$\mathcal{O}(\alpha {\alpha }_s^2)$ corrections to the Top Quark mass

Abstract

We calculate the three-loop $\mathcal{O}(\alpha {\alpha }_s^2)$ mixed QCD-EW corrections to the top quark mass and obtain the relationships between the pole ($M_t$) and $\overline{\mathrm{MS}}$ ($m_t(\mu )$) masses at this order. In performing our calculation, we express the three-loop self-energies as a function of three-loop master integrals (MIs). These MIs are defined so as to solve a differential equation in $\epsilon$-factorized form, allowing for their solution to be expressed as iterated integrals. We discuss the types of differential forms that we encounter, which include periods of elliptic curves, and their role in the final physical result. Using our results, we calculate the shift in $m_t(M_t)$ arising at this order. For $M_t=172.3$ GeV, the shift is -216 MeV, which is comparable to the currently quoted experimental uncertainty.

8 pages, 2 figures