Prediction of the D_s^* width from a calculation of its radiative decay in full lattice QCD

Donald, G.C., Davies, C.T.H. , Koponen, J. and Lepage, G.P. (2014) Prediction of the D_s^* width from a calculation of its radiative decay in full lattice QCD. Physical Review Letters, 112(212002), (doi: 10.1103/PhysRevLett.112.212002)

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We determine the rate for D∗s→Dsγ for the first time from lattice QCD and include the full effect of u, d, and s sea quarks. The valence quarks are implemented by using the highly improved staggered quark formalism and we normalize the vector current nonperturbatively. We obtain M(D∗s)−M(Ds) of 148(4) MeV, in good agreement with experiment. The value of the decay constant of the D∗s we find to be 274(6) MeV, so that fD∗s/fDs=1.10(2). For the radiative decay, we find Γ(D∗s→Dsγ)=0.066(26)  keV. Given the experimental branching fraction for this decay, we predict a total width for the D∗s of 0.070(28) keV, making this the longest-lived charged vector meson. We also determine the branching fraction for D∗s leptonic decay to be 3.4(1.4)×10−5, putting it within the range of possible detection at next-generation flavor factories.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Koponen, Dr Jonna and Davies, Professor Christine
Authors: Donald, G.C., Davies, C.T.H., Koponen, J., and Lepage, G.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2014 American Physical Society
First Published:First published in Physical Review Letters 112(212002)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY