Pion radiative weak decays in nonlocal chiral quark models
We analyze the radiative pion decay π⁺ → e⁺ νeγ within nonlocal chiral quark models that include wave function renormalization. In this framework we calculate the vector and axial-vector form factors F V and F A at q² = 0 — where q² is the e⁺ ν e squared invariant mass — and the slope a of F V (q²)...
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| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2011
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/129305 |
| Aporte de: |
| Sumario: | We analyze the radiative pion decay π⁺ → e⁺ νeγ within nonlocal chiral quark models that include wave function renormalization. In this framework we calculate the vector and axial-vector form factors F V and F A at q² = 0 — where q² is the e⁺ ν e squared invariant mass — and the slope a of F V (q²) at q² → 0 . The calculations are carried out considering different nonlocal form factors, in particular those taken from lattice QCD evaluations, showing a reasonable agreement with the corresponding experimental data. The comparison of our results with those obtained in the (local) NJL model and the relation of F V and a with the form factor in π⁰ → γ ⁎ γ decays are discussed. |
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