Mesonic and non-mesonic branching ratios of K^- absorption in the nuclear medium

Abstract

The branching ratios of K^- absorption at rest in nuclear matter are evaluated from the K^- self-energy by using the chiral unitary approach for the s-wave \bar{K} N amplitude. We find that both the mesonic and non-mesonic absorption potentials are dominated by the Λ(1405) contributions. We also observe that the mesonic absorption ratio [π^{-} Σ^{+}] / [π^{+} Σ^{-}] increases as a function of nuclear density due to the interference between Λ(1405) and the I=1 non-resonant background, which is consistent with experimental results. The fraction of the non-mesonic absorption is evaluated to be about 30 % at the saturation density. The branching ratios of the K^- absorption at rest into deuteron and 4He are also calculated.

4 pages, 3 figures, talk given at XI International Conference on Hypernuclear and Strange Particle Physics (HYP2012), Barcelona, Spain, 1-5 October 2012

References in corpus (6)

• In-medium nuclear interactions of low-energy hadrons
• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• $\Lambda d$ correlations from the ${}^4$He(stopped-$K^{-}$,$d$) reaction
• Recent studies of kaonic atoms and nuclear clusters
• Lambda(1405)-induced non-mesonic decay in kaonic nuclei
• Nuclear density probed by Kaon-Nucleus systems and Kaon-Nucleus interaction