Low-energy theorems for weak pion production
Abstract
We derive novel low-energy theorems for single pion production off nucleons through the isovector axial current. We find that the k2-dependence of the multipole L(+)0+ at threshold is given by the nucleon scalar form factor, namely σ( k2 - Mπ2)/(3 πMπFπ). The relation to PCAC results for soft pions including electroweak form factors is also clarified.
- Publication:
-
Physics Letters B
- Pub Date:
- June 1994
- DOI:
- arXiv:
- arXiv:hep-ph/9312307
- Bibcode:
- 1994PhLB..331..137B
- Keywords:
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- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 9 pp, TeX, 2 figures available as ps files, CRN 93-56