Kaon and antikaon properties in cold nuclear medium

Details Kaon and antikaon properties in cold nuclear medium Kaon and antikaon properties in cold nuclear medium

2004-04-29

arxiv.org/abs/nucl-th/0404088v2

Acta Phys.Hung.A22:21-28,2005

Physics

Nuclear Physics

Nuclear Theory

8 pages, 4 figures, submitted to Heavy Ion Physics

Scientific paper

10.1556/APH.22.2005.1-2.4

We present results of a self-consistent calculation for the kaon and antikaon spectral functions in cold nuclear matter, using as input the kaon-nucleon and antikaon-nucleon scattering amplitudes of the vacuum. We investigate the effect of in-medium pion dressing on the antikaon-nucleon scattering amplitudes and antikaon spectral function. We find the influence of pion dressing to be minor on the antikaon spectral function and limited on the hyperon resonances causing only a small additional broadening. An exception is the \Sigma(1690). At nuclear saturation density an attractive mass shift of about 20 MeV and width of about 130 MeV is obtained. The kaon shows a repulsive mass increase of 36 MeV and a small width of the quasiparticle peak at saturation density.

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