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Direct measurement of the pseudoscalar decay constant, fDs.

  • Author(s): Bai, JZ
  • Bardon, O
  • Blum, I
  • Breakstone, A
  • Burnett, T
  • Chen, GP
  • Chen, HF
  • Chen, J
  • Chen, SJ
  • Chen, SM
  • Chen, Y
  • Chen, YB
  • Chen, YQ
  • Cheng, BS
  • Cowan, RF
  • Cui, HC
  • Cui, XZ
  • Ding, HL
  • Du, ZZ
  • Dunwoodie, W
  • Fan, XL
  • Fang, J
  • Fero, M
  • Gao, CS
  • Gao, ML
  • Gao, SQ
  • Gao, WX
  • Gratton, P
  • Gu, JH
  • Gu, SD
  • Gu, WX
  • Gu, YF
  • Guo, YN
  • Han, SW
  • Han, Y
  • Harris, FA
  • Hatanaka, M
  • He, J
  • He, KR
  • He, M
  • Hitlin, DG
  • Hu, GY
  • Hu, HB
  • Hu, T
  • Hu, XQ
  • Huang, DQ
  • Huang, YZ
  • Izen, JM
  • Jia, QP
  • Jiang, CH
  • Jin, Y
  • Jones, L
  • Kang, SH
  • Kelsey, MH
  • Kim, BK
  • Lai, YF
  • Lan, HB
  • Lang, PF
  • Lankford, A
  • Li, F
  • Li, J
  • Li, PQ
  • Li, Q
  • Li, RB
  • et al.
Abstract

The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the Ds meson in the reaction e+e-→Ds+Ds- at a c.m. energy of 4.03 GeV. Three events are observed in which one Ds decays hadronically to φπ, K̄*0K, or K̄0K, and the other decays leptonically to μνμ or τντ. With the assumption of μ-τ universality, values of the branching fraction, B(Ds→μνμ)=(1.5-0.6-0.2+1.3+0.3)%, and the Ds pseudoscalar decay constant, fDs=(4.3-1.3-0.4+1.5+0.4)×102 MeV, are obtained. © 1995 The American Physical Society.

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