Direct Measurement of the Pseudoscalar Decay Constant Fd+

M Ablikim,JZ Bai, Y Ban, JG Bian, X Cai, JF Chang,HF Chen,HS Chen,HX Chen,JC Chen,J Chen, ML Chen,YB Chen, SP Chi, YP Chu,XZ Cui, HL Dai, YS Dai, ZY Deng, LY Dong, QF Dong, SX Du,ZZ Du,J Fang, SS Fang, CD Fu, H Fu,CS Gao, YN Gao, MY Gong, WX Gong,SD Gu,YN Guo,YQ Guo,KL He,M He, X He, YK Heng,HM Hu,T Hu, XP Huang, XT Huang, XB Ji,CH Jiang, XS Jiang, DP Jin, S Jin,Y Jin,YF Lai,F Li, G Li, HH Li,J Li,JC Li,QJ Li,RY Li,WD Li, WG Li,XL Li,XQ Li, YL Li, YF Liang, HB Liao, C Liu, F Liu,HH Liu,HM Liu, J Liu, JB Liu, JP Liu,RG Liu,ZA Liu,ZX Liu, F Lu, GR Lu, HJ Lu,JG Lu, CL Luo, LX Luo, XL Luo, FC Ma, HL Ma,JM Ma, LL Ma, QM Ma, XB Ma, XY Ma,ZP Mao, XH Mo,J Nie, ZD Nie, HP Peng,ND Qi, CD Qian, H Qin, JF Qiu, Z Ren,G Rong, LY Shan, L Shang,DL Shen,XY Shen,HY Sheng, F Shi,X Shi,HS Sun, JF Sun,SS Sun, YZ Sun, ZJ Sun, X Tang, N Tao, YR Tian,GL Tong, DY Wang, JZ Wang, K Wang,L Wang,LS Wang,M Wang, P Wang, PL Wang, SZ Wang,WF Wang,YF Wang, Z Wang, ZY Wang, CL Wei, DH Wei, N Wu, YM Wu,XM Xia, XX Xie, B Xin, GF Xu, H Xu,ST Xue, ML Yan, F Yang, HX Yang, J Yang, YX Yang,M Ye,MH Ye, Y Ye, LH Yi, ZY Yi,CS Yu, GW Yu,CZ Yuan, JM Yuan, Y Yuan, SL Zang, Y Zeng,BX Zhang,BY Zhang,CC Zhang,DH Zhang,HY Zhang, J Zhang, JW Zhang, JY Zhang, QJ Zhang,SQ Zhang, XM Zhang, XY Zhang,YY Zhang, ZP Zhang, ZQ Zhang,DX Zhao,JB Zhao,JW Zhao,MG Zhao,PP Zhao,WR Zhao, XJ Zhao, YB Zhao, HQ Zheng,JP Zheng,LS Zheng,ZP Zheng, XC Zhong, BQ Zhou,GM Zhou,L Zhou, NF Zhou, KJ Zhu,QM Zhu,Y Zhu,YC Zhu, ZA Zhu,BA Zhuang, XA Zhuang, BS Zou

Physics letters B（2005）

引用 101|浏览25

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摘要

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 s=3.773GeV 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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