Scaling versus fireball behaviour in dual resonance decay

Abstract

The dual resonance model is used to calculate inclusive single particle distributions for the decay of a heavy cluster with fixed spin. In the statistical average, with equal weights and random phases for all degenerate states, the resulting spectrum provides, for a wide range of cluster masses and spins, a linearly exponential cut-off: the same behaviour as found in the statistical bootstrap model. On the other hand, specific (high mode) degenerate states are shown to yield a scaling decay spectrum, as conjectured e.g. by parton considerations for time-like photons. Consequences for hadron-hadron interactions and for e +e − annihilation are discussed.