A new determination of the mass of a b-quark (sometimes called a bottom quark and sometimes called a beauty quark) incorporating electromagnetic effects rather than merely strong force interactions for the first time, largely confirms prior estimates.
The Particle Data Group global average is 4.18 + 0.03 - 0.03 GeV.
We extend HPQCD's earlier lattice-QCD analysis of the ratio of masses of the and quark to include results from finer lattices (down to 0.03fm) and a new calculation of QED contributions to the mass ratio. We find that at renormalization scale \,GeV. This result is nonperturbative. Combining it with HPQCD's recent lattice QCDQED determination of gives a new value for the -quark mass: GeV. The -mass corresponds to GeV. These results are the first based on simulations that include QED.
D. Hatton, et al., "Determination of m(b)/m(c) and m(b) from n(f)=4 lattice QCD+QED" arXiv:2102.09609 [hep-lat] (February 18, 2021).