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Título : Form factors in the radiative pion decay
Autor : Mathieu, Vincent; Portolés, Jorge
Palabras clave : QCD
Chiral Lagrangians
Radiative pion decay
Fecha de publicación : 2007
Editor: Springer
Citación : Eur. Phys. J. C52 (2007) 325-338
Resumen: We 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.
URI : http://hdl.handle.net/10261/2736
DOI: 10.1140/epjc/s10052-007-0393-5
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