6533b829fe1ef96bd128acbf
RESEARCH PRODUCT
Improved $K_{e3}$ radiative corrections sharpen the $K_{\mu 2}$--$K_{l3}$ discrepancy
Daniel GalvizUlf-g. MeißnerUlf-g. MeißnerChien Yeah SengMikhail Gorchteinsubject
PhysicsNuclear and High Energy PhysicsParticle physicsNuclear Theory010308 nuclear & particles physicsPhysics beyond the Standard ModelElectroweak interactionLattice QCDLattice QCDQC770-79801 natural sciencesStandard ModelHigh Energy Physics - ExperimentKaon PhysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - LatticeNuclear and particle physics. Atomic energy. Radioactivity0103 physical sciencesRadiative transferPrecision QEDHigh Energy Physics::Experiment010306 general physicsNuclear ExperimentOrder of magnitudedescription
The measurements of $V_{us}$ in leptonic $(K_{\mu 2})$ and semileptonic $(K_{l3})$ kaon decays exhibit a $3\sigma$ disagreement, which could originate either from physics beyond the Standard Model or some large unidentified Standard Model systematic effects. Clarifying this issue requires a careful examination of all existing Standard Model inputs. Making use of a newly-proposed computational framework and the most recent lattice QCD results, we perform a comprehensive re-analysis of the electroweak radiative corrections to the $K_{e3}$ decay rates that achieves an unprecedented level of precision of $10^{-4}$, which improves the current best results by almost an order of magnitude. No large systematic effects are found, which suggests that the electroweak radiative corrections should be removed from the ``list of culprits'' responsible for the $K_{\mu 2}$--$K_{l3}$ discrepancy.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-11-01 |