Dec 14 – 15, 2023
Centre for Particle Theory
Europe/London timezone

The Semi-Leptonic Weak Hamiltonian: Going Beyond Two-Loops

Dec 15, 2023, 9:10 AM
Ph30 (Centre for Particle Theory)


Centre for Particle Theory

Long Talk (20 mins) QFT: The Standard Model


Francesco Moretti (University of Liverpool)


The unitarity condition of the Cabibbo-Kobayashi-Maskawa provides an important precision test of the Standard Model. This test requires a good control of different theoretical contributions. In our work, we discuss the short-distance corrections to the weak effective theory as well as the lattice-to-continuum matching for the semi-leptonic four-fermion operator. We compare different renormalization schemes used in the computation of these radiative corrections, namely the $W$-Mass scheme and the $\overline{\rm MS}$ scheme. We also discuss the calculation of the two-loop $\mathcal{O}(\alpha \alpha_s)$ electroweak corrections and the corresponding three-loop $\mathcal{O}(\alpha\alpha_s^2)$ anomalous dimension for the effective theory Wilson coefficient. We also present numerical results for the $\mathcal{O}(\alpha \alpha_s)$ conversion factor to the regularisation independent scheme, which is used in Lattice calculations.

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Primary author

Francesco Moretti (University of Liverpool)

Presentation materials