scholarly journals Chiral perturbation theory for B→D and B→D semileptonic transition matrix elements at zero recoil

1993 ◽  
Vol 303 (1-2) ◽  
pp. 135-139 ◽  
Author(s):  
Lisa Randall ◽  
Mark B. Wise
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Transition Matrix ◽  
Matrix Elements ◽  
Chiral Perturbation ◽  
Transition Matrix Elements

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

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Chien-Yeah Seng ◽  
Xu Feng ◽  
Mikhail Gorchtein ◽  
Lu-Chang Jin ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Lattice Qcd ◽  
Beta Decay ◽  
Chiral Perturbation Theory ◽  
Low Energy ◽  
Matrix Elements ◽  
Chiral Perturbation ◽  
Electromagnetic Effects ◽  
Beta Decays ◽  
Energy Constants

Abstract 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.

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