Phenomenological Investigation of the Shower Particle Pseudorapidi Ty Fluctuations in Hadron-Nucleus Collisions

摘要

From the experimental matrix f(N sub g;n sub s, delta n sub i) (the number of events with a given number N sub g of particles with velocity 0.3c0.7c) in a pseudorapidity interval deltan sub i) obtained from the Heidelberg-Igel hadron-nucleus experiment at CERN, we extract the shower particle multiplicity distributions as a function of v, the number of nucleons that interacted with the projectile. We use a theoretical justified statistical correlation between v and N sub g (recoil protons) and the assumption that the correlation between n sub s and N sub g is given merely through v. The data used are for incoming energies 50 and 150 GeV with a proton or pion as the projectile and Cu or Pb as the target. We find that the shower particle multiplicity distributions are of a Possonian character in each n - bin and for each value of v. The average multiplicities are approximately the same for the two targets and for the different projectile, possibly with a small excess for the pion projectile. The results are compared to a rather general theoretical model of the soft interaction type. The predictions from this model for the shower particle pseudorapidity distributions are very close to the derived values. (Atomindex citation 12:606524)