TY - JOUR
T1 - Charmed and light pseudoscalar meson decay constants from HISQ simulations
AU - Fermilab Lattice and MILC Collaborations
AU - Bazavov, A.
AU - Bernard, C.
AU - Bouchard, C.
AU - Detar, C.
AU - Du, D.
AU - El-Khadra, A. X.
AU - Foley, J.
AU - Freeland, E. D.
AU - Gámiz, E.
AU - Gottlieb, Steven
AU - Heller, U. M.
AU - Kim, J.
AU - Komijani, J.
AU - Kronfeldl, A. S.
AU - Laiho, J.
AU - Levkovad, L.
AU - Mackenzie, P. B.
AU - Neil, E. T.
AU - Simone, J. N.
AU - Sugar, R. L.
AU - Toussaint, D.
AU - Van De Water, S.
AU - Zhoul, R.
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
PY - 2014
Y1 - 2014
N2 - We compute the leptonic decay constants fD+, fDs, and fK+, and the quark-mass ratios mc/ms and ms/ml in unquenched lattice QCD. We use the MILC highly improved staggered quark (HISQ) ensembles with four dynamical quark flavors. Our primary results are fd+ = 212.6(0.4)(+1.0 -1.2) MeV, fDs = 249.0(0.3)(+1.1 1. 5) MeV, and fDs/fD+ = 1.1712(10)(+-29 -32), where the errors are statistical and total systematic, respectively. We also obtain fK+/fπ+ = 1.1956(10) (+-26 -18), updating our previous result, and determine the quark-mass ratios ms/ml = 27.35(5)(+10 -7) and mc/ms = 11.747(19)(+59 -43). When combined with experimental measurements of the decay rates, our results lead to precise determinations of the CKM matrix elements |Vus| = 0.22487(51)(29)(20)(5), |Vcd| = 0.217(1)(5)(1) and |Vcs| = 1.010(5)(18)(6), where the errors are from this calculation of the decay constants, the uncertainty in the experimental decay rates, structure-dependent electromagnetic corrections, and, in the case of |Vus|, the uncertainty in |Vud|, respectively.
AB - We compute the leptonic decay constants fD+, fDs, and fK+, and the quark-mass ratios mc/ms and ms/ml in unquenched lattice QCD. We use the MILC highly improved staggered quark (HISQ) ensembles with four dynamical quark flavors. Our primary results are fd+ = 212.6(0.4)(+1.0 -1.2) MeV, fDs = 249.0(0.3)(+1.1 1. 5) MeV, and fDs/fD+ = 1.1712(10)(+-29 -32), where the errors are statistical and total systematic, respectively. We also obtain fK+/fπ+ = 1.1956(10) (+-26 -18), updating our previous result, and determine the quark-mass ratios ms/ml = 27.35(5)(+10 -7) and mc/ms = 11.747(19)(+59 -43). When combined with experimental measurements of the decay rates, our results lead to precise determinations of the CKM matrix elements |Vus| = 0.22487(51)(29)(20)(5), |Vcd| = 0.217(1)(5)(1) and |Vcs| = 1.010(5)(18)(6), where the errors are from this calculation of the decay constants, the uncertainty in the experimental decay rates, structure-dependent electromagnetic corrections, and, in the case of |Vus|, the uncertainty in |Vud|, respectively.
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M3 - Conference Article
AN - SCOPUS:85030099940
SN - 1824-8039
VL - Part F130500
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 382
T2 - 32nd International Symposium on Lattice Field Theory, LATTICE 2014
Y2 - 23 June 2014 through 28 June 2014
ER -