Precision measurements of <i>B</i>(<i>D</i><SUP>+</SUP> → μ<SUP>+</SUP>ν<sub>μ</sub>), the pseudoscalar decay constant <i>fD</i>+, and the quark mixing matrix element |<i>V</i><sub>cd</sub>|


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Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Ambrose D. J., An F. F., ...More

PHYSICAL REVIEW D, vol.89, no.5, 2014 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 89 Issue: 5
  • Publication Date: 2014
  • Doi Number: 10.1103/physrevd.89.051104
  • Journal Name: PHYSICAL REVIEW D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Bursa Uludag University Affiliated: No

Abstract

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.