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Evidence for the leptonic decay D → μνμ

  • 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, XZ;
  • Ding, HL;
  • Du, ZZ;
  • Dunwoodie, W;
  • Fan, XL;
  • Fang, J;
  • Fero, M;
  • Gao, CS;
  • Gao, ML;
  • Gao, SQ;
  • Gratton, P;
  • Gu, JH;
  • Gu, SD;
  • Gu, WX;
  • Gu, YF;
  • Guo, YN;
  • Han, SW;
  • Han, Y;
  • Harris, FA;
  • Hatanaka, M;
  • He, J;
  • He, M;
  • Hitlin, DG;
  • Hu, GY;
  • Hu, T;
  • Hu, XQ;
  • Huang, DQ;
  • Huang, YZ;
  • Izen, JM;
  • Jia, QP;
  • Jiang, CH;
  • Jin, S;
  • Jin, Y;
  • Jones, L;
  • Kang, SH;
  • Ke, ZJ;
  • Kelsey, MH;
  • Kim, BK;
  • Kong, D;
  • 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, XH;
  • Li, XN;
  • Lin, SZ;
  • Liu, HM;
  • Liu, JH;
  • Liu, Q;
  • Liu, RG;
  • Liu, Y;
  • Liu, ZA;
  • Lou, XC;
  • Lowery, B;
  • Lu, JG;
  • Luo, S;
  • Luo, Y;
  • Ma, AM;
  • Ma, EC;
  • Ma, JM;
  • 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
  • et al.
Abstract

Purely leptonic decays of the charged D meson have been studied using the reaction e+e- → D*+D- at a center of mass energy of 4.03 GeV. A search was performed for D → μνμ recoiling against a D0 or D+ which had been reconstructed from its hadronic decay products. A single event candidate was found in the reaction e+e- → D*+D-, where D*+ → π+D0 with the D0 → K-π+, and the recoiling D- decaying via D- → μ-ν̄μ. This yields a branching fraction value B(D → μνμ) = 0.08+0.16+0.05-0.05-0.02%, and a corresponding value of the pseudoscalar decay constant fD = 300+180+80-150-40 MeV. © 1998 Elsevier Science B.V. All rights reserved.

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