THE HEAVY-QUARK FRAGMENTATION FUNCTION AND THE MULTIPLICITY DIFFERENCE BETWEEN HEAVY AND LIGHT-QUARK HADRONIC EVENTS IN E(-) ANNIHILATION IN THE LONGITUDINAL PHASE-SPACE MODEL()E()

The heavy quark fragmentation function and the multiplicity difference between heavy and light quark hadronic events are explained in a unif ied framework, namely the longitudinal phase space model. Good agreeme nt of the predictions with data has been achieved.