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

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

Differential production cross sections of K+/- 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 mic...

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Veröffentlicht in:Physical review letters 2006-02, Vol.96 (7), p.072301-072301, Article 072301
Hauptverfasser: Scheinast, W, Böttcher, I, Debowski, M, Dohrmann, F, Förster, A, Grosse, E, Koczoń, P, Kohlmeyer, B, Laue, F, Menzel, M, Naumann, L, Schwab, E, Senger, P, Shin, Y, Ströbele, H, Sturm, C, Surówka, G, Uhlig, F, Wagner, A, Waluś, W, Kämpfer, B, Barz, H W
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Sprache:eng
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Zusammenfassung:Differential production cross sections of K+/- 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 --> K- NN and an attractive in-medium K- N potential at saturation density.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.072301