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In statistics as applied in particular in particle physics, when fluctuations of some observables are measured, it is convenient to transform the multiplicity distribution to the bunching parameters:
Additional recommended knowledge
where Pn is probability of observing n objects inside of some phase space regions. The bunching parameters measure deviations of the multiplicity distribution Pn from a Poisson distribution, since for this distribution
Uncorrelated particle production leads to the Poisson statistics, thus deviations of the bunching parameters from the Poisson values mean correlations between particles and dynamical fluctuations.
Normalised factorial moments have also similar properties. They are defined as
Authors: S.V.Chekanov and V.I.Kuvshinov; Ref: Acta Phys. Pol. B25 (1994) p.1189-1197
Ref: J. Phys G22 (1996), p.601-610
Authors: S.V.Chekanov, W.Kittel and V.I.Kuvshinov; Ref: Z. Phys. C74 (1997) p.517-529
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bunching_parameter". A list of authors is available in Wikipedia.|