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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.

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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