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We study the (K-,p) reaction on nuclei with a 1 GeV/c momentum kaon beam,paying a special attention at the region of emitted protons having kineticenergy above 600 MeV, which was used to claim a deeply attractive kaon nucleusoptical potential. Our model describes the nuclear reaction in the framework ofa local density approach and the calculations are performed following twodifferent procedures: one is based on a many-body method using the Lindhardfunction and the other one is based on a Monte Carlo simulation. While bothprocedures coincide when it comes to consider the contribution of kaonquasi-elastic scattering, the simulation method offers more flexibility sinceit allows us to account for other processes which also contribute to the protonspectra, such as K- absorption by one and two nucleons producing hyperons. Thesimulation also considers final state interactions in terms of multiplescattering of the K-, p and all other primary and secondary particles on theirway out of the nucleus, as well as the weak decay of the produced hyperons into(pi N). We find that this kaon in-flight reaction is not well suited todetermine the kaon optical potential due, essentially, to the limitedsensitivity of the cross section to its strength, but also to unavoidableuncertainties in the contribution from other processes. We also simulate theexperimental requirement of having, together with the energetic proton, atleast one charged particle detected in the decay counter surrounding thetarget, and find that the shape of the original cross section is appreciablydistorted. We conclude that the new mechanisms, not considered in the analysisof the original experiment, allow us to explain the observed spectrum with theshallow kaon nucleus optical potential obtained in chiral models.

Proton emission off nuclei induced by kaons in flight