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Form factors in the radiative pion decay

AutorMathieu, Vincent; Portolés, Jorge
Palabras claveQCD
Chiral Lagrangians
Radiative pion decay
Fecha de publicación2007
EditorSpringer
CitaciónEur. Phys. J. C52 (2007) 325-338
ResumenWe perform an analysis of the form factors that rule the structure-dependent amplitude in radiative pion decay. The resonance contributions to pion -> e nu_e gamma decays are computed through the proper construction of the vector and axial-vector form factors by setting the QCD driven asymptotic properties of the three-point Green functions VVP and VAP, and by demanding the smoothening of the form factors at high transfer of momentum. A comparison between theoretical and experimental determination of the form factors is also carried out. We also consider and evaluate the role played by a non-standard tensor form factor. We conclude that, at present and due to the hadronic uncertainties, the search for new physics in this process is not feasible.
URIhttp://hdl.handle.net/10261/2736
DOI10.1140/epjc/s10052-007-0393-5
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