Search for the Decays D+→φe+ν,D+→φK－π+e+ν,D0→φK－e+νand D0→φK－μ+ν

BES Collaboration

Chinese Physics C> 2002, Vol. 26> Issue(11) : 1093-1102

Search for the Decays D⁺→φe⁺ν,D⁺→φK^－π⁺e⁺ν,D⁰→φK^－e⁺νand D⁰→φK^－μ⁺ν

BES Collaboration

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

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Abstract：
We report the results of a search for the semileptonic decays D⁺→e⁺ν,D⁺→K^－π⁺e⁺ν,D⁰→K^－e⁺ν and D⁰→K^－μ⁺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⁺→K^－π⁺e⁺ν)<2.01%,B(D⁰→K^－e⁺ν)<0.53% and B(D⁰→K^－μ⁺ν)<0.53% are determined from the search for the semileptonic decays of D⁺ and D⁰.

References

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BES Collaboration. Search for the Decays D⁺→φe⁺ν,D⁺→φK^－π⁺e⁺ν,D⁰→φK^－e⁺νand D⁰→φK^－μ⁺ν[J]. Chinese Physics C, 2002, 26(11): 1093-1102.

BES Collaboration. Search for the Decays D⁺→φe⁺ν,D⁺→φK^－π⁺e⁺ν,D⁰→φK^－e⁺νand D⁰→φK^－μ⁺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

Search for the Decays D⁺→φe⁺ν,D⁺→φK^－π⁺e⁺ν,D⁰→φK^－e⁺νand D⁰→φK^－μ⁺ν

BES Collaboration

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

Received Date: 2002-02-22
Accepted Date: 1900-01-01
Available Online: 2002-11-05

Abstract: We report the results of a search for the semileptonic decays D⁺→e⁺ν,D⁺→K^－π⁺e⁺ν,D⁰→K^－e⁺ν and D⁰→K^－μ⁺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⁺→K^－π⁺e⁺ν)<2.01%,B(D⁰→K^－e⁺ν)<0.53% and B(D⁰→K^－μ⁺ν)<0.53% are determined from the search for the semileptonic decays of D⁺ and D⁰.