Speaker
Description
Measurements at electron-positron colliders can probe the scale evolution of quark masses predicted by the Standard Model in several ways. LEP and SLD extracted $m_b(m_Z)$ from three jet rates in $Z\rightarrow b\bar{b}$ decay. A future $Z$-pole run can improve the precision considerably, while a measurement of $m_b$ at higher scale is possible from $e^+e^- \rightarrow b\bar{b}$ production at 250 GeV and above. A very precise determination of $m_b(m_H)$, with an uncertainty of 10s of MeV, can be achieved from measurements of Higgs decay rates in the Higgs factory runs at $\sqrt{s}$ = 250 GeV and 550 GeV.
In this contribution, we present the state-of-the-art extraction of $m_b(m_H)$ at the LHC, which is measured by the ATLAS experiment to be $2.73^{+0.27}_{-0.25}$ GeV, and provide updated projections for the HL-LHC and future colliders. We also present a proposal for an alternative methodology, where $m_b(m_H)$ and the bottom-quark Yukawa coupling are extracted simultaneously to provide a more model-independent result, as well as projections for the sensitivity of such extraction in a future electron-positron collider.