Direct measurement of the pseudoscalar decay constant f(D+)
Oct, 20047 pages
Published in:
- Phys.Lett.B 610 (2005) 183-191
e-Print:
- hep-ex/0410050 [hep-ex]
Experiments:
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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
References(16)
Figures(9)