Large transverse momenta from statistical bootstrap with spin

Abstract

We show that statistical bootstrap models (SBM) with their prediction of exponentially decreasing p distributions (equivalently: constant maximal temperature τ 0 ≈ m π ) are not ruled out by the large p ⊥ observed above ≈ 100 GeV lab energy in hadron collisions. Usual SBM sum over all spin angular momenta of the decaying fireball; if a particular spin is fixed, SBM leads to large p ⊥. We discuss in this paper (after having justified a classical approach) several mechanisms yielding high-mass, high-spin fireballs, select arbitrarily one of these (single fireball excitation) and calculate in SBM with fixed spin the decay structure. The cross section dσ dM is taken to be an empirical function, fitted to existing p ⊥ data at one energy and then calculable at other energies. We can easily reproduce the p ⊥ distribution. Further results concern multiplicities rising with p ⊥, anisotropy of the single-particle inclusive distribution and various correlations. Unexpectedly, but a posteriori rather naturally a jet-like structure is found in the spin-orthogonal plane.