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Accurate Determinations of $alpha_s$ from Realistic Lattice QCD | | Q. Mason
; H.D. Trottier
; C.T.H. Davies
; K. Foley
; A. Gray
; G. P. Lepage
; M. Nobes
; J. Shigemitsu
; | | Date: |
7 Mar 2005 | | Journal: | Phys.Rev.Lett. 95 (2005) 052002 | | Subject: | hep-lat hep-ph | | Abstract: | We obtain a new value for the QCD coupling constant by combining lattice QCD simulations with experimental data for hadron masses. Our lattice analysis is the first to: 1) include vacuum polarization effects from all three light-quark flavors (using MILC configurations); 2) include third-order terms in perturbation theory; 3) systematically estimate fourth and higher-order terms; 4) use an unambiguous lattice spacing; and 5) use an $order(a^2)$-accurate QCD action. We use 28~different (but related) short-distance quantities to obtain $alpha_{ar{mathrm{MS}}}^{(5)}(M_Z) = 0.1170(12)$. | | Source: | arXiv, hep-lat/0503005 | | Services: | Forum | Review | PDF | Favorites | |
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