Direct measurement of the branching fraction for the decay of D+ ---> anti-K0 e+ nu(e) and determination of Gamma (D0 ---> K- e+ nu(e)) / Gamma (D+ ---> anti-K0 e+ nu(e))

Collaboration
Oct, 2004

Citations per year

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Abstract: (Elsevier)
The absolute branching fraction for the decay D+→K¯0e+νe is determined using 5321±149±160 singly tagged D− event sample from the data collected around 3.773 GeV with the BES-II detector at the BEPC collider. In the system recoiling against the singly tagged D− mesons, 34.4±6.1 events for D+→K¯0e+νe are observed. Those yield the absolute branching fraction to be BF(D+→K¯0e+νe)=(8.95±1.59±0.67)% . The ratio of the two partial widths for the decays of D0→K−e+νe and D+→K¯0e+νe is determined to be Γ(D0→K−e+νe)/Γ(D+→K¯0e+νe)=1.08±0.22±0.07 .
Note:
  • 6 pages, 6 figures, Submitted to Physics Letters B
  • electron positron: colliding beams
  • electron positron: annihilation
  • psi(3770): electroproduction
  • D: pair production
  • D+: semileptonic decay
  • D-: hadronic decay
  • D+: branching ratio
  • D+: width
  • D0: width
  • width: ratio