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,D ⁰→K ^－e ⁺ν and D ⁰→K ^－μ ⁺ν using the BES detector at the BEPC e ⁺e ^－Collider. Using a data sample of 22.3pb ^－1collected 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 D ⁰single and double tags", we determine that 2471±218 D ⁺X and 7629±251 D ⁰X 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(D ⁰→K ^－e ⁺ν)<0.53% and B(D ⁰→K ^－μ ⁺ν)<0.53% are determined from the search for the semileptonic decays of D ⁺and D ⁰.

References

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BES Collaboration. Search for the Decays D ⁺→φe ⁺ν,D ⁺→φK ^－π ⁺e ⁺ν,D ⁰→φK ^－e ⁺νand D ⁰→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,D ⁰→φK ^－e ⁺νand D ⁰→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^－1collected 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 D⁰single and double tags", we determine that 2471±218 D⁺X and 7629±251 D⁰X 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.