THE NEGATIVE BINOMIAL DISTRIBUTION IN QUARK JETS WITH FIXED FLAVOUR
A. Giovannini, S. Lupia and R. Ugoccioni
We show that both the multiplicity distribution and the ratio of
factorial cumulants over factorial moments for 2-jet events in
$e^+e^-$ annihilation at the $Z^0$ peak can be well reproduced by the
weighted superposition of two negative binomial distributions,
associated to the contribution of $b\bar b$ and light flavoured events
respectively. The negative binomial distribution is then suggested to
describe the multiplicity distribution of 2-jet events with fixed
flavour.
LU TP 96-23, DFTT 50/96, MPI-PhT/96-80
(Submitted to Physics Letters B)