A Jet Model Study of Correlations in Hadron-Hadron Reactions Due to Resonance Production

Abstract

Secondary particle correlations are discussed as a basic feature of hadron induced multiparticle reactions in the 5 to 1500 GeV energy range. Two introductory sections are devoted to definitions of cross sections and to empirical regularities of multiple production. Many of these regularities can be understood to be consequences of energy-momentum conservation and limited transverse momenta (uncorrelated jet model (UJM)). An extension of the UJM is considered, the correlated jet model (CJM), by introducing dynamical short range correlations between the particles which are assumed to be due to resonance production. Many properties of single-particle distributions and correlation functions can be derived already from kinematics of resonance decay. The CJM is used to investigate in detail the origin of angular correlations (azimuthal, GGLP-effect) and of correlations between neutral and charged particles (〈π°〉nc, f00(nc)). These correlations are shown to arise almost completely from the production and decay of mainly two-particle resonances like ∂°, K* and Δ, the main evidence coming from the use of the invariant mass as the basic variable where only resonances or reflections of them give remarkable effects. Compared to the UJM, the CJM is the first approximation of a successive correlations analysis of the production amplitude squared, i.e. having separated the effects of energy-momentum and quantum number conservation. This might be also interesting in view of the forthcoming accelerator generation.