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The strength of charged particle forward-backward multiplicity correlation inpbar+p and p+p collisions at s^1/2 = 200 GeV is studied by PYTHIA 6.4 andcompared to the UA5 and STAR data correspondingly. It is turned out that afactor of 3-4 apparent discrepancy between UA5 and STAR data can be attributedto the differences in detector acceptances and observing bin interval in bothexperiments. A mixed event method is introduced and used to calculate thestatistical correlation strength and the dynamical correlation strengthsstemming from the charge conservation, four- momentum conservation, and decay,respectively. It seems that the statistical correlation is much larger thandynamical one and the charge conservation, four-momentum conservation and decaymay account for most part of the dynamical correlation. In addition, we havealso calculated the correlation strength by fitting the charged particlemultiplicity distribution from PYTHIA to the Negative Binomial Distribution andfound that the result agrees well with the correlation strength calculated bymixed events.

Theoretical analysis for the apparent discrepancy between pbarp and pp data in charged particle forward-backward multiplicity correlations