Accurate Determinations ofαsfrom Realistic Lattice QCD
| Autor: | Junko Shigemitsu, G. P. Lepage, M. Nobes, Kerryann M. Foley, Alan Gray, Christine Davies, Quentin Mason, H. Trottier |
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| Rok vydání: | 2005 |
| Předmět: |
Quantum chromodynamics
Physics Particle physics Chiral perturbation theory 010308 nuclear & particles physics High Energy Physics::Lattice High Energy Physics::Phenomenology QCD vacuum Lattice field theory General Physics and Astronomy Lattice QCD 01 natural sciences Lattice constant Lattice gauge theory 0103 physical sciences High Energy Physics::Experiment Vacuum polarization 010306 general physics |
| Zdroj: | Mason, Q, D. Trottier, H, T. H. Davies, C, Foley, K, Gray, A, P. Lepage, G, Nobes, M & Shigemitsu, J 2005, ' Accurate Determinations of $α_s$ from Realistic Lattice QCD ', Physical Review Letters, vol. 95, no. 5 . https://doi.org/10.1103/PhysRevLett.95.052002 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.95.052002 |
| Popis: | 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 $\alpha_{\bar{\mathrm{MS}}}^{(5)}(M_Z) = 0.1170(12)$. |
| Databáze: | OpenAIRE |
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