Two-loop effective theory analysis of pi (K)-->enu[over ]_{e}[gamma] branching ratios |
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| Authors: | Cirigliano Vincenzo Rosell Ignasi |
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| Institution: | Theoretical Division, Los Alamos National Laboratory, Los Alamos New Mexico 87544, USA. |
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| Abstract: | We study the ratios R_{e/mu};{(P)} identical withGamma(P-->enuover ]_{e}gamma])/Gamma(P-->munuover ]_{mu}gamma]) (P=pi, K) in Chiral Perturbation Theory to order e;{2}p;{4}. We complement the two-loop effective theory results with a matching calculation of the counterterm, finding R_{e/mu};{(pi)}=(1.2352+/-0.0001)x10;{-4} and R_{e/mu};{(K)}=(2.477+/-0.001)x10;{-5}. |
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