title: Strong running coupling at τ and Z(0) mass scales from lattice QCD.
abstract: This Letter reports on the first computation, from data obtained in lattice QCD with u, d, s, and c quarks in the sea, of the running strong coupling via the ghost-gluon coupling renormalized in the momentum-subtraction Taylor scheme. We provide readers with estimates of α(MS[over ¯])(m(τ)(2)) and α(MS[over ¯])(m(Z)(2)) in very good agreement with experimental results. Including a dynamical c quark makes the needed running of α(MS[over ¯]) safer.
authors.affiliation: Laboratoire de Physique Théorique, Université de Paris XI, Bâtiment 210, 91405 Orsay Cedex, France.
authors.forename: B
authors.initials: B
authors.lastname: Blossier
authors.forename: Ph
authors.initials: P
authors.lastname: Boucaud
authors.forename: M
authors.initials: M
authors.lastname: Brinet
authors.forename: F
authors.initials: F
authors.lastname: De Soto
authors.forename: X
authors.initials: X
authors.lastname: Du
authors.forename: V
authors.initials: V
authors.lastname: Morenas
authors.forename: O
authors.initials: O
authors.lastname: Pène
authors.forename: K
authors.initials: K
authors.lastname: Petrov
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez-Quintero