The charm/bottom quark mass from heavy quarkonium at N$^3$LO

TL;DR

This paper accurately determines charm and bottom quark masses and the strong coupling constant using high-order perturbative calculations of heavy quarkonium states, employing renormalon subtraction and exploring different computational schemes.

Contribution

It provides the first N$^3$LO perturbative determination of heavy quark masses from quarkonium energies, controlling renormalon effects and comparing computational schemes.

Findings

Charm mass: 1223(33) MeV

Bottom mass: 4186(37) MeV

Alpha_s(M_z)=0.1195(53)

Abstract

We determine the charm and bottom quark masses using the N$^3$LO perturbative expression of the ground state (pseudoscalar) energy of the bottomonium, charmonium and $B_c$ systems: the $\eta_b$, $\eta_c$ and $B_c$ masses. We work in the renormalon subtracted scheme, which allows us to control the divergence of the perturbation series due to the pole mass renormalon. Our result for the $\overline{\rm MS}$ masses reads ${\overline m}_{c}({\overline m}_{c})=1223(33)$ MeV and ${\overline m}_{b}({\overline m}_{b})=4186(37)$ MeV. We also extract a value of $\alpha_s$ from a renormalon-free combination of the $\eta_b$, $\eta_c$ and $B_c$ masses: $\alpha_s(M_z)=0.1195(53)$. We explore the applicability of the weak coupling approximation to bottomonium $n=2$ states. Finally, we consider an alternative computational scheme that treats the static potential exactly and study its convergence properties.