期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2007年34(8):S1113-S1117 ISSN：0954-3899
通讯作者：
Wu, Yuanfang
作者机构：
[Huang, Yanping; Wu, Yuanfang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, Yuanfang] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
会议名称：
19th International Conference on Ultra-Relativistic Necleus-Nucleus Collisions
会议时间：
NOV 14-20, 2006
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Two-charge-particle azimuthal correlations (TCPAC) and the azimuthal charge balance function (ACBF) are compared with anisotropic flow by using transport models, RQMD and AMPT. In these two models, TCPAC has the same centrality dependence as anisotropic flow. The momentum conservation contributes only back-to-back correlations in TCPAC, which are well separated from small angle correlations caused by anisotropic transverse momentum distribution, while the centrality dependence of ACBF is different from those of anisotropic flow and TCPAC. This indicates that ACBF cannot be used as another presentation of anisotropic flow, as expected from thermal models.
摘要：
Boost invariance and multiplicity dependence of the charge balance function are studied in pi(+)p and K(+)p collisions at 250 GeV/c incident beam momentum with full acceptance coverage. Charge balance, as well as charge fluctuations, are found to be boost invariant over the whole rapidity region, but both depend on the size of the rapidity window. It is also found that the balance function becomes narrower with increasing multiplicity, which is consistent with the narrowing of the balance function with increasing centrality and/or system size, as observed in current relativistic heavy ion experiments. (c) 2006 Elsevier B.V. All rights reserved.
摘要：
Rapidity, azimuthal and multiplicity dependence of mean transverse momentum and transverse momentum correlations of charged particles is studied in π+p and K+p collisions at 250 GeV/c incident beam momentum. For the first time, it is found that the rapidity dependence of the two-particle transverse momentum correlation is different from that of the mean transverse momentum, but both have similar multiplicity dependence. In particular, the transverse momentum correlations are boost invariant. This is similar to the recently found boost invariance of the charge balance function. A strong azimuthal dependence of the transverse momentum correlations originates from the constraint of energy-momentum conservation. The results are compared with those from the PYTHIA Monte Carlo generator. The similarities to and differences with the results from current heavy ion experiments are discussed.
摘要：
Rapidity, azimuthal and multiplicity dependence of inclusive mean transverse momentum and transverse momentum correlation is studied in π+p and K+p collisions at 250 GeV/c. It is found for the first time that rapidity dependence of two‐particle transverse momentum correlations is different from those of inclusive mean transverse momentum but both have similar multiplicity dependence. In particular, the transverse momentum correlation is boost‐invariant. The strong azimuthal dependence of transverse momentum correlation comes from the constraint of energy‐momentum conservation. The results are compared with those from the PYTHIA Monte Carlo generator. The similarities and differences with those from current heavy ion experiments are discussed.
摘要：
Boost invariance and multiplicity dependence of the charge balance function are studied in π +p and K+p collisions at 22 GeV. Charge balance, as well as charge fluctuations, are found to be boost invariant over the whole rapidity region, but both depend on the size of the rapidity window. It is also found that the balance function becomes narrower with increasing multiplicity, consistent with the narrowing of the balance function when centrality and/or system size increase, as observed in current relativistic heavy ion experiments.
期刊：
ICHEP 2005: PROCEEDINGS OF THE 32ND INTERNATIONAL CONFERENCE HIGH ENERGY PHYSICS VOLS 1 AND 2,2005年:685-688
通讯作者：
Wu, YF
作者机构：
[Wu, YF] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.
通讯机构：
[Wu, YF] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.
摘要：
Event-by-event transverse-momentum and charge fluctuations in pi(+)p and K(+)p collisions at 250 GeV/c are reviewed. For the first time, the dependence of these fluctuations on the size of central rapidity and transverse momentum windows are systematically presented. The results are compared with those from heavy ion experiments and PYTHIA. The significant similarities and differences are pointed out.
摘要：
The entropy properties are analyzed by Ma's coincidence method in π+p and K+p collisions of the NA22 experiment at 250 GeV/c incident momentum. By using the Rényi entropies, we test the scaling law and additivity properties in rapidity space. The behavior of the Rényi entropies as a function of the average number of particles is investigated. The results are compared with those from the PYTHIA Monte Carlo event generator.
摘要：
We report on measurements of event-by-event charge fluctuations in π+p and K+p collisions at 250 GeV/c. The dependence of these fluctuations on the size of the rapidity windows are presented for the first time in the full phase-space domain. The corrections for the influence of global charge conservation and leading-particle stopping are tested by the data. The discrepancy due to incomplete correction given by STAR and PHENIX are estimated. The dependence of the fluctuations on the position of the rapidity bin and on the multiplicity at different rapidity windows are also presented.
通讯机构：
[Wu, YF] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.
摘要：
Two spatial correlation patterns, fixed-to-arbitrary and neighboring bin correlation patterns, are suggested. It is demonstrated that these patterns present scale-independent and distinguishable measures for correlated and uncorrelated random multiplicative cascade processes. Their application to very high multiplicity events in relativistic heavy ion collisions is discussed.
作者机构：
[Wu, YF; Li, ZM] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YF] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
It reports on charge fluctuations in π+p and K+p collisions at 250 GeV/c. The dependence of these fluctuations on the size of rapidity window and on the multiplicity are presented systematically. The results are compared with those obtained from current theoretical expectations for a hadronic gas, a QGP phase, a stochastic model and a PYTHIA simulation.
期刊：
INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2003年18(29):5337-5362 ISSN：0217-751X
通讯作者：
Wu, YF
作者机构：
[Wu, YF; Liu, LS] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YF] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
High energy collisions;fractal;self-affine;self-similar
摘要：
Different fractality in hadron–hadron and e+e- collisions and its experimental observation are reviewed. The discussions on related underlying dynamics are presented.
作者机构：
[Kittel, W] Univ Nijmegen, Inst High Energy Phys, NL-6525 ED Nijmegen, Netherlands.;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.;Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium.;Inst Phys, AM-375036 Yerevan, Armenia.;Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil.
通讯机构：
[Kittel, W] U;Univ Nijmegen, Inst High Energy Phys, NL-6525 ED Nijmegen, Netherlands.
摘要：
Two suggested moments of rapidity gaps are studied on π+p and K+p collisions at 250 GeV/c. The experimental results are compared with those obtained from Pythia simulation. The efficiency of the method is discussed.
