Off-shell effects in heavy particle production

Abstract

Off-shell propagation of nucleons is neglected in one-body transport models of heavy-ion collisions, but it could be significant in processes that are limited by phase space, such as the threshold production of heavy particles. We estimate the relative magnitude of off-shell production to on-shell production of the N${}^{\ast }$(1535) resonance in heavy ion collisions. In the region where the on-shell production is dominated by a~two-step mechanism with an intermediate $\Delta$, we find that the contribution of off-shell scattering between projectile and target nucleons is indeed small. Beyond the latter contribution, however, correlations in the initial wave function produce off-shell contributions which can exceed those of the on-shell $\Delta$ mechanism.

8 pages, 1 uuencoded Postscript figure

References in corpus (2)

• Analysis of Subthreshold Antiproton Production in p-Nucleus and Nucleus-Nucleus Collisions in the RBUU Approach
• Near-threshold $K^{+}$ Production in Heavy-ion Collisions

Cited by in corpus (12)

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• Medium effects in high energy heavy-ion collisions
• Transport Theoretical Approach to the Nucleon Spectral Function in Nuclear Matter
• Off-shell effects on particle production
• Constraining nucleon high momentum in nuclei
• Nuclear Matter Spectral Functions by Transport Theory
• K^+ production in baryon-baryon and heavy-ion collisions
• Mass dependence and isospin dependence of short-range correlated pairs
• Off-shell pions in Boltzmann-Uehling-Uhlenbeck transport theory
• Dynamical response functions in correlated fermionic systems
• Dressed vertices
• Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions