Update: Precision Ds decay constant from full lattice QCD using very fine lattices

Davies, C. , McNeile, C., Follana, E., Lepage, G., Na, H. and Shigemitsu, J. (2010) Update: Precision Ds decay constant from full lattice QCD using very fine lattices. Physical Review D, 82(11), (doi: 10.1103/PhysRevD.82.114504)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevD.82.114504

Abstract

We update our previous determination of both the decay constant and the mass of the D<sub>s</sub> meson using the highly improved staggered quark formalism. We include additional results at two finer values of the lattice spacing along with improved determinations of the lattice spacing and improved tuning of the charm and strange quark masses. We obtain m<sub>D</sub><sub>s</sub>=1.9691(32)  GeV, in good agreement with experiment, and f<sub>D</sub><sub>s</sub>=0.2480(25)  GeV. Our result for f<sub>D</sub><sub>s</sub> is 1.6σ lower than the most recent experimental average determined from the Ds leptonic decay rate and using V<sub>cs</sub> from Cabibbo-Kobayashi-Maskawa unitarity. Combining our f<sub>D</sub><sub>s</sub> with the experimental rate we obtain a direct determination of V<sub>cs</sub>=1.010(22), or alternatively 0.990+0.013/-0.016 using a probability distribution for statistical errors for this quantity which vanishes above 1. We also include an accurate prediction of the decay constant of the η<sub>c</sub>, f<sub>ηc</sub>=0.3947(24)  GeV, as a calibration point for other lattice calculations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McNeile, Dr Craig and Davies, Professor Christine
Authors: Davies, C., McNeile, C., Follana, E., Lepage, G., Na, H., and Shigemitsu, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1089-4918

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
481951Investigations in Quantum Chromodynamics and Physics Beyond the Standard ModelChristine DaviesScience & Technologies Facilities Council (STFC)ST/G00059X/1Physics and Astronomy