Yayın: Precision measurements of B(D+ → μ+νμ), the pseudoscalar decay constant fD+, and the quark mixing matrix element |Vcd|
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Tarih
Kurum Yazarları
Yazarlar
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.
Danışman
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Türü
Yayıncı:
Amer Physical
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Özet
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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Konusu
Mesons, Astronomy & astrophysics, Physics
