Speaker
Description
The Standard Model prediction for the Higgs boson coupling to the b quark requires as input the running b quark mass evaluated at the scale of m_H. The running is large effect, reducing the prediction for the Yukawa coupling to 60% of the value that would be predicted from the nominal (PDG) value of the b quark mass. In this talk, we will discuss the theory uncertainties in the calculation of running of the b quark mass and the possibility of testing this theory at e+e- colliders with higher-precision measurements at the Z resonance and in Higgs and 4-fermion processes at 250 GeV. We present a measurement of the bottom quark mass at the scale of mH, extracted from ATLAS and CMS measurements of Higgs couplings, and the prospects for future improvements at the HL-LHC and a future Higgs factory.
