Charmed and light pseudoscalar meson decay constants from HISQ simulations

Fermilab Lattice and MILC Collaborations

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Article number382
JournalProceedings of Science
VolumePart F130500
StatePublished - 2014

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mesons
quarks
decay
mass ratios
decay rates
simulation
quantum chromodynamics
electromagnetism
matrices

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  • General

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Fermilab Lattice and MILC Collaborations (2014). Charmed and light pseudoscalar meson decay constants from HISQ simulations. Proceedings of Science, Part F130500, [382].

Charmed and light pseudoscalar meson decay constants from HISQ simulations. / Fermilab Lattice and MILC Collaborations.

In: Proceedings of Science, Vol. Part F130500, 382, 2014.

Research output: Contribution to journalArticle

Fermilab Lattice and MILC Collaborations 2014, 'Charmed and light pseudoscalar meson decay constants from HISQ simulations', Proceedings of Science, vol. Part F130500, 382.
Fermilab Lattice and MILC Collaborations. Charmed and light pseudoscalar meson decay constants from HISQ simulations. Proceedings of Science. 2014;Part F130500. 382.
Fermilab Lattice and MILC Collaborations. / Charmed and light pseudoscalar meson decay constants from HISQ simulations. In: Proceedings of Science. 2014 ; Vol. Part F130500.
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title = "Charmed and light pseudoscalar meson decay constants from HISQ simulations",
abstract = "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.",
author = "{Fermilab Lattice and MILC Collaborations} and A. Bazavov and C. Bernard and C. Bouchard and C. Detar and D. Du and El-Khadra, {A. X.} and J. Foley and Freeland, {E. D.} and E. G{\'a}miz and Steven Gottlieb and Heller, {U. M.} and J. Kim and J. Komijani and Kronfeldl, {A. S.} and J. Laiho and L. Levkovad and Mackenzie, {P. B.} and Neil, {E. T.} and Simone, {J. N.} and Sugar, {R. L.} and Toussaint, {William D} and {Van De Water}, S. and R. Zhoul",
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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, William D

AU - Van De Water, S.

AU - Zhoul, R.

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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