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

W. Scheinast; I. Boettcher; M. Debowski; F. Dohrmann; A. Foerster; E. Grosse; P. Koczon; B. Kohlmeyer; F. Laue; M. Menzel; L. Naumann; E. Schwab; P. Senger; Y. Shin; H. Stroebele; C. Sturm; G. Surowka; F. Uhlig; A. Wagner; W. Walus; B. Kampfer; H. W. Barz

doi:10.1103/physrevlett.96.072301

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

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Abstract

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 to the production threshold, the $K^-$ multiplicity is strongly enhanced with respect to proton-proton collisions. According to microscopic transport calculations, this enhancement is caused by two effects: the strangeness exchange reaction $NY \to K^- NN$ and an attractive in-medium $K^-N$ potential at saturation density.

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W. Scheinast, I. Boettcher, M. Debowski, F. Dohrmann, A. Foerster, E. Grosse, P. Koczon, B. Kohlmeyer, F. Laue, M. Menzel, L. Naumann, E. Schwab, P. Senger, Y. Shin, H. Stroebele, C. Sturm, G. Surowka, F. Uhlig, A. Wagner, W. Walus, B. Kampfer, H. W. Barz. 2006-01-04. First observation of in-medium effects on phase space distributions of antikaons measured in proton-nucleus collisions. https://doi.org/10.1103/physrevlett.96.072301

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