Analysis of Multiplicity Fluctuations in pp Collisions at 400 GeV/c by Bunching Parameters

The multiplicity fluctuations of charged particles produced in pp collisions at 400 GeV/c have been studied by means of the bunching parameters(BPs).The results show that the values of BPsŋ2(M)andŋ3(M)depend not only on the width of multiplicity distribution,but also on the phase space correlations.The BPs:ŋ2(M)andŋ3(M)follow the same power-law behavior,which indicates that the multifractal structure in pp collisions at 400 GeV/c is observed.