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Precision measurements of B(D+ → μ+νμ), the pseudoscalar decay constant fD+, and the quark mixing matrix element |Vcd|

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Ablikim, M.
Achasov, M. N.
Ai, X. C.
Albayrak, O.
Ambrose, D. J.
An, F. F.
An, Q.
Bai, J. Z.
Ferroli, R. Baldini
Ban, Y.

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Amer Physical

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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.

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Mesons, Astronomy & astrophysics, Physics

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