Summary
An alternative technique to deal with processes in which two isospin-carrying electromagnetic or weak currents appear is developed to predict the amplitude up to nontrivial structure terms by means of the divergence conditions. Applications are made to isovector Compton scattering and radiative muon capture by a free proton.
Riassunto
Si sviluppa una tecnica alternativa per trattare processi con due correnti deboli od elettromagnetiche, in modo da predire l’ampiezza fino a termini di struttura non banali, per mezzo delle condizioni di divergenza. Si considerano applicazioni alla diffuzione Compton isovettoriale e alla cattura μ radiativa da protone libero.
Реэюме
Раэвивается альтернативная техника для рассмотрения процессов, в которых появляются два иэоспина, несуших злектромагнитный или слабый токи, чтобы предскаэать амплитуду вплоть до нетривиальных структурных членов с помошью условий расходимости. Рассматриваются применения предложенной техники к иэовекторному комптоновскому рассеянию и радиационному эахвату мюона свободным протоном.
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References
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The authors of (2) use a different parametrization (see their eqs. (59)a andb). Our choice seems to be more appropriate to the extraction of π-pole terms out of eq. (31). (An analogous situation arises with eqs. (22) and (23) of ref. (2).) Concerning π-pole terms note also the choices of form factors in our eqs. (31) and (40).
S. Fubini, G. Furlan andC. Rossetti:Nuovo Cimento,40 A, 1171 (1965).
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Christillin, P., Servadio, S. About low-energy expansion of two-current amplitudes. Nuov Cim A 42, 165–188 (1977). https://doi.org/10.1007/BF02724581
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DOI: https://doi.org/10.1007/BF02724581