Composite Particle Model Approach to the Nonleptonic Hyperon Decays
نویسندگان
چکیده
منابع مشابه
Role of resonances in nonleptonic hyperon decays
We examine the importance of resonances for the non–leptonic hyperon decays in the framework of chiral perturbation theory. Lower lying resonances are included into the effective theory. Integrating out the heavy degrees of freedom in the resonance saturation scheme generates higher order counterterms in the effective Lagrangian, providing an estimate of the pertinent coupling constants. A fit ...
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Despite measurements which date more than 20 years ago, no straightforward solution of the ratio of the parity-conserving (P-wave) to parityviolating (S-wave) decays of the hyperons has been obtained. Here we use two 2-point methods in QCD sum rules to examine the problem. We obtain quite different results for the two methods. Neither one gives results that agree with the data. We discuss possi...
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The sum of the CP -violating asymmetries A(Λ−) and A(Ξ − −) in hyperon nonleptonic decays is presently being measured by the E871 experiment. We evaluate contributions to the asymmetries induced by chromomagnetic-penguin operators, whose coefficients can be enhanced in certain models of new physics. Incorporating recent information on the strong phases in Ξ → Λπ decay, we show that new-physics ...
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We recalculate the leading nonanalytic contributions to the amplitudes for hyperon nonleptonic decays in chiral perturbation theory. Our results partially disagree with those calculated before, and include new terms previously omitted in the P-wave amplitudes. Although these modifications are numerically significant, they do not change the well-known fact that good agreement with experiment can...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1967
ISSN: 0033-068X
DOI: 10.1143/ptp.37.1245