%AEeg, J O [Oslo Univ., Fysisk Inst. (Norway)]
%APicek, I [Univ. of Zagreb, Theoretical Physics Dep. (Yugoslavia)]
%D1992
%I; Oslo Univ. (Norway). Fysisk Inst.
%J
%K72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS, GOLDSTONE BOSONS, WEAK HADRONIC DECAY, KAONS, BAG MODEL, COUPLING, CP INVARIANCE, ENERGY-LEVEL TRANSITIONS, GAMMA DECAY, QUANTUM CHROMODYNAMICS, QUARK MODEL, QUARK-HADRON INTERACTIONS, TRANSITION AMPLITUDES, 662350, DECAYS OF MESONS
%PMedium: X; Size: [14] p.
%TOff-shell s{yields}d transitions i K-decays
%XThe authors consider contributions to decays of K-mesons from effective lagrangians involving (i{gamma}{center_dot}D-m{sub q}), where D{sub {mu}} is the covariant derivative and m{sub q} is a relevant quark mass. For this purpose an effective low-energy QCD is used, where the quarks are coupled to the pseudoscalar mesons {pi}, K, {eta}. These couplings are due to their Goldstone character and reflect chiral-symmetry breaking. Within this scheme it is shown explicitly that for the decays K{yields}{pi}{pi} and K{yields}{gamma}{gamma}, the physical effects of operators involving (i{gamma}{center_dot}D-m{sub q}) are not zero, contrary to current statements. To be more specific, one obtains a zero effect only in the limit when the quark-meson interactions are switched off, that is for f{sub {pi}}{yields}{infinity}. Numerically, one finds weak impact on the CP-conserving K{yields}{pi}{pi} amplitude, while the impact of K{yields}{gamma}{gamma} is substantial in the CP-violating case. 17 refs., 4 figs.
%0Technical Report
Norway Journal ID: ISSN 0332-5571; Other: ON: DE93613207; TRN: NO9200071008571 NWN English