/ hep-ex arXiv:1611.04382


Measurement of the Absolute Branching Fraction for $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$


Ablikim, Medina (Beijing, Inst. High Energy Phys.) ; Achasov, Mikhail N (Novosibirsk, IYF) ; Ahmed, Samer Ali Nasher (Helmholtz Inst., Mainz) ; Ai, Xiaocong (Beijing, Inst. High Energy Phys.) ; Albayrak, Onur (Carnegie Mellon U.) ; Albrecht, Malte (Ruhr U., Bochum) ; Ambrose, Daniel (Rochester U.) ; Amoroso, Antonio (INFN, Turin) ; An, Fenfen (Beijing, Inst. High Energy Phys.) ; An, Qi (Hefei, CUST) ; Bai, Jingzhi (Beijing, Inst. High Energy Phys.) ; Bakina, Olga (Dubna, JINR) ; Baldini Ferroli, Rinaldo (Frascati) ; Ban, Yong (Peking U., Beijing) ; Bennett, Dan (Indiana U.) ; Bennett, Jake (Carnegie Mellon U.) ; Berger, Niklaus (Mainz U.) ; Bertani, Monica (Frascati) ; Bettoni, Diego (INFN, Ferrara) ; Bian, Jianming (Minnesota U.) ; Bianchi, Fabrizio (INFN, Turin) ; Boger, Evgeny (Dubna, JINR) ; Boyko, Igor (Dubna, JINR) ; Briere, Roy (Carnegie Mellon U.) ; Cai, Hao (Wuhan U.) ; Cai, Xiao (Beijing, Inst. High Energy Phys.) ; Cakir, Orhan (Ankara U.) ; Calcaterra, Alessandro (Frascati) ; Cao, Guofu (Beijing, Inst. High Energy Phys.) ; Cetin, Serkant Ali (Istanbul Bilgi U.) ; Chai, Junying (INFN, Turin) ; Chang, Jinfan (Beijing, Inst. High Energy Phys.) ; Chelkov, Georgy (Dubna, JINR) ; Chen, Gang (Beijing, Inst. High Energy Phys.) ; Chen, Hesheng (Beijing, Inst. High Energy Phys.) ; Chen, Jiangchuan (Beijing, Inst. High Energy Phys.) ; Chen, Mary (Beijing, Inst. High Energy Phys.) ; Chen, Shi (Beijing, GUCAS) ; Chen, Shenjian (Nanjing U.) ; Chen, Xuan (Beijing, Inst. High Energy Phys.) ; Chen, Xurong (Lanzhou U.) ; Chen, Yuanbo (Beijing, Inst. High Energy Phys.) ; Chu, xinkun (Peking U., Beijing) ; Cibinetto, Gianluigi (INFN, Ferrara) ; Dai, Hongliang (Beijing, Inst. High Energy Phys.) ; Dai, JianPing (Shanghai Jiaotong U.) ; Dbeyssi, Alaa (Helmholtz Inst., Mainz) ; Dedovich, Dmitry (Dubna, JINR) ; Deng, Ziyan (Beijing, Inst. High Energy Phys.) ; Denig, Achim (Mainz U.) ; Denysenko, Igor (Dubna, JINR) ; Destefanis, Marco (INFN, Turin) ; De Mori, Francesca (INFN, Turin) ; Ding, Yong (Liaoning U.) ; Dong, Chao (Nankai U.) ; Dong, Jing (Beijing, Inst. High Energy Phys.) ; Dong, Liaoyuan (Beijing, Inst. High Energy Phys.) ; Dong, Mingyi (Beijing, Inst. High Energy Phys.) ; Dorjkhaidav, Orlokh ; Dou, Zhenglei (Nanjing U.) ; Du, Shuxian (Zhengzhou U.) ; Duan, Pengfei (Beijing, Inst. High Energy Phys.) ; Fan, Jingzhou (Tsinghua U., Beijing) ; Fang, Jian (Beijing, Inst. High Energy Phys.) ; Fang, Shuangshi (Beijing, Inst. High Energy Phys.) ; Fang, Xin (Hefei, CUST) ; Fang, Yi (Beijing, Inst. High Energy Phys.) ; Farinelli, Riccardo (Ferrara U.) ; Fava, Luciano (INFN, Turin) ; Fegan, Stuart (Mainz U.) ; Feldbauer, Florian (Mainz U.) ; Felici, Giulietto (Frascati) ; Feng, Changqing (Hefei, CUST) ; Fioravanti, Elisa (INFN, Ferrara) ; Fritsch, Miriam (Helmholtz Inst., Mainz) ; Fu, Chengdong (Beijing, Inst. High Energy Phys.) ; Gao, Qing (Beijing, Inst. High Energy Phys.) ; Gao, Xinlei (Hefei, CUST) ; Gao, Yuanning (Tsinghua U., Beijing) ; Gao, Zhen (Hefei, CUST) ; Garzia, Isabella (INFN, Ferrara) ; Goetzen, Klaus (Darmstadt, GSI) ; Gong, Li GONG (Nankai U.) ; Gong, Wenxuan (Beijing, Inst. High Energy Phys.) ; Gradl, Wolfgang (Mainz U.) ; Greco, Michela (INFN, Turin) ; Gu, Minhao (Beijing, Inst. High Energy Phys.) ; Gu, Yunting (Guangxi U.) ; Guo, Aiqiang (Beijing, Inst. High Energy Phys.) ; Guo, Libo (Nanjing Normal U.) ; Guo, Rupan (Beijing, Inst. High Energy Phys.) ; Guo, Yue (Beijing, Inst. High Energy Phys.) ; Guo, Yuping (Mainz U.) ; Haddadi, Zahra (Groningen, KVI) ; Hafner, Andreas (Mainz U.) ; Han, Shuang (Wuhan U.) ; Hao, Xiqing (Henan Normal U.) ; Harris, Frederick A (Hawaii U.) ; He, Kanglin (Beijing, Inst. High Energy Phys.) ; He, Xiqin (USTL, Anshan) ; Heinsius, Fritz-Herbert (Ruhr U., Bochum) ; Held, Thomas (Ruhr U., Bochum) ; Heng, Yuekun (Beijing, Inst. High Energy Phys.) ; Holtmann, Tobias (Ruhr U., Bochum) ; Hou, Zhilong (Beijing, Inst. High Energy Phys.) ; Hu, Chen (Nanjing Normal U.) ; Hu, Haiming (Beijing, Inst. High Energy Phys.) ; Hu, Tao (Beijing, Inst. High Energy Phys.) ; Hu, Yu (Beijing, Inst. High Energy Phys.) ; Huang, Guangshun (Hefei, CUST) ; Huang, Jinshu (Henan Normal U.) ; Huang, Xingtao (Shandong U.) ; Huang, Xiaozhong (Nanjing U.) ; Huang, Zhiling (Liaoning U.) ; Hussain, Talab (Punjab U.) ; Ikegami Andersson, Walter (Uppsala U.) ; Ji, Quan (Beijing, Inst. High Energy Phys.) ; Ji, Qingping (Henan Normal U.) ; Ji, Xiaobin (Beijing, Inst. High Energy Phys.) ; Ji, Xiaolu (Beijing, Inst. High Energy Phys.) ; Jiang, Luwen (Wuhan U.) ; Jiang, Xiaoshan (Beijing, Inst. High Energy Phys.) ; Jiang, Xingyu (Nankai U.) ; Jiao, Jianbin (Shandong U.) ; Jiao, Zheng (Huangshan U.) ; Jin, Dapeng (Beijing, Inst. High Energy Phys.) ; Jin, Shan (Beijing, Inst. 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High Energy Phys.) ; Liu, Feng (CCNU, Wuhan, Inst. Part. Phys.) ; Liu, Hongbang (Guangxi U.) ; Liu, Huihui (Henan U. Sci. Technol.) ; Liu, Huanhuan (Beijing, Inst. High Energy Phys.) ; Liu, Huaimin (Beijing, Inst. High Energy Phys.) ; Liu, Jie (Beijing, Inst. High Energy Phys.) ; Liu, Jianbei (Hefei, CUST) ; Liu, Jueping (Wuhan U.) ; Liu, Jingyi (Beijing, Inst. High Energy Phys.) ; Liu, Kai (Tsinghua U., Beijing) ; Liu, Kuiyong (Liaoning U.) ; Liu, Landiao (Peking U., Beijing) ; Liu, Peilian (Beijing, Inst. High Energy Phys.) ; Liu, Qian (Beijing, GUCAS) ; Liu, Shubin (Hefei, CUST) ; Liu, Xiang (Lanzhou U.) ; Liu, Yu-Bin (Nankai U.) ; Liu, Yuanyuan (Nankai U.) ; Liu, Zhenan (Beijing, Inst. High Energy Phys.) ; Liu, Zhiqing (Mainz U.) ; Loehner, Herbert (Groningen, KVI) ; Long, Yunfei (Peking U., Beijing) ; Lou, Xinchou (Beijing, Inst. High Energy Phys.) ; Lu, Hai-jiang (Huangshan U.) ; Lu, Junguang (Beijing, Inst. High Energy Phys.) ; Lu, Yu (Beijing, Inst. 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High Energy Phys.) ; Mitchell, Ryan (Indiana U.) ; Mo, Xiaohu (Beijing, Inst. High Energy Phys.) ; Mo, Yujin (CCNU, Wuhan, Inst. Part. Phys.) ; Morales Morales, Cristina (Helmholtz Inst., Mainz) ; Morello, Gianfranco (Frascati) ; Muchnoi, Nikolai Yu (Novosibirsk, IYF) ; Muramatsu, Hajime (Minnesota U.) ; Musiol, Patrick (Ruhr U., Bochum) ; Nefedov, Yury (Dubna, JINR) ; Nerling, Frank (Darmstadt, GSI) ; Nikolaev, Ivan (Novosibirsk, IYF) ; Ning, Zhe (Beijing, Inst. High Energy Phys.) ; Nisar, Shabana (COMSATS, Lahore) ; Niu, Shunli (Beijing, Inst. High Energy Phys.) ; Niu, Xunyi (Beijing, Inst. High Energy Phys.) ; Olsen, Stephen L (Seoul Natl. U.) ; Ouyang, Qun OuYang (Beijing, Inst. High Energy Phys.) ; Pacetti, Simone (Perugia U.) ; Pan, Yue (Hefei, CUST) ; Patteri, Piero (Frascati) ; Pelizaeus, Marc (Ruhr U., Bochum) ; Peng, Haiping (Hefei, CUST) ; Peters, Klaus (Darmstadt, GSI) ; Pettersson, Joachim (Uppsala U.) ; Ping, Jialun (Nanjing Normal U.) ; Ping, Ronggang (Beijing, Inst. 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High Energy Phys.) ; Zhao, Qingwang (Beijing, Inst. High Energy Phys.) ; Zhao, Shujun (Zhengzhou U.) ; Zhao, Tianchi (Beijing, Inst. High Energy Phys.) ; Zhao, Yubin (Beijing, Inst. High Energy Phys.) ; Zhao, Zhengguo (Hefei, CUST) ; Zhemchugov, Alexey (Dubna, JINR) ; Zheng, Bo (U. South China, Hengyang) ; Zheng, Jianping (Beijing, Inst. High Energy Phys.) ; Zheng, Wenjing (Shandong U.) ; Zheng, Yangheng (Beijing, GUCAS) ; Zhong, Bin (Nanjing Normal U.) ; Zhou, Li (Beijing, Inst. High Energy Phys.) ; Zhou, Xiang (Wuhan U.) ; Zhou, Xiaokang (Hefei, CUST) ; Zhou, Xiaorong (Hefei, CUST) ; Zhou, Xingyu (Beijing, Inst. High Energy Phys.) ; Zhu, Kai (Beijing, Inst. High Energy Phys.) ; Zhu, Kejun (Beijing, Inst. High Energy Phys.) ; Zhu, Shuai (Beijing, Inst. High Energy Phys.) ; Zhu, Shihai (USTL, Anshan) ; Zhu, Xianglei (Tsinghua U., Beijing) ; Zhu, yingchun (Hefei, CUST) ; Zhu, Yongsheng (Beijing, Inst. High Energy Phys.) ; Zhu, Zi-An (Beijing, Inst. High Energy Phys.) ; Zhuang, Jian (Beijing, Inst. High Energy Phys.) ; Zotti, Laura (INFN, Turin) ; Zou, Bingsong (Beijing, Inst. High Energy Phys.) ; Zou, Jiaheng (Beijing, Inst. High Energy Phys.)

Pages: 7

Abstract: We report the first measurement of the absolute branching fraction for $\Lambda^+_{c}\rightarrow \Lambda \mu^+\nu_{\mu}$. This measurement is based on a sample of $e^+e^-$ annihilation data at a center-of-mass energy of $\sqrt{s}=4.6$ GeV collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb$^{-1}$. The branching fraction is determined to be $\mathcal B({\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu}})=(3.49\pm0.46({\rm stat})\pm0.27({\rm syst}))\%$. In addition, we calculate the ratio $\mathcal{B}(\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu})/\mathcal{B}(\Lambda^+_c\rightarrow \Lambda e^+\nu_{e})$ to be $0.96\pm0.16({\rm stat})\pm0.04({\rm syst})$.

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