost-invariance of charge balance function and its transverse momentum dependence are carefully studied. It shows that the charge balance function is boost-invariant in both {\it p}+{\it p} and Au+Au collisions in these two models, consistent with experimental data. The balance function properly scaled by the width of the pseudorapidity window is independent of the position or the size of the window and is corresponding to the balance function of the whole pseudorapidity range. This longitudinal property of balance function also holds for particles in small transverse momentum ranges in the PYTHIA and the AMPT default models, but is violated in the AMPT with string melting. The physical origin of the results are discussed.

5 pages, 4 figures

References in corpus (2)

• Transverse Velocity Dependence of the Proton-Antiproton Ratio as a Signature of the QCD Critical Endpoint
• Effect of equilibrium phase transition on multiphase transport in relativistic heavy ion collisions

Cited by in corpus (5)

• Longitudinal scaling property of the charge balance function in Au + Au collisions at 200 GeV
• Interpreting the charge-dependent flow and constraining the chiral magnetic wave with event shape engineering
• Charge-dependent transverse momentum and its impact on the search for the chiral magnetic wave
• Quark charge balance function and hadronization effects in relativistic heavy ion collisions
• Balance functions of charged hadron pairs $(\pi ,K,p)\otimes (\pi ,K,p)$ in Pb--Pb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$2.76 TeV