Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.072001
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Funding
- PRACE [Pra10-2693]
- MIUR (Italy) [PRIN 2015P5SBHT]
- ERC Ideas Advanced Grant [267985]
- STFC (UK) [ST/L000296/1, ST/P000711/1]
- CINECA [INFN-LQCD123]
- Science and Technology Facilities Council [ST/L000296/1, ST/P000711/1] Funding Source: researchfish
- STFC [ST/P000711/1, ST/L000296/1] Funding Source: UKRI
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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. Systematic 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 of -1.12(21)% based on chiral perturbation theory and adopted by the Particle Data Group.
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