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

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, S. Braun, R. A. Briere, H. Cai, X. CaiO. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. Dedovich, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, W. M. Ding, Y. Ding, C. Dong, H. Muramatsu, R. Poling, BESIII Collaboration

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

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

Original languageEnglish (US)
Article number051104
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number5
DOIs
StatePublished - Mar 28 2014

Fingerprint Dive into the research topics of 'Precision measurements of B (D+ →μ+νμ), the pseudoscalar decay constant fD+, and the quark mixing matrix element |Vcd |'. Together they form a unique fingerprint.

  • Cite this

    Ablikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Ambrose, D. J., An, F. F., An, Q., Bai, J. Z., Baldini Ferroli, R., Ban, Y., Bennett, J. V., Bertani, M., Bian, J. M., Boger, E., Bondarenko, O., Boyko, I., Braun, S., Briere, R. A., Cai, H., ... BESIII Collaboration (2014). Precision measurements of B (D+ →μ+νμ), the pseudoscalar decay constant fD+, and the quark mixing matrix element |Vcd |. Physical Review D - Particles, Fields, Gravitation and Cosmology, 89(5), [051104]. https://doi.org/10.1103/PhysRevD.89.051104