New method for calculating electromagnetic effects in semileptonic beta-decays of mesons

Journal of High Energy Physics

Mikhail Gorchtein¹  Chien-Yeah Seng²  Ulf-G. Meißner³  Lu-Chang Jin⁴  Xu Feng⁵ 

[1] Helmholtz Institute Mainz, D-55099, Mainz, Germany;GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany;Johannes Gutenberg University, D-55099, Mainz, Germany;Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany;Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany;Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany;Tbilisi State University, 0186, Tbilisi, Georgia;RIKEN-BNL Research Center, Brookhaven National Lab, 11973, Upton, NY, USA;Physics Department, University of Connecticut, 06269-3046, Storrs, Connecticut, USA;School of Physics, Peking University, 100871, Beijing, China;Collaborative Innovation Center of Quantum Matter, 100871, Beijing, China;Center for High Energy Physics, Peking University, 100871, Beijing, China;State Key Laboratory of Nuclear Physics and Technology, Peking University, 100871, Beijing, China;

关键词: Chiral Lagrangians;    Kaon Physics;    Lattice QCD;    Precision QED;   

DOI  :  10.1007/JHEP10(2020)179

来源: Springer

【 摘 要 】

We construct several classes of hadronic matrix elements and relate them to the low-energy constants in Chiral Perturbation Theory that describe the electromagnetic effects in the semileptonic beta decay of the pion and the kaon. We propose to calculate them using lattice QCD, and argue that such a calculation will make an immediate impact to a number of interesting topics at the precision frontier, including the outstanding anomalies in |Vus| and the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.

【 授权许可】

CC BY