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Direct Measurement of the Pseudoscalar Decay Constant, fDs
- 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;
- Li, W;
- Li, WD;
- Li, WG;
- Li, X;
- Li, XN;
- Lin, SZ;
- Liu, HM;
- Liu, JH;
- Liu, Q;
- Liu, RG;
- Liu, Y;
- Liu, ZA;
- Lou, XC;
- Lowery, B;
- Lu, JG;
- M., A;
- C., E;
- M., J;
- Mao, HS;
- Mao, ZP;
- Malchow, R;
- Mandelkern, M;
- Meng, XC;
- Ni, HL;
- Nie, J;
- Olsen, SL;
- Oyang, J;
- Paluselli, D;
- Pan, LJ;
- Panetta, J;
- Porter, F;
- Prabhakar, E;
- Qi, ND;
- Que, YK;
- Quigley, J;
- Rong, G;
- Schernau, M;
- Schmid, B;
- Schultz, J;
- Shao, YY;
- Shen, DL;
- Shen, H;
- Shen, XY;
- Sheng, HY;
- Shi, HZ;
- Shi, XR;
- Smith, A;
- Soderstrom, E;
- Song, XF;
- Standifird, J;
- Stoker, D;
- Sun, F;
- Sun, HS;
- Sun, SJ;
- Synodinos, J;
- Tan, YP;
- Tang, SQ;
- Toki, W;
- Tong, GL;
- Torrence, E;
- Wang, F;
- Wang, LS;
- Wang, LZ;
- Wang, M;
- Wang, P;
- Wang, PL;
- Wang, SM;
- Wang, TJ;
- Wang, W;
- Wang, YY;
- Whittaker, S;
- Wilson, R;
- Wisniewski, WJ;
- Xi, DM;
- Xia, XM;
- Xie, PP;
- Xu, DZ;
- Xu, RS;
- Xu, ZQ;
- Xue, ST;
- Yamamoto, R;
- Yan, J;
- Yan, WG;
- Yang, CM;
- Yang, CY;
- Yang, W;
- Yao, HB;
- Ye, MH;
- Ye, SZ;
- Yu, CS;
- Yu, CX;
- Yu, ZQ;
- Yuan, CZ;
- Zhang, BY;
- Zhang, CC;
- Zhang, DH;
- Zhang, HL;
- Zhang, J;
- Zhang, JW;
- Zhang, LS;
- Zhang, SQ;
- Zhang, Y;
- Zhang, YY;
- Zhao, DX;
- Zhao, JW;
- Zhao, M;
- Zhao, PD;
- Zhao, WR;
- Zhao, WX;
- Zheng, JP;
- Zheng, LS;
- Zheng, ZP;
- Zhou, GP;
- Zhou, HS;
- Zhou, Li;
- Zhou, XF;
- Zhou, YH;
- Zhu, QM;
- Zhu, YC;
- Zhu, YS;
- Zhuang, BA;
- Zioulas, G
- 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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