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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KünyeAblikim, M., Achasov, M. N., Ai, X.C., Albayrak, O., Ambrose, D. J., An, F. F. ... BESIII Collaboration. (2014). 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. Physical Review D, 89 (5), 6p. http://dx.doi.org/10.1103/PhysRevD.89.051104.
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.