Bunching parameters and correlators in 400 GeV/c pp collisions

The multiplicity fluctuations of charged particles produced in pp collisions at 400 Gev/c have been studied by means of the bunching parameters (BPs) and bunching correlators. The results show that the values of BPs η2(M) and η3(M) depend not only on the width of multiplicity distribution, but also on the phase space correlations. The BPs η2(M) and η3(M) follow the same power-law behavior indicating multifractal structure in pp collisions at 400 GeV/c. The values of the second-order bunching correlators depend on the width of multiplicity distributions and decrease with increasing bin-bin distance D.