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Precision measurements of B(D+ -> mu(+)nu(mu)), the pseudoscalar decay constant fD+, and the quark mixing matrix element vertical bar V-cd vertical bar
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2014 (English)In: Physical Review D, ISSN 1550-7998, Vol. 89, no 5, 051104- p.Article in journal (Refereed) Published
Abstract [en]

We report a measurement of the branching fraction B(D+ -> mu(+)nu(mu)) = [3.71 +/- 0.19(stat) +/- 0.06(sys)] x 10(-4) based on 2.92 fb(-1) of data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar determined from a global Standard Model fit, implies a value for the weak decay constant f(D+) = (203.2 +/- 5.3 +/- 1.8) MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for f(D+), we find vertical bar V-cd vertical bar 0.2210 +/- 0.0058 +/- 0.0047. In either case, these are the most precise results for these quantities to date.

Place, publisher, year, edition, pages
2014. Vol. 89, no 5, 051104- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-225093DOI: 10.1103/PhysRevD.89.051104ISI: 000334307600001OAI: oai:DiVA.org:uu-225093DiVA: diva2:719987
Available from: 2014-05-27 Created: 2014-05-27 Last updated: 2014-05-27Bibliographically approved

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Johansson, TordKupsc, AndrezejSchönning, KarinWolke, Magnus
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