The Ratio of Factorial Cumulant to Factorial Moment Versus the Size of Phase Space
Wang Shaoshun;Zhang Jie;Ye Yunxiu;Xiao Chenguo(Department of Modern Physics,University of Science and Technology of China,Hefei 230027)
The ratio of factorial cumulant to factorial moment of multiplicity distributions in different pseudorapidity windows has been calculated by using the experimental data of multiplicity production for pp collisions at 400GeV/c.The results show that the ratio Hq exhibits an initial abrupt descent and then an oscillation around zero when the order q is increased.It is coincident with the PQCD prediction.The difference is that the position of the first minimum moves to higher rank when the pseudorapidity window becomes smaller.
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