Abstract
The production of hypernuclei is investigated for p̅+A→Λ‾+ΛA reactions in a covariant meson exchange approach. Besides the conventional pseudo-scalar (K) and vector (K*) channels, we study for the first time also contributions from the correlated πK scalar channel, described by the k/K*0 meson. Initial and final state interactions are considered by eikonal theory. The total and angular differential cross sections of the coherent process p̅+AZ→ΛA(Z−1)+Λ̅ are evaluated at the beam momenta 1:5…20 GeV/c within the meson exchange model with bound proton and Λ-hyperon wave functions. It is shown that the shape of the beam momentum dependence of the hypernucleus production cross sections with various discrete Λ states is strongly sensitive to the presence of the scalar k meson exchange in the p̅p→Λ̅Λ amplitude. This can be used as a clean test of the exchange by scalar πK correlation in coherent p̅A reactions.
Highlights
Hypernuclei are being produced in manifold ways, by photon, pion, antikaon, proton, antiprotonand nucleus-nucleus interactions [1]
The production dynamics of the elementary and the in-medium annihilation amplitudes were described in a covariant meson exchange approach
Initial and final state interactions of the scattered baryons have been taken into account by eikonal theory
Summary
Hypernuclei are being produced in manifold ways, by photon-, pion-, antikaon-, proton-, antiprotonand nucleus-nucleus interactions [1] All these types of reactions, except the pA one, are rather well studied both experimentally and theoretically. Incoherent hypernucleus production in central collisions is initiated by antikaon production in elementary in-medium pN annihilation reactions followed by a sequence of strangeness exchange reactions of the type K N → Yπ Such reactions are the ideal tool to investigate simultaneously the production of single- and multi-strangeness systems, as discussed e.g. in our recent review article [6]. Any other independent source of information allowing to probe hyperon-nucleon and hyperon-nucleus interactions is highly wanted In this respect, hypernuclear reaction physics may provide important clues.
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