2009/12/31 by Pietro Colangelo, Pietro Santorelli, E. Scrimieri +1
Physics and Astronomy · #Algorithm #Artificial intelligence #Black Holes and Theoretical Physics #Computer science #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.83.014016
published as Phys.Rev.D83:014016,2011 · 9 pages, 3 figure. Analysis of the errors reconsidered, one figure added, title modified, accepted for publication in Phys. Rev. D
openalex publication_date 2011/01/24 · arxiv created 2011/01/25 · arxiv updated 2011/02/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The measurement of the \ensuremathηb mass, together with a QCD result for the hyperfine splitting EHFS=M_\ensuremathΥ(1S)\ensuremath-M_\ensuremathηb, allows us to determine the strong coupling constant \ensuremathαs at a low energy scale. The result \ensuremathαs(M_\ensuremathΥ(1S))=0.197\ifmmode±\else\textpm\fi0.002|_\ensuremathΔEHFSexp\ifmmode±\else\textpm\fi0.002|scheme\ifmmode±\else\textpm\fi0.002|_\ensuremathδ⟨G2⟩\ifmmode±\else\textpm\fi0.006|_\ensuremathδmb\ifmmode±\else\textpm\fi0.005|ho, \ensuremathαs(M_Z0)=0.124\ifmmode±\else\textpm\fi0.001|_\ensuremathΔEHFSexp\ifmmode±\else\textpm\fi0.001|scheme\ifmmode±\else\textpm\fi0.001|_\ensuremathδ⟨G2⟩\ifmmode±\else\textpm\fi0.003|_\ensuremathδmb\ifmmode±\else\textpm\fi0.002|ho is compatible with the current world average of \ensuremathαs reported by the Particle Data Group, and shows that the experimental lowest-lying bb hyperfine splitting can be reproduced in terms of a perturbative and nonperturbative QCD contribution.