In Carrasco et al. we have recently proposed a method to calculate O(e^2) electromagnetic corrections to leptonic decay widths of pseudoscalar mesons. The method is based on the observation that the infrared divergent contributions (that appear at intermediate stages of the calculation and that cancel in physical quantities thanks to the Bloch-Nordsieck mechanism) are universal, i.e. depend on the charge and the mass of the meson but not on its internal structure. In this talk we perform a detailed analysis of the finite-volume effects associated with our method. In particular we show that also the leading 1/L finite-volume effects are universal and perform an analytical calculation of the finite-volume leptonic decay rate for a point-like meson.

Tantalo, N., Lubicz, V., Martinelli, G., Sachrajda, C.T., Sanfilippo, F., Simula, S. (2016). Electromagnetic corrections to leptonic decay rates of charged pseudoscalar mesons: finite-volume effects. In Proceedings of the 34th International Symposium on Lattice Field Theory (Lattice 2016) (pp.300).

Electromagnetic corrections to leptonic decay rates of charged pseudoscalar mesons: finite-volume effects

LUBICZ, Vittorio;Martinelli, Guido;SANFILIPPO, FRANCESCO;SIMULA, Silvano
2016-01-01

Abstract

In Carrasco et al. we have recently proposed a method to calculate O(e^2) electromagnetic corrections to leptonic decay widths of pseudoscalar mesons. The method is based on the observation that the infrared divergent contributions (that appear at intermediate stages of the calculation and that cancel in physical quantities thanks to the Bloch-Nordsieck mechanism) are universal, i.e. depend on the charge and the mass of the meson but not on its internal structure. In this talk we perform a detailed analysis of the finite-volume effects associated with our method. In particular we show that also the leading 1/L finite-volume effects are universal and perform an analytical calculation of the finite-volume leptonic decay rate for a point-like meson.
2016
Tantalo, N., Lubicz, V., Martinelli, G., Sachrajda, C.T., Sanfilippo, F., Simula, S. (2016). Electromagnetic corrections to leptonic decay rates of charged pseudoscalar mesons: finite-volume effects. In Proceedings of the 34th International Symposium on Lattice Field Theory (Lattice 2016) (pp.300).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/315960
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