Angular Intermittency in QCD Jets

Abstract

Using two methods, via fluctuations and correlations, an analytical formula is derived for the factorial multiplicity moments in a QCD jet at the Double Leading Logarithm accuracy. The resulting self-similar dependence on the solid-angle cell size is characteristic of an intermittency behaviour in angular variables. The intermittency indices depend on the diffusion angle through the running of ${\alpha }_s.$ Physical features of jet fluctuations such as collimation at large angles and saturation at small angles are well described in the perturbative framework. A parameter-free prediction of angular intermittency is proposed for ${\mathcal{Z}}^0$ decays into hadrons, assuming hadron-parton duality.

Comments: Saclay-t93/011