Influence of a Z+(1540) resonance on K+N scattering
J. Haidenbauer, G. Krein
Abstract
The impact of a (I=0, JP=1/2+) Z+(1540) resonance with a width of 5 MeV or more on the K+N (I=0) elastic cross section and on the P01 phase shift is examined within the KN meson-exchange model of the Juelich group. It is shown that the rather strong enhancement of the cross section caused by the presence of a Z+ with the above properties is not compatible with the existing empirical information on KN scattering. Only a much narrower Z+ state could be reconciled with the existing data -- or, alternatively, the Z+ state must lie at an energy much closer to the KN threshold.
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