First lattice calculation of the QED corrections to leptonic decay rates

Abstract

The leading-order electromagnetic and strong isospin-breaking corrections to the ratio of $K_{\mu 2}$ and ${\pi }_{\mu 2}$ decay rates are evaluated for the first time on the lattice, following a method recently proposed. The lattice results are obtained using the gauge ensembles produced by the European Twisted Mass Collaboration with $N_f=2+1+1$ dynamical quarks. Systematics effects are evaluated and the impact of the quenched QED approximation is estimated. Our result for the correction to the tree-level $K_{\mu 2}/{\pi }_{\mu 2}$ decay ratio is $-1.22(16)\%$ to be compared to the estimate $-1.12(21)\%$ based on Chiral Perturbation Theory and adopted by the Particle Data Group.

5 pages, 6 figures; extended supplemental material with 1 table and 1 figure, results unchanged

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