Medium modifications of kaons in pion matter

Details Medium modifications of kaons in pion matter Medium modifications of kaons in pion matter

2002-12-16

arxiv.org/abs/nucl-th/0212064v3

Phys.Rev.Lett. 93 (2004) 052301

Physics

Nuclear Physics

Nuclear Theory

5 pages, 2 figures, revised version accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.93.052301

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 $\pi K$ scattering phase shifts. The kaon in-medium broadening results in an acceleration of the $\phi \to K\bar{K}$ decay. The increased apparent dilepton branching of the $\phi $-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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