Anti-CKM polyclonal antibody

The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour observables can be affected by physics beyond the Standard Model (SM). We provide a general roadmap to take this into account, which we apply to the case of the Standard Model Effective Field Theory (SMEFT). We choose a set of four input observables that determine the four Wolfenstein parameters, and discuss how the effects of dimension-six operators can be included in their definition. We provide numerical values and confidence intervals for the CKM parameters, and compare them with the results of CKM fits obtained in the SM context. Our approach allows one to perform general SMEFT analyses in a consistent fashion, independently of any assumptions about the way new physics affects flavour observables. We discuss a few examples illustrating how our approach can be implemented in practice.

We present analytical calculations of the as corrections for the coefficient of rho(D)/m(Q)(3) term in the heavy quark expansion for the inclusive semileptonic decays of heavy hadrons such as B -> X(c)l (v) over bar. The full dependence of the coefficient on the final-state quark mass is taken into account. Our result leads to further improvement of theoretical predictions for the precision determination of CKM matrix element vertical bar V-cb vertical bar.