Distillation of scalar exchange by coherent hypernucleus production in antiproton-nucleus collisions

Abstract

The total and angular differential cross sections of the coherent process $\bar{p}+{}^{A}Z\to {}_{\Lambda }^A(Z-1)+\bar{\Lambda }$ are evaluated at the beam momenta $1.5÷20$ GeV/c within the meson exchange model with bound proton and $\Lambda$-hyperon wave functions. It is shown that the shape of the beam momentum dependence of the hypernucleus production cross sections with various discrete $\Lambda$ states is strongly sensitive to the presence of the scalar $\kappa$-meson exchange in the $\bar{p}p\to \bar{\Lambda }\Lambda$ amplitude. This can be used as a clean test of the exchange by scalar $\pi K$ correlation in coherent $\bar{p}A$ reactions.

Comments: 12 pages, 6 figures, accepted in Phys. Lett. B. arXiv admin note: substantial text overlap with arXiv:1703.02073