Donald, G.C., Davies, C.T.H. , Dowdall, R.J., Follana, E., Hornbostel, K., Koponen, J., Lepage, G.P. and McNeile, C. (2012) Precision tests of the J/ψ from full lattice QCD: mass, leptonic width, and radiative decay rate to η_{c}. Physical Review D, 86(9), 094501. (doi: 10.1103/PhysRevD.86.094501)
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Abstract
We calculate the J/ψ mass, leptonic width and radiative decay rate to γηc from lattice QCD including u, d and s quarks in the sea for the first time. We use the highly improved staggered quark formalism and nonperturbatively normalized vector currents for the leptonic and radiative decay rates. Our results are: MJ/ψ-Mηc=116.5(3.2) MeV; Γ(J/ψ→e+e-)=5.48(16) keV; Γ(J/ψ→γηc)=2.49(19) keV. The first two are in good agreement with experiment, with Γ(J/ψ→e+e-) providing a test of a decay matrix element in QCD, independent of Cabibbo-Kobayashi-Maskawa uncertainties, to 2%. At the same time results for the time moments of the correlation function can be compared to values from the charm contribution to σ(e+e-→hadrons), giving a 1.5% test of QCD. Our results show that an improved experimental error would enable a similarly strong test from Γ(J/ψ→γηc).
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Dowdall, Dr Rachel and Koponen, Dr Jonna and Davies, Professor Christine |
Authors: | Donald, G.C., Davies, C.T.H., Dowdall, R.J., Follana, E., Hornbostel, K., Koponen, J., Lepage, G.P., and McNeile, C. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Physical Review D |
Publisher: | American Physical Society |
ISSN: | 1550-7998 |
Published Online: | 02 November 2012 |
Copyright Holders: | Copyright © 2012 American Physical Society |
First Published: | First published in Physical Review D 86(9):094501 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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