标题： 固定味的夸克喷注中的负二项分布 显示英文标题

标题： The negative binomial distribution in quark jets with fixed flavour

摘要： 我们表明，在Z^0峰处e+e-湮灭中的双喷注事例的多重性分布以及因子累积量与因子矩的比值可以通过两个负二项分布的加权叠加很好地再现，分别对应于$b\bar b$和轻味事例的贡献。然后建议用负二项分布来描述固定味的双喷注事例的多重性分布。 显示英文摘要

摘要： 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.