Deviation of the multiplicity distribution $P_q$ in a small bin from its Poisson counterpart $p_q$ is studied within the Ginzburg-Landau description for a second-order quark-hadron phase transition. The dynamical factor $d_q\equiv P_q{/p}_q$ for the distribution and the ratio $D_q\equiv d_q{/d}_1$ are defined, and novel scaling behaviors between $D_q$ are found which can be used to detect the formation of quark-gluon plasma. The study of $d_q$ and $D_q$ is also very interesting for other multiparticle production processes without a phase transition.

• Received 6 January 1998

DOI:https://doi.org/10.1103/PhysRevC.58.1183