First observation of in-medium effects on phase space distributions of antikaons measured in proton-nucleus collisions

W. Scheinast, I. Boettcher, M. Debowski +19

Differential production cross sections of $K^{\pm }$ mesons have been measured in $p$ + C and $p$ + Au collisions at 1.6, 2.5 and 3.5 GeV proton beam energy. At beam energies close…