On the difference between the pole and the MSbar masses of the top quark at the electroweak scale

TL;DR

This paper discusses how electroweak radiative corrections at the Higgs mass of 125 GeV reduce the difference between the pole and MS-bar top quark masses to about 1 GeV, impacting precision measurements.

Contribution

It provides a detailed analysis of electroweak corrections to the top quark mass scheme dependence at the electroweak scale, especially around M_H ~125 GeV.

Findings

Electroweak corrections reduce the mass difference to about 1 GeV.

Reconstructed invariant mass is close to the pole mass.

Total cross section analysis yields a precise MS-bar mass.

Abstract

We argue that for a Higgs boson mass M_H ~125 GeV, as suggested by recent Higgs searches at the LHC, the inclusion of electroweak radiative corrections in the relationship between the pole and MS-bar masses of the top quark reduces the difference to about 1 GeV. This is relevant for the scheme dependence of electroweak observables, such as the rho parameter, as well as for the extraction of the top quark mass from experimental data. In fact, the value currently extracted by reconstructing the invariant mass of the top quark decay products is expected to be close to the pole mass, while the analysis of the total cross section of top quark pair production yields a clean determination of the MS-bar mass.