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Medium modifications of kaons in pion matter

B. V. Martemyanov·Amand Faessler·C. Fuchs·M. I. Krivoruchenko
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Abstract

Kaon in-medium masses and mean-field potentials are calculated in isotopically symmetric pion matter to one loop of chiral perturbation theory. The results are extended to RHIC temperatures using experimental data on $πK$ scattering phase shifts. The kaon in-medium broadening results in an acceleration of the $ϕ\to K\bar{K}$ decay. The increased apparent dilepton branching of the $ϕ$-mesons, observed recently by NA50, NA49, and the PHENIX collaborations at RHIC, is interpreted in terms of rescattering of secondary kaons inside of the pion matter.

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B. V. Martemyanov, Amand Faessler, C. Fuchs, M. I. Krivoruchenko. 2004-06-08. Medium modifications of kaons in pion matter. https://doi.org/10.1103/physrevlett.93.052301

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