High-precision charm-quark mass and QCD coupling from current-current correlators in lattice and continuum QCD

I. Allison*, E. Dalgic, C. T.H. Davies, E. Follana, R. R. Horgan, K. Hornbostel, G. P. Lepage, C. McNeile, J. Shigemitsu, H. Trottier, R. M. Woloshyn, K. G. Chetyrkin, J. H. Kühn, M. Steinhauser, C. Sturm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We use lattice QCD simulations, with MILC gluon configurations and HISQ c-quark propagators, to make very precise determinations of moments of charm-quark pseudoscalar, vector and axial-vector correlators. These moments are combined with new four-loop results from continuum perturbation theory to obtain several new determinations of the MS̄ mass of the charm quark and of the MS̄ coupling. We find mc(3GeV)=0.986(10)GeV, or, equivalently, mc(mc)=1.268(9)GeV, both for nf=4 flavors; and αMS̄(3GeV,nf=4)=0. 251(6), or, equivalently, αMS̄(MZ,nf=5)=0.1174(12). The new mass agrees well with results from continuum analyses of the vector correlator using experimental data for e+e- annihilation (instead of using lattice QCD simulations). These lattice and continuum results are the most accurate determinations to date of this mass. Ours is also one of the most accurate determinations of the QCD coupling by any method.

Original languageEnglish
Article number054513
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number5
DOIs
Publication statusPublished - 29 Sept 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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