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We present an overview of the latest theoretical studies on the antikaonproperties in the nuclear medium, in connection with the recent experimentalclaims of very deeply bound antikaon-nuclear states. We argue that propermany-body formulations using modern realistic antikaon-nucleon interactions arenot able to generate such systems. Instead, a simple two-nucleon antikaonabsorption mechanism where the remaining nucleus acts as spectator explains thepeak in the semi-inclusive proton momentum spectrum, observed on a 4He targetat KEK (but later not confirmed in an inclusive experiment) and on a 6Li targetat FINUDA. This signal is clearly seen in another FINUDA experiment measuringthe invariant mass of Lambda-proton pairs after two-nucleon kaon absorption. Weshow that another peak of this experiment, seen at lower invariant masses andinterpreted as a bound K-pp state, is simply generated by the same two-nucleonabsorption mechanism followed by final-state interactions of the producedparticles with the residual nucleus. Our conclusion is that all theexperimental claims for the formation of very deeply bound antikaonic nuclearsystems receive an alternative explanation in terms of conventional nuclearprocesses.

A theoretical view on bound antikaon-nuclear states