ENERGY SCAN FOR NARROW STATES IN e+ e- ANNIHILATION AT center-of-mass ENERGIES BETWEEN 29.90-GeV AND 31.46-GeV

A fine energy scan has been performed to search for narrow states in e+e− annihilation at c.m. energies between 29.90 and 31.46 GeV. No such state has been observed. The 90% confidence upper limit on the leptonic decay width times the hadronic decay branching ratio is ΓeeBh<1.6 keV

RAPID GROWTH OF CHARGED PARTICLE MULTIPLICITY IN HIGH-ENERGY e+ e- ANNIHILATIONS

Hadron production by e+e− annihilation has been studied for c.m. energies W between 13 and 31.6 GeV. As a function of 1n W the charged particle multiplicity grows faster at high energy than at lower energies. This is correlated with a rise in the plateau of the rapidity distribution. The cross section sdσ/dx is found to scale within ±30% for x > 0.2 and 5 W 31.6 GeV