Direct measurement of the pseudoscalar decay constant f(D+)
- Ablikim, M
- Bai, JZ
- Ban, Y
- Bian, JG
- Cai, X
- Chang, JF
- Chen, HF
- Chen, HS
- Chen, HX
- Chen, JC
- Chen, J
- Chen, J
- Chen, ML
- Chen, YB
- Chi, SP
- Chu, YP
- Cui, XZ
- Dai, HL
- Dai, YS
- Deng, ZY
- Dong, LY
- Dong, QF
- Du, SX
- Du, ZZ
- Fang, J
- Fang, SS
- Fu, CD
- Fu, H
- Gao, CS
- Gao, YN
- Gong, MY
- Gong, WX
- Gu, SD
- Guo, YN
- Guo, YQ
- He, KL
- He, M
- He, X
- Heng, YK
- Hu, HM
- Hu, T
- Huang, XP
- Huang, XT
- Ji, XB
- Jiang, CH
- Jiang, XS
- Jin, DP
- Jin, S
- Jin, Y
- Jin, Y
- Lai, YF
- Li, F
- Li, G
- Li, HH
- Li, J
- Li, JC
- Li, QJ
- Li, RY
- Li, WD
- Li, WG
- Li, XL
- Li, XQ
- Li, YL
- Liang, YF
- Liao,
DOIAbstract
The absolute branching fraction for the decay D+ -> mu(+)nu has been directly measured based on a data sample of about 33 pb(-1) collected around root 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+ -> mu+nu(mu) are observed. Those yield the branching fraction of BF(D+ -> mu+nu(mu)) = (0.122(-0.053)(+0.111) +/- 0.010)%, and a corresponding value of the pseudoscalar decay constant f(D+) = (371(-119)(+129) +/- 25) MeV. (c) 2005 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersi...
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