Search for the Decays D+→φe+ν,D+→φKπ+e+ν,D0→φKe+νand D0→φKμ+ν

  • We report the results of a search for the semileptonic decays D+→e+ν,D+→Kπ+e+ν,D0→Ke+ν and D0→Kμ+ν using the BES detector at the BEPC e+e Collider. Using a data sample of 22.3pb-1 collected at the center of mass energy s=4.03GeV, we select 2472±87D 0 tag DX and 7628±149D 0 tag DX singly tagged D events, where the X could be γ, π 0 and/or π±. Based on the method of "combined D+and D0 single and double tags", we determine that 2471±218 D+X and 7629±251 D0 X are contained in the recoil side of the singly tagged neutral and charged D mesons, respectively. No events for the 4 semileptonic decay modes are observed in the recoil side of the tagged D mesons. The 90% confidence level upper limits of B(D+→e+ν)<1.38%,B(D+→Kπ+e+ν)<2.01%,B(D0→Ke+ν)<0.53% and B(D0→Kμ+ν)<0.53% are determined from the search for the semileptonic decays of D+ and D0.
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  • [1]  Abreu P et al.DELPHI Collab.,Zeit.Phys.1994,C61:1;OPAL Collab.,A .Akersetal.An Investigation of BS Oscillation Using BS Enhanced Samples.Contributed paper to International Europhysics Conference on High Energy Physics EPS 0276,Brus sels,July1995, 2 BAI J Z et al.N .I.M .1994,A344:319—334;DING HuiLiang et al.HEPNP ,1992,16(9):669(in Chinese) (丁慧良等.高能物理与核物理,1992,16(9):669) 3 RONG Gang et al.HEPNP ,2002,26(3):207(in Chinese) (荣刚等.高能物理与核物理,2002,26(3):207)4 Particle Data Group,Bartels J et al.Eur.Phys.J.,2000,C15:5445 BAI Z et al(MARK Ⅲ Collaboration).PRL ,1991,66:1011
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Get Citation
BES Collaboration. Search for the Decays D+→φe+ν,D+→φKπ+e+ν,D0→φKe+νand D0→φKμ+ν[J]. Chinese Physics C, 2002, 26(11): 1093-1102.
BES Collaboration. Search for the Decays D+→φe+ν,D+→φKπ+e+ν,D0→φKe+νand D0→φKμ+ν[J]. Chinese Physics C, 2002, 26(11): 1093-1102. shu
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Received: 2002-02-22
Revised: 1900-01-01
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Search for the Decays D+→φe+ν,D+→φKπ+e+ν,D0→φKe+νand D0→φKμ+ν

  • Institute of High Energy Physics, CAS, Beijing 100039, China

Abstract: We report the results of a search for the semileptonic decays D+→e+ν,D+→Kπ+e+ν,D0→Ke+ν and D0→Kμ+ν using the BES detector at the BEPC e+e Collider. Using a data sample of 22.3pb-1 collected at the center of mass energy s=4.03GeV, we select 2472±87D 0 tag DX and 7628±149D 0 tag DX singly tagged D events, where the X could be γ, π 0 and/or π±. Based on the method of "combined D+and D0 single and double tags", we determine that 2471±218 D+X and 7629±251 D0 X are contained in the recoil side of the singly tagged neutral and charged D mesons, respectively. No events for the 4 semileptonic decay modes are observed in the recoil side of the tagged D mesons. The 90% confidence level upper limits of B(D+→e+ν)<1.38%,B(D+→Kπ+e+ν)<2.01%,B(D0→Ke+ν)<0.53% and B(D0→Kμ+ν)<0.53% are determined from the search for the semileptonic decays of D+ and D0.

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