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Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Heavy Ion Collisions and QCD Phases V

HK 21.8: Vortrag

Dienstag, 28. März 2017, 16:00–16:15, F 3

Coherent hypernucleus production in antiproton-nucleus collisions and κ meson — •Alexei Larionov1, Horst Lenske2, and Marcus Bleicher3,41National Research Center "Kurchatov Institute", 123182 Moscow, Russia — 2Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany — 3Frankfurt Institute for Advanced Studies (FIAS), D-60438 Frankfurt am Main, Germany — 4Institut für Theoretische Physik, J.W. Goethe-Universität, D-60438 Frankfurt am Main, Germany

Coherent reactions, when the hypernucleus is produced in a given quantum state, are especially sensitive to the reaction mechanism and to the properties of the Λ-nucleus interaction. In this talk we discuss the exclusive reaction A(p,Λ)ΛA at plab=1.5÷20 GeV/c. The amplitude of the underlying p pΛΛ process with bound proton and Λ includes t-channel exchanges by the pseudoscalar K, vector K*, and the yet to be confirmed scalar κ (i.e. K0*(800)) S=±1 mesons. The relativistic wave functions of the bound proton and Λ are calculated from the static Dirac equation with scalar and vector potentials fitted to describe the binding energy and r.m.s. nucleon radii of the initial nucleus and the phenomenological energy levels of the final hypernucleus. The initial and final state interactions of the antibaryons in the nucleus are described in the eikonal approximation. We show that inclusion of the κ meson strongly influences the beam momentum dependence of the hypernucleus production cross sections in various quantum states. This can be regarded as the first clear signal of the correlated π K 0+ exchange in p A collisions.

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