TY - JOUR
T1 - High-precision charm-quark mass and QCD coupling from current-current correlators in lattice and continuum QCD
AU - Allison, I.
AU - Dalgic, E.
AU - Davies, C. T.H.
AU - Follana, E.
AU - Horgan, R. R.
AU - Hornbostel, K.
AU - Lepage, G. P.
AU - McNeile, C.
AU - Shigemitsu, J.
AU - Trottier, H.
AU - Woloshyn, R. M.
AU - Chetyrkin, K. G.
AU - Kühn, J. H.
AU - Steinhauser, M.
AU - Sturm, C.
PY - 2008/9/29
Y1 - 2008/9/29
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=53349151444&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.78.054513
DO - 10.1103/PhysRevD.78.054513
M3 - Article
AN - SCOPUS:53349151444
SN - 1550-7998
VL - 78
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 5
M1 - 054513
ER -