Bochum 1998 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 54: Structure of Baryons, Mesons VII, Theory
HK 54.2: Gruppenbericht
Mittwoch, 18. März 1998, 14:30–15:00, H
Modification of the φ-meson spectrum in nuclear matter — •Frank Klingl, Thomas Waas, and Wolfram Weise — Technische Universität München, Physik Department T39
The vacuum spectrum of the φ-meson is characterized by its decay into
KK . Modifications of the K K-loops in baryonic
matter change this spectrum. We calculate these in-medium modifications
taking both s- and p-wave kaon-nucleon interactions into account. We use
results of the in-medium K and K spectra determined
previously from a coupled channel approach based on a chiral effective
Lagrangian. Altogether we find a very small shift of the φ
meson mass, by less than 10 MeV at normal nuclear matter density ρ0. The
in-medium decay width of the φ meson increases such that its life time
at ρ=ρ0 is reduced to less than 5 fm/c. It should
therefore be possible to observe medium effects in reactions such as π− p
→ φ n in heavy nuclei, where the φ meson can be produced with
small momentum.
Work supported in part by GSI and BMBF