Radial flow of kaon mesons in heavy ion reactions
Z. S. Wang, Amand Faessler, C. Fuchs, V. S. Uma Maheswari, T. Waindzoch
Abstract
This work investigates the collective motion of kaons in heavy ion reactions at SIS energies (about 1-2 GeV/nucleon). A radial collective flow of K+ mesons is predicted to exist in central Au + Au collisions, which manifests in a characteristic "shoulder-arm" shape of the transverse mass spectrum of the midrapidity K+ mesons. The K+ radial flow arises from the repulsive K+ mean field in nuclear matter. In spite of a strong reabsorption and rescattering the attractive K- mean field leads as well to a collective radial flow of K- mesons. The K- radial flow, however, is different from that of K+ mesons and can be observed by a characteristic "concave" structure of the transverse mass spectrum of the K- mesons emitted at midrapidity. The kaon radial flows can therefore serve as a novel tool for the investigation of kaon properties in dense nuclear matter.
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