scholarly journals Boost invariance and multiplicity dependence of the charge balance function in π+p and K+p collisions at s=22 GeV

2006 ◽  
Vol 637 (1-2) ◽  
pp. 39-42 ◽  
Author(s):  
M.R. Atayan ◽  
Yuting Bai ◽  
E.A. De Wolf ◽  
A.M.F. Endler ◽  
Jinghua Fu ◽  
...  
Keyword(s):  
Balance Function ◽  
Charge Balance ◽  
Boost Invariance

ON THE RELATION BETWEEN THE WIDTH OF CHARGE BALANCE FUNCTION AND HADRONIZATION TIME IN RELATIVISTIC HEAVY ION COLLISION

2007 ◽  
Vol 16 (10) ◽  
pp. 3355-3362
Author(s):  
DU JIAXIN ◽  
LI NA ◽  
LIU LIANSHOU
Keyword(s):  
Monte Carlo ◽  
Strong Dependence ◽  
Monte Carlo Study ◽  
Heavy Ion ◽  
High Energy ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Ion Collision ◽  
Balance Function ◽  
Charge Balance ◽  
Ion Collision

A Monte Carlo study on the charge balance function in high energy hadron-hadron and relativistic heavy ion collisions are carried out using the Monte Carlo generators PYTHIA and AMPT, respectively. A strong dependence of the width of balance function on multiplicity is found in both cases. Using the mean parton-freeze-out time of a heavy-ion-collision event as the characteristic hadronization time for the event, it is found that for a fixed multiplicity interval the width of balance function is consistent with being independent of hadronization time.

RAPIDITY DEPENDENCE OF CHARGE FLUCTUATIONS AND CORRELATIONS IN HADRONIC AND NUCLEAR COLLISIONS

2007 ◽  
Vol 22 (16n17) ◽  
pp. 2909-2919 ◽  
Author(s):  
AOQI FENG ◽  
NA LI ◽  
JINGHUA FU ◽  
YUANFANG WU
Keyword(s):  
Experimental Data ◽  
Balance Function ◽  
Charge Balance ◽  
Charge Fluctuations ◽  
Nuclear Collisions ◽  
Good Account ◽  
Central Rapidity ◽  
Charge Correlations ◽  
Rapidity Dependence ◽  
Longitudinal Phase

Size and position of rapidity window dependence of charge fluctuations and correlations are studied by PYTHIA and RQMD models for hadron–hadron and nucleus–nucleus collisions respectively. The results show that all the measures for charge fluctuations and correlations depend on the size of central rapidity windows and most of them depend on the position of the rapidity windows, which is not expected. Only charge balance function in hadron–hadron collisions is independent of the position of rapidity window, i.e. boost-invariant, in consistent with corresponding experimental data, while charge fluctuations measured by D(Q) is not boost-invariant in contrast to the experimental data. The measures for three kind of charge correlations (R++, R--, R+-) show a good account for the behavior of charge correlations and global charge conservation in longitudinal phase space in both PYTHIA and RQMD.

The study of longitudinal properties of the charge balance function

2011 ◽  
Vol 85 (6) ◽  
pp. 923-927 ◽  
Author(s):  
Na Li ◽  
Zhiming Li ◽  
Lianshou Liu ◽  
Yuanfang Wu
Keyword(s):  
Balance Function ◽  
Charge Balance

Resonance-like QGP signals displayed in general charge balance functions

2014 ◽  
Vol 23 (08) ◽  
pp. 1450036 ◽  
Author(s):  
Ying-Hua Pan ◽  
Wei-Ning Zhang
Keyword(s):  
Bound States ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Balance Function ◽  
Lattice Simulation ◽  
Charge Balance ◽  
Ion Collisions ◽  
Quark Production ◽  
Balance Functions

Experiment and lattice simulation show that the quark–gluon plasma (QGP) system displays strong interaction between constituents at temperature a few times the critical temperature Tc. This QGP picture can be explained by assuming that the QGP matter above Tc is rich in different kinds of bound states, namely resonance-like QGP (RQGP). The chemical composition of the QGP system produced in ultra-relativistic heavy-ion collisions can be investigated through a general charge balance function which describes two-wave quark production during expansion afterward. In this paper, we investigate the signals of this RQGP through general charge balance functions. We find that the quasiparticles in QGP contribute a little to the balance functions because of their heavy masses. The balance functions reduce to the situation discussed before where only one-wave charge production is involved if only the quasiparticles in QGP are considered. However, the baryonic bound states in QGP have a significant effect on the balance function [Formula: see text], causing a dip in the [Formula: see text] balance function at small Δy. The existence of the binary and baryonic bound states amplify the negative dip of the balance function BpK-(Δy) at Δy ∽ 1.

PSEUDORAPIDITY AND TRANSVERSE MOMENTUM DEPENDENCE OF CHARGE BALANCE IN Au−Au COLLISIONS AT $\sqrt{s_{NN}} = 200\, {\rm GeV}$

2007 ◽  
Vol 16 (10) ◽  
pp. 3347-3354 ◽  
Author(s):  
◽  
LI ZHIMING ◽  
LI NA ◽  
LIU LIANSHOU ◽  
WU YUANFANG
Keyword(s):  
Transverse Momentum ◽  
Time Projection Chamber ◽  
Momentum Dependence ◽  
Balance Function ◽  
Charge Balance ◽  
Thermal Models ◽  
Transverse Momentum Dependence ◽  
Time Projection ◽  
Star Detector

The charge balance function (BF) is studied in Au − Au collisions at [Formula: see text] using the STAR detector. It is observed that within the acceptance (−1.3 < η < 1.3) of STAR Time Projection Chamber (TPC), the BF is independent of the position of the windows of same size, showing that BF is boost-invariant in the TPC accepted region. It is found that the BF measured in an observed window η w , B(δη|η w ), divided by [Formula: see text] is independent of the size and position of the observed window η w . These properties of BF hold for different transverse momenta and the width of BF decreases with the increasing of the latter. The result supports the delayed-hadronization scenario in thermal models.

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