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Improved measurement of the absolute branching fraction of D+→Kˉ0μ+νμD^{+}\rightarrow \bar{K}^0 \mu ^{+}\nu _{\mu }

Collaboration
Apr 30, 2016
9 pages
Published in:
  • Eur.Phys.J.C 76 (2016) 7, 369
  • Published: Jul 4, 2016
e-Print:
DOI:
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Abstract: (Springer)
By analyzing 2.93 fb−1^{-1} of data collected at s=3.773\sqrt{s}=3.773 GeV with the BESIII detector, we measure the absolute branching fraction B(D+→Kˉ0μ+νμ)=(8.72±0.07stat.±0.18sys.)%{\mathcal B}(D^{+}\rightarrow \bar{K}^0\mu ^{+}\nu _{\mu })=(8.72 \pm 0.07_\mathrm{stat.} \pm 0.18_\mathrm{sys.})\% , which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of B(D0→K−μ+νμ){\mathcal B}(D^0\rightarrow K^-\mu ^+\nu _\mu ) , B(D+→Kˉ0e+νe){\mathcal B}(D^{+}\rightarrow \bar{K}^0 e^{+}\nu _{e}) , and the lifetimes of the D0D^0 and D+D^+ mesons with the value of B(D+→Kˉ0μ+νμ){\mathcal B}(D^{+}\rightarrow \bar{K}^0 \mu ^{+}\nu _{\mu }) measured in this work, we determine the following ratios of partial widths: Γ(D0→K−μ+νμ)/Γ(D+→Kˉ0μ+νμ)=0.963±0.044\Gamma (D^0\rightarrow K^-\mu ^+\nu _\mu )/\Gamma (D^{+}\rightarrow \bar{K}^0\mu ^{+}\nu _{\mu })=0.963\pm 0.044 and Γ(D+→Kˉ0μ+νμ)/Γ(D+→Kˉ0e+νe)=0.988±0.033\Gamma (D^{+}\rightarrow \bar{K}^0 \mu ^{+}\nu _{\mu })/\Gamma (D^{+}\rightarrow \bar{K}^0 e^{+}\nu _{e})=0.988\pm 0.033 .
Note:
  • 9 pages; 8 figures
  • electron positron: annihilation
  • electron positron: colliding beams
  • D+: semileptonic decay
  • D+: branching ratio
  • branching ratio: ratio
  • width: ratio
  • D: lifetime
  • BES
  • Beijing Stor
  • experimental results