The Strong Coupling Constant

✍ Scribed by Quentin Mason; Howard Trottier; Christine Davies; Kerryann Foley; G. Peter Lepage

• Book ID: 104070996
• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 155 KB
• Volume: 140
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2004.11.300

✦ Synopsis

The strong coupling constant is computed from three-loop lattice perturbation theory for eight Wilson loops and six Creutz ratios. Three lattice spacings of the MILC 2+1 unquenched lattice data sets were used to perform a continuum extrapolation and estimate the higher order corrections. The light quark mass dependence is shown to be negligible. The static potential at two-loops for R/a ≤ 3 was used as a cross-check. The preliminary result is α MS (MZ) = 0.1175(15), which improves on the 2004 PDG world-average of 0.1187(20).