Kondo effect of (D)over-bar(s) and (D)over-bar(s)* mesons in nuclear matter

摘要

We study the Kondo effect for (D) over bar (s) and (D) over bar (s)* mesons as impurity particles in nuclear matter. The spin- exchange interaction between the (D) over bar (s) or (D) over bar (s)* meson and the nucleon induces the enhancement of the effective coupling in the low-energy scattering in the infrared region, whose energy scale of singularity is given by the Kondo scale. We investigate the Kondo scale in the renormalization group equation at nucleon one-loop level. We furthermore study the ground state with the Kondo effect in the mean-field approach, and present that the Kondo scale is related to the mixing strength between the (D) over bar (s) or (D) over bar (s)* meson and the nucleon in nuclear matter. We show the spectral function of the impurity when the Kondo effect occurs.