Precision Measurements of B(D⁺ → μ⁺ν_μ), the Pseudoscalar Decay Constant ʄ_D⁺ and the Quark Mixing Matrix Element |V_{cd}|

Date

2014-03

Authors

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

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Publisher

Amer Physical Soc

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Abstract

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

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Keywords

Mesons--Decay, Branching fractions (Nuclear physics), Beijing Spectrometer III), Beijing Electron–Positron Collider II

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©2014 American Physical Society

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