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题名: Theoretical analysis for the apparent discrepancy between (p)over-barp and pp data in charged particle forward-backward multiplicity correlations
作者: Yan, Yu-Liang ;  Dong, Bao-Guo ;  Zhou, Dai-Mei ;  Li, Xiao-Mei ;  Sa, Ben-Hao
刊名: PHYSICS LETTERS B
出版日期: 2008
卷号: 660, 期号:5, 页码:478-482
关键词: BY-EVENT FLUCTUATIONS ;  PLUS PB COLLISIONS ;  TRANSVERSE-MOMENTUM ;  PBARP-COLLISIONS ;  DISTRIBUTIONS ;  ENERGIES ;  NUCLEON
学科分类: Physics
通讯作者: Sa, BH , China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China,Peoples R China
部门归属: [Yan, YL; Dong, BG; Li, XM; Sa, BH] China Inst Atom Energy, Beijing 102413, Peoples R China; [Dong, BG] Natl Lab Heavy Ion Collis, Ctr Theoret Phys, Lanzhou 730000, Peoples R China; [Zhou, DM; Sa, BH] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China; [Sa, BH] CCAST World Lab, Beijing 100080, Peoples R China; [Sa, BH] Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: The strength of charged particle forward-backward multiplicity correlation in (p) over bar + p and p + p collisions at root s = 200 GeV is studied by PYTHIA 6.4 and compared to the UA5 and STAR data correspondingly. It is turned out that a factor of 3-4 apparent discrepancy between UA5 and STAR data can be attributed to the differences in detector acceptances and observing bin interval in both experiments. A mixed event method is introduced and used to calculate the statistical correlation strength and the dynamical correlation strengths stemming from the charge conservation, four-momentum conservation, and decay, respectively. It seems that the statistical correlation is much larger than dynamical one and the charge conservation, four-momentum conservation and decay may account for most part of the dynamical correlation. In addition, we have also calculated the correlation strength by fitting the charged particle multiplicity distribution from PYTHIA to the Negative Binomial Distribution and found that the result agrees well with the correlation strength calculated by mixed events. (c) 2008 Elsevier B.V. All rights reserved.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000254034000007
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内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5561
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Yan, Yu-Liang,Dong, Bao-Guo,Zhou, Dai-Mei,et al. Theoretical analysis for the apparent discrepancy between (p)over-barp and pp data in charged particle forward-backward multiplicity correlations[J]. PHYSICS LETTERS B,2008,660(5):478-482.
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