INTERMITTENCY IN E+E- ANNIHILATION AT PEP PETRA ENERGIES

Data on multiplicity moments in small rapidity windows can be reproduced in the string fragmentation model if the properties of directly produced pions are taken properly into account. The direct pions resolve the underlying parton structure better than the more massive resonances. From the tunneling production mechanism these pions are supposed to have smaller p⊥ than other particles, a property which has been neglected in the MC programs. This can also explain the high K/π ratio observed at large p⊥ in pp collisions. We also find that the result is sensitive to the cut-off for the perturbative QCD cascade. If αs is allowed to grow like 1 1n(k⊥2/Λ2) a small value for the cut-off implies that the perturbative treatment is not appropriate. In this case the state becomes too chaotic. © 1990.