TY - JOUR
T1 - Update
T2 - Accurate determinations of αs from realistic lattice QCD
AU - Davies, C. T.H.
AU - Hornbostel, K.
AU - Kendall, I. D.
AU - Lepage, G. P.
AU - McNeile, C.
AU - Shigemitsu, J.
AU - Trottier, H.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - We use lattice QCD simulations, with MILC configurations (including vacuum polarization from u, d, and s quarks), to update our previous determinations of the QCD coupling constant. Our new analysis uses results from 6 different lattice spacings and 12 different combinations of sea-quark masses to significantly reduce our previous errors. We also correct for finite-lattice-spacing errors in the scale setting, and for nonperturbative chiral corrections to the 22 short-distance quantities from which we extract the coupling. Our final result is αV(7.5GeV,nf=3)=0.2120(28), which is equivalent to αMS̄(MZ,nf=5)=0.1183(8). We compare this with our previous result from Wilson loops, which differs by one standard deviation.
AB - We use lattice QCD simulations, with MILC configurations (including vacuum polarization from u, d, and s quarks), to update our previous determinations of the QCD coupling constant. Our new analysis uses results from 6 different lattice spacings and 12 different combinations of sea-quark masses to significantly reduce our previous errors. We also correct for finite-lattice-spacing errors in the scale setting, and for nonperturbative chiral corrections to the 22 short-distance quantities from which we extract the coupling. Our final result is αV(7.5GeV,nf=3)=0.2120(28), which is equivalent to αMS̄(MZ,nf=5)=0.1183(8). We compare this with our previous result from Wilson loops, which differs by one standard deviation.
UR - http://www.scopus.com/inward/record.url?scp=58649087382&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.78.114507
DO - 10.1103/PhysRevD.78.114507
M3 - Article
AN - SCOPUS:58649087382
SN - 1550-7998
VL - 78
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 11
M1 - 114507
ER -