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Theoretical analysis for the apparent discrepancy between (p)over-barp and pp data in charged particle forward-backward multiplicity correlations
Yan, Yu-Liang; Dong, Bao-Guo; Zhou, Dai-Mei; Li, Xiao-Mei; Sa, Ben-Hao; Sa, BH , China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China,Peoples R China
2008
发表期刊PHYSICS LETTERS B
ISSN0370-2693
卷号660期号:5页码:478-482
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.
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
关键词By-event Fluctuations Plus Pb Collisions Transverse-momentum Pbarp-collisions Distributions Energies Nucleon
学科领域Physics
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收录类别SCI
WOS记录号WOS:000254034000007
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5561
专题理论物理所1978-2010年知识产出
通讯作者Sa, BH , China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China,Peoples R China
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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.
APA Yan, Yu-Liang,Dong, Bao-Guo,Zhou, Dai-Mei,Li, Xiao-Mei,Sa, Ben-Hao,&Sa, BH , China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China,Peoples R China.(2008).Theoretical analysis for the apparent discrepancy between (p)over-barp and pp data in charged particle forward-backward multiplicity correlations.PHYSICS LETTERS B,660(5),478-482.
MLA Yan, Yu-Liang,et al."Theoretical analysis for the apparent discrepancy between (p)over-barp and pp data in charged particle forward-backward multiplicity correlations".PHYSICS LETTERS B 660.5(2008):478-482.
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