6533b822fe1ef96bd127d56a
RESEARCH PRODUCT
Updated Standard Model Prediction for ε′/ε
Hector GisbertAntonio Pichsubject
PhysicsNuclear and High Energy PhysicsParticle physicsPion010308 nuclear & particles physicsLattice (order)0103 physical sciencesCP violationComplete Agreement010306 general physics01 natural sciencesdescription
Abstract A recent lattice evaluation of e ′ / e , finding a 2.1 σ deviation from the experimental value, has revived the old debate about a possible e ′ / e anomaly. The unfounded claims of a too low Standard Model prediction are based on incorrect estimates that neglect the long-distance re-scattering of the final pions in K → 2 π . In view of the current situation, we have recently updated the Standard Model calculation, including all known short- and long-distance contributions. Our result, Re ( e ′ / e ) = ( 15 ± 7 ) ⋅ 10 − 4 [H. Gisbert and A. Pich, “Direct CP violation in K 0 → π π : Standard Model Status”, Rept. Prog. Phys. 81 (2018) no. 7, 076201 arXiv:1712.06147 [hep-ph] .], is in complete agreement with the experimental measurement.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-07-01 | Nuclear and Particle Physics Proceedings |