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Multiplicity distribution of colour dipoles at small~x

G. P. Salam

hep-pharXiv:hep-ph/9504284

Abstract

The colour dipole multiplicity distribution is analysed for the wave function of a heavy onium state at small x. Numerical results for the average multiplicity and the effect of cutoffs on its power growth are presented. Then, the full multiplicity distribution is analysed: the second multiplicity moment is derived and the tail of the distribution is shown to behave as (-2 n). These results are confirmed by a Monte Carlo simulation which also gives the fluctuations in the spatial density of dipoles.

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