Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Quentin Mason"'
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 140:713-715
The strong coupling constant is computed from three-loop lattice perturbation theory for eight Wilson loops and six Creutz ratios. Three lattice spacings of the MILC 2+1 unquenched lattice data sets were used to perform a continuum extrapolation and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::719ac061addd74000cbb65ecfe81583d
https://doi.org/10.1016/j.nuclphysbps.2004.11.300
https://doi.org/10.1016/j.nuclphysbps.2004.11.300
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 119:317-319
We present results on the sum of the masses of light and strange quark using improved staggered quarks. Our calculation uses 2+1 flavours of dynamical quarks. The effects of the dynamical quarks are clearly visible.
Comment: Lattice2002(spectrum
Comment: Lattice2002(spectrum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e6d5001f04d857e71f0ff2763231623
https://doi.org/10.1016/s0920-5632(03)01529-9
https://doi.org/10.1016/s0920-5632(03)01529-9
Publikováno v:
Physical Review D. 76
The effects of unquenching on the perturbative improvement coefficients in the Symanzik action are computed within the framework of L\"uscher-Weisz on-shell improvement. We find that the effects of quark loops are surprisingly large, and their omissi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85bb4181fe73f5569f8d9ab0d4dc85ec
https://doi.org/10.1103/physrevd.76.034507
https://doi.org/10.1103/physrevd.76.034507
Autor:
Quentin Mason, Howard D. Trottier, K. Hornbostel, E. Follana, Kaven Henry Yau Wong, Junko Shigemitsu, Christine Davies, G. P. Lepage
Publikováno v:
Physical Review D. 75
We use perturbative Symanzik improvement to create a new staggered-quark action (HISQ) that has greatly reduced one-loop taste-exchange errors, no tree-level order a^2 errors, and no tree-level order (am)^4 errors to leading order in the quark's velo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::08e6da442f464db6dc9235c41a444889
https://doi.org/10.1103/physrevd.75.054502
https://doi.org/10.1103/physrevd.75.054502
Autor:
M. Nobes, Peter Lepage, Christine Davies, Quentin Mason, Emel Gulez, Junko Shigemitsu, Alan Graya, Matthew Wingate
Publikováno v:
Scopus-Elsevier
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::559ab6624885beb3d04e4693bad21e85
https://doi.org/10.22323/1.020.0222
https://doi.org/10.22323/1.020.0222
Three-flavor lattice QCD simulations and two-loop perturbation theory are used to make the most precise determination to date of the strange-, up-, and down-quark masses, m{sub s}, m{sub u}, and m{sub d}, respectively. Perturbative matching is requir
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6723740dc21bfdc9c95e9aeb39b76f7c
http://arxiv.org/abs/hep-ph/0511160
http://arxiv.org/abs/hep-ph/0511160
Autor:
Junko Shigemitsu, G. P. Lepage, M. Nobes, Kerryann M. Foley, Alan Gray, Christine Davies, Quentin Mason, H. Trottier
Publikováno v:
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
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::599639c5b964f558cb4bafc4c15b8b44
https://doi.org/10.1103/physrevlett.95.052002
https://doi.org/10.1103/physrevlett.95.052002
Autor:
M. Nobes, G. Peter Lepage, Matthew Wingate, Quentin Mason, Emel Gulez, Alan Gray, Christine Davies, Junko Shigemitsu
Publikováno v:
Gray, A, Wingate, M, T. H. Davies, C, Gulez, E, Peter Lepage, G, Mason, Q, Nobes, M & Shigemitsu, J 2005, ' The B Meson Decay Constant from Unquenched Lattice QCD ', Physical Review Letters, vol. 95, no. 21 . https://doi.org/10.1103/PhysRevLett.95.212001
We present determinations of the B meson decay constant f_B and of the ratio f_{B_s}/f_B using the MILC collaboration unquenched gauge configurations which include three flavors of light sea quarks. The mass of one of the sea quarks is kept around th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ad73f68f8172cd54cbdacb789dc2350
Autor:
Eduardo Follana, Peter Lepage, Christine Davies, Howard D. Trottier, Quentin Mason, K. Hornbostel
The improved staggered quark action has enabled breakthrough calculations of QCD with three light dynamical quarks. The largest remaining $a^2$ scaling violations come from "taste-changing" interactions, which are significantly reduced over naive qua
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98f5e348d8d0871be65285d88c3bae83
http://arxiv.org/abs/hep-lat/0311004
http://arxiv.org/abs/hep-lat/0311004
Autor:
Howard D. Trottier, Eduardo Follana, J. Hein, Christine Davies, Quentin Mason, Paul B. Mackenzie, Peter Lepage
We present results from a systematic perturbative investigation of taste-changing in improved staggered quarks. We show one-loop taste-changing interactions can be removed perturbatively by an effective four-quark term and calculate the necessary coe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6803a706dbfe9bb8386ce01435bf1c98
http://arxiv.org/abs/hep-lat/0209152
http://arxiv.org/abs/hep-lat/0209152