Göttingen 1997 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 26: Hadronisch wechselwirkende Sonden I
HK 26.5: Vortrag
Dienstag, 25. März 1997, 15:45–16:15, HS H
Heavy Meson Production in Proton-Nucleus Reactions with Empirical Spectral Functions — •A. Sibirtsev, W. Cassing, and U. Mosel — Institut für Theoretische Physik, Universität Giessen
We study the production of K+, ρ, ω and φ mesons in p + 12C reactions on the basis of empirical spectral functions from [1,2], which provide the distribution of nucleons in the target as a function of their energy as well as their 3-momenta. The elementary cross sections for the meson production in nucleon-nucleon and pion-nucleon collisions are evaluated in an One-Boson-Exchange (OBE) model close to threshold energies and by the LUND string formation and fragmentation model for inclusive reactions at higher energies. We find that in p + 12C reactions the high momentum, high removal energy part of the spectral function is negligible in all cases close to the absolute threshold. Furthermore, the two-step process (pN → π NN; π N → N + K+, ρ, ω, φ) dominates the cross section at threshold energies in line with earlier calculations based on the folding model [3].
[1] I. Sick et al., Phys. Lett. B323, 267 (1994)
[2] C. Ciofi degli Atti et al., Phys. Rev. C53, 1689 (1996)
[3] W. Cassing et al., Z. Phys. A340, 51 (1991)
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