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

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.064910· OSTI ID:21296618

Na, Li; Zhiming, Li; Yuanfang, Wu ^[1]

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1. Key Laboratory of Quark and Lepton Physics, Ministry of Education Institute of Particle Physics, Huazhong Normal University, Wuhan 430079 (China)

Using Monte Carlo generators of the PYTHIA model for hadron-hadron collisions and a multiphase 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 p+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 is discussed.

• OSTI ID: 21296618
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
BALANCES
COLLISIONS
GOLD
HADRON-HADRON INTERACTIONS
HADRONS
MELTING
MONTE CARLO METHOD
NUCLEI
PARTICLE RAPIDITY
PROTON-PROTON INTERACTIONS
TRANSVERSE MOMENTUM