Direct measurement of the pseudoscalar decay constant fD+
- Ablikim, M.
- Bai, J.Z.
- Ban, Y.
- Bian, J.G.
- Cai, X.
- Chang, J.F.
- Chen, H.F.
- Chen, H.S.
- Chen, H.X.
- Chen, J.C.
- Chen, Jin
- Chen, Jun
- Chen, M.L.
- Chen, Y.B.
- Chi, S.P.
- Chu, Y.P.
- Cui, X.Z.
- Dai, H.L.
- Dai, Y.S.
- Deng, Z.Y.
- Dong, L.Y.
- Dong, Q.F.
- Du, S.X.
- Du, Z.Z.
- Fang, J.
- Fang, S.S.
- Fu, C.D.
- Fu, H.Y.
- Gao, C.S.
- Gao, Y.N.
- Gong, M.Y.
- Gong, W.X.
- Gu, S.D.
- Guo, Y.N.
- Guo, Y.Q.
- He, K.L.
- He, M.
- He, X.
- Heng, Y.K.
- Hu, H.M.
- Hu, T.
- Huang, X.P.
- Huang, X.T.
- Ji, X.B.
- Jiang, C.H.
- Jiang, X.S.
- Jin, D.P.
- Jin, S.
- Jin, Y.
- Jin, Yi
- Lai, Y.F.
- Li, F.
- Li, G.
- Li, H.H.
- Li, J.
- Li, J.C.
- Li, Q.J.
- Li, R.Y.
- Li, S.M.
- Li, W.D.
- Li, W.G.
- Li, X.L.
- Li, X.Q.
- Li, Y.L.
- Liang, Y.F.
- Liao, H.B.
- Liu, C.X.
- Liu, F.
- Liu, Fang
- Liu, H.H.
- Liu, H.M.
- Liu, J.
- Liu, J.B.
- Liu, J.P.
- Liu, R.G.
- Liu, Z.A.
- Liu, Z.X.
- Lu, F.
- Lu, G.R.
- Lu, H.J.
- Lu, J.G.
- Luo, C.L.
- Luo, L.X.
- Luo, X.L.
- Ma, F.C.
- Ma, H.L.
- Ma, J.M.
- Ma, L.L.
- Ma, Q.M.
- Ma, X.B.
- Ma, X.Y.
- Mao, Z.P.
- Mo, X.H.
- Nie, J.
- Nie, Z.D.
- Peng, H.P.
- Qi, N.D.
- Qian, C.D.
- Qin, H.
- Qiu, J.F.
- Ren, Z.Y.
- Rong, G.
- Shan, L.Y.
- Shang, L.
- Shen, D.L.
- Shen, X.Y.
- Sheng, H.Y.
- Shi, F.
- Shi, X.
- Sun, H.S.
- Sun, J.F.
- Sun, S.S.
- Sun, Y.Z.
- Sun, Z.J.
- Tang, X.
- Tao, N.
- Tian, Y.R.
- Tong, G.L.
- Wang, D.Y.
- Wang, J.Z.
- Wang, K.
- Wang, L.
- Wang, L.S.
- Wang, M.
- Wang, P.
- Wang, P.L.
- Wang, S.Z.
- Wang, W.F.
- Wang, Y.F.
- Wang, Z.
- Wang, Z.Y.
- Wang, Zhe
- Wang, Zheng
- Wei, C.L.
- Wei, D.H.
- Wu, N.
- Wu, Y.M.
- Xia, X.M.
- Xie, X.X.
- Xin, B.
- Xu, G.F.
- Xu, H.
- Xue, S.T.
- Yan, M.L.
- Yang, F.
- Yang, H.X.
- Yang, J.
- Yang, Y.X.
- Ye, M.
- Ye, M.H.
- Ye, Y.X.
- Yi, L.H.
- Yi, Z.Y.
- Yu, C.S.
- Yu, G.W.
- Yuan, C.Z.
- Yuan, J.M.
- Yuan, Y.
- Zang, S.L.
- Zeng, Y.
- Zeng, Yu
- Zhang, B.X.
- Zhang, B.Y.
- Zhang, C.C.
- Zhang, D.H.
- Zhang, H.Y.
- Zhang, J.
- Zhang, J.W.
- Zhang, J.Y.
- Zhang, Q.J.
- Zhang, S.Q.
- Zhang, X.M.
- Zhang, X.Y.
- Zhang, Y.Y.
- Zhang, Yiyun
- Zhang, Z.P.
- Zhang, Z.Q.
- Zhao, D.X.
- Zhao, J.B.
- Zhao, J.W.
- Zhao, M.G.
- Zhao, P.P.
- Zhao, W.R.
- Zhao, X.J.
- Zhao, Y.B.
- Zheng, H.Q.
- Zheng, J.P.
- Zheng, L.S.
- Zheng, Z.P.
- Zhong, X.C.
- Zhou, B.Q.
- Zhou, G.M.
- Zhou, L.
- Zhou, N.F.
- Zhu, K.J.
- Zhu, Q.M.
- Zhu, Y.C.
- Zhu, Y.S.
- Zhu, Yingchun
- Zhu, Z.A.
- Zhuang, B.A.
- Zhuang, X.A.
- Zou, B.S.
DOIAbstract
AbstractThe 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 s=3.773 GeV 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 BF(D+→μ+νμ)=(0.122−0.053+0.111±0.010)%, and a corresponding value of the pseudoscalar decay constant fD+=(371−119+129±25) MeV
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