Direct measurement of the pseudoscalar decay constant f(D+)

Collaboration
Oct, 2004

Citations per year

2004200920142019202402468
Abstract: (Elsevier)
The absolute branching fraction for the decay D+→μ+ν has been directly measured based on a data sample of about 33 pb −1 collected around s=3.773 GeV with the BES-II detector at the BEPC collider. A total of 5321±149±160 D− mesons are reconstructed in nine hadronic decay modes. In the system recoiling against these singly tagged D− mesons, 2.67±1.74 purely leptonic decay events of D+→μ+νμ are observed. Those yield the branching fraction of BF(D+→μ+νμ)=(0.122−0.053+0.111±0.010)% , and a corresponding value of the pseudoscalar decay constant fD+=(371−119+129±25) MeV .
Note:
  • 7 pages, 8 figures, Submitted to Physics Letters B in October, 2004
  • electron positron: colliding beams
  • electron positron: annihilation
  • psi(3770): electroproduction
  • D: pair production
  • D-: hadronic decay
  • D+: leptonic decay
  • D+: decay constant
  • D+: branching ratio
  • BES
  • experimental results