Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Heavy Ion Collisions and QCD Phases V

HK 21.8: Talk

Tuesday, March 28, 2017, 16:00–16:15, F 3

Coherent hypernucleus production in antiproton-nucleus collisions and κ meson — •Alexei Larionov¹, Horst Lenske², and Marcus Bleicher^3,4 — ¹National 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 p_lab=1.5÷20 GeV/c. The amplitude of the underlying p p → ΛΛ 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.