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Direct measurement of [formula presented] and [formula presented]

  • Author(s): Bai, JZ;
  • Ban, Y;
  • Bian, JG;
  • Blum, I;
  • Chen, GP;
  • Chen, HF;
  • Chen, J;
  • Chen, JC;
  • Chen, Y;
  • Chen, YB;
  • Chen, YQ;
  • Cheng, BS;
  • Cui, XZ;
  • Ding, HL;
  • Dong, LY;
  • Du, ZZ;
  • Dunwoodie, W;
  • Gao, CS;
  • Gao, ML;
  • Gao, SQ;
  • Gratton, P;
  • Gu, JH;
  • Gu, SD;
  • Gu, WX;
  • Gu, YF;
  • Guo, YN;
  • Guo, ZJ;
  • Han, SW;
  • Han, Y;
  • Harris, FA;
  • He, J;
  • He, JT;
  • He, KL;
  • He, M;
  • Heng, YK;
  • Hitlin, DG;
  • Hu, GY;
  • Hu, HM;
  • Hu, JL;
  • Hu, QH;
  • Hu, T;
  • Hu, XQ;
  • Huang, YZ;
  • Huang, GS;
  • Izen, JM;
  • Jiang, CH;
  • Jin, Y;
  • Jones, BD;
  • Ju, X;
  • Ke, ZJ;
  • Kelsey, MH;
  • Kim, BK;
  • Kong, D;
  • Lai, YF;
  • Lang, PF;
  • Lankford, A;
  • Li, CG;
  • Li, D;
  • Li, HB;
  • Li, J;
  • Li, JC;
  • Li, PQ;
  • Li, RB;
  • Li, W;
  • Li, WG;
  • Li, XH;
  • Li, XN;
  • Liu, HM;
  • Liu, J;
  • Liu, RG;
  • Liu, Y;
  • Lou, XC;
  • Lowery, B;
  • Lu, F;
  • Lu, JG;
  • Luo, XL;
  • Ma, EC;
  • Ma, JM;
  • Malchow, R;
  • Mandelkern, M;
  • Mao, HS;
  • Mao, ZP;
  • Meng, XC;
  • Nie, J;
  • Olsen, SL;
  • Oyang, J;
  • Paluselli, D;
  • Pan, LJ;
  • Panetta, J;
  • Porter, F;
  • Qi, ND;
  • Qi, XR;
  • Qian, CD;
  • Qiu, JF;
  • Qu, YH;
  • Que, YK;
  • Rong, G;
  • Schernau, M;
  • Schmid, B;
  • Schultz, J
  • et al.
Abstract

The first measurement of (Formula presented) and an upper limit for (Formula presented) are determined from 22.3 (Formula presented) of (Formula presented) annihilation data at a c.m. energy of 4.03 GeV. The data were recorded by the Beijing Spectrometer (BES) at BEPC. A recoil charge method is applied to charm threshold data to determine the charge of the D meson in the recoil from (Formula presented) reconstructed (Formula presented) (Formula presented) mesons. The branching fractions (Formula presented) and (Formula presented) are determined from 10 events with a reconstructed D and a recoiling (Formula presented) In addition, a 90% C.L. upper limit of (Formula presented) is determined from a search for semileptonic decays of the (Formula presented) © 2000 The American Physical Society.

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