Hyperfine splitting in the bottomonium system on the lattice and in the continuum
Abstract
The latest experimental measurements of the hyperfine splitting Ehfs=M(1 S)-Mηb(1 S) done by the Belle collaboration and the perturbative and lattice QCD predictions show a tension with the current extraction within lattice non-relativistic QCD. In this talk we revise the analysis of radiative corrections to the bottomonium hyperfine splitting within lattice non-relativistic QCD at the next-to-leading order. The result of the analysis is in good agreement with the perturbative and lattice QCD result as well as the direct measurement.
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