科研之友
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摘要
The Bethe-Salpeter equation is solved in the framework of the unitary coupled-channel approximation by using the pseudoscalar meson-baryon octet interaction. The loop function of the intermediate meson and baryon is deduced in a dimensional regularization scheme, where the relativistic kinetic effect and off-shell corrections are taken into account. Based on the experimental data at the K(-)p threshold, the subtraction constants in the loop function are determined. The squared amplitude is suppressed strongly and only one A(1405) state is generated dynamically in the strangeness S=-1 and isospin I-=0 sector.
