Chiral perturbation theory for hyperon decays
نویسندگان
چکیده
منابع مشابه
Hyperon Decays in Chiral Perturbation Theory Revisited
The discrepancies found between S-wave and P-wave fits for hyperon decays are reinvestigated using the heavy baryon chiral Lagrangian formalism. The agreement is found to improve through the inclusion of previously omitted diagrams. The S-waves are unaffected by this, but the P-wave predictions are modified. A correlated fit to the chiral parameters is performed and the results discussed.
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We study the |∆I| = 3/2 amplitudes of hyperon non-leptonic decays of the form B → B′π in the context of chiral perturbation theory. The lowest-order predictions are determined in terms of only one unknown parameter and are consistent within errors with current data. We investigate the theoretical uncertainty of these predictions by calculating the leading nonanalytic corrections. We also presen...
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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...
متن کاملHyperon weak radiative decays in chiral perturbation theory.
We investigate the leading-order amplitudes for weak radiative decays of hyperons in chiral perturbation theory. We consistently include contributions from the next-to-leading order weak-interaction Lagrangian. It is shown that due to these terms Hara’s theorem is violated. The data for the decays of charged hyperons can be easily accounted for. However, at this order in the chiral expansion, t...
متن کاملNon-leptonic hyperon decays in chiral perturbation theory
The non-leptonic hyperon decays are analyzed up to one-loop order including all counterterms in the framework of heavy baryon chiral perturbation theory. We use the exchange of the spin2 decuplet resonances as an indication of which low-energy constants contribute significantly to these investigated processes . We choose four independent decay amplitudes that are not related by isospin relation...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1999
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(99)00128-1