Off-shell s{yields}d transitions i K-decays
Eeg, J O [Oslo Univ., Fysisk Inst. (Norway)]; Picek, I [Univ. of Zagreb, Theoretical Physics Dep. (Yugoslavia)]
72 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
The 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.
Oslo Univ. (Norway). Fysisk Inst.
OSTI; NTIS; INIS
Norway
1992-07-01
English
Technical Report
Other Information: PBD: Jul 1992
Medium: X; Size: [14] p.
ON: DE93613207
OUP-92-13
Journal ID: ISSN 0332-5571; Other: ON: DE93613207; TRN: NO9200071008571
NWN; SCA: 662350; PA: AIX-24:008571; SN: 93000933094
2008-02-12
10119661