A phenomenological investigation of the shower particle pseudorapidity fluctuations in hadron-nucleus collisions |
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Authors: | Gert Nilsson Bo Andersson Ingvar Otterlund |
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Institution: | Department of Theoretical Physics, University of Lund, Lund, Sweden;Department of Cosmic and Subatomic Physics, University of Lund, Lund, Sweden |
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Abstract: | From the experimental matrix (the number of events with a given number Ng of particles with velocity 0.3c<v<0.7c, and ns, the number of shower particles (v > 0.7c) in a pseudo-rapidity interval Δηi) obtained from the Heidelberg-Igel hadron-nucleus experiment at CERN, we extract the shower particle multiplicity distributions as a function of ν, the number of nucleons that interacted with the projectile. We use a theoretically justified statistical correlation between ν and Ng (recoil protons) and the assumption that the correlation between ns and Ng is given merely through ν. 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 Poissonian character in each η bin and for each value of ν. 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. |
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