Strong Running Coupling at τ and Z 0 Mass Scales from Lattice QCD
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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 ¿MS¯¯¯¯¯¯(m2¿) and ¿MS¯¯¯¯¯¯(m2Z) in very good agreement with experimental results. Including a dynamical c quark makes the needed running of ¿MS¯¯¯¯¯¯ safer.
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Blossier, B., Boucaud, Ph., Brinet, M., Soto Borrero, F.C., Du, X., Morenas, V., Pène, O., Petrov, K., Rodríguez Quintero, J.: "Strong Running Coupling at τ and Z 0 Mass Scales from Lattice QCD". Physical Review Letters. Vol. 108, n. 26, (2012). DOI: 10.1103/PhysRevLett.108.262002
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