Update: Accurate determinations of αs from realistic lattice QCD

C. T.H. Davies; K. Hornbostel; I. D. Kendall; G. P. Lepage; C. McNeile; J. Shigemitsu; H. Trottier

doi:10.1103/PhysRevD.78.114507

Update: Accurate determinations of αs from realistic lattice QCD

C. T.H. Davies, K. Hornbostel, I. D. Kendall, G. P. Lepage, C. McNeile, J. Shigemitsu, H. Trottier

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	114507
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	78
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.78.114507
Publication status	Published - 1 Dec 2008
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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title = "Update: Accurate determinations of αs from realistic lattice QCD",

abstract = "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 αM{\=S}(MZ,nf=5)=0.1183(8). We compare this with our previous result from Wilson loops, which differs by one standard deviation.",

author = "Davies, {C. T.H.} and K. Hornbostel and Kendall, {I. D.} and Lepage, {G. P.} and C. McNeile and J. Shigemitsu and H. Trottier",

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language = "English",

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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

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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.

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Update: Accurate determinations of αs from realistic lattice QCD

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