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Direct measurement of the pseudoscalar decay constant |
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| Institution: | aInstitute of High Energy Physics, Beijing 100049, People's Republic of China bChina Center for Advanced Science and Technology, Beijing 100080, People's Republic of China cGuangxi Normal University, Guilin 541004, People's Republic of China dGuangxi University, Nanning 530004, People's Republic of China eHenan Normal University, Xinxiang 453002, People's Republic of China fHuazhong Normal University, Wuhan 430079, People's Republic of China gHunan University, Changsha 410082, People's Republic of China hLiaoning University, Shenyang 110036, People's Republic of China iNanjing Normal University, Nanjing 210097, People's Republic of China jNankai University, Tianjin 300071, People's Republic of China kPeking University, Beijing 100871, People's Republic of China lShandong University, Jinan 250100, People's Republic of China mShanghai Jiaotong University, Shanghai 200030, People's Republic of China nSichuan University, Chengdu 610064, People's Republic of China oTsinghua University, Beijing 100084, People's Republic of China pUniversity of Science and Technology of China, Hefei 230026, People's Republic of China qWuhan University, Wuhan 430072, People's Republic of China rZhejiang University, Hangzhou 310028, People's Republic of China |
| Abstract: | The absolute branching fraction for the decay D+→μ+ν has been directly measured based on a data sample of about 33 pb−1 collected around with the BES-II detector at the BEPC collider. A total of 5321±149±160 D− mesons are reconstructed in nine hadronic decay modes. In the system recoiling against these singly tagged D− mesons, 2.67±1.74 purely leptonic decay events of D+→μ+νμ are observed. Those yield the branching fraction of , and a corresponding value of the pseudoscalar decay constant . |
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