通过τ⁺→e⁺νₑν̅τ测量Dₛ⁺→τ⁺ντ的绝对分支比
Measurement of the Absolute Branching Fraction of D_{s}^{+}→τ^{+}ν_{τ} via τ^{+}→e^{+}ν_{e}ν[over ¯]_{τ}.
作者信息
Ablikim M, Achasov M N, Adlarson P, Ahmed S, Albrecht M, Aliberti R, Amoroso A, An M R, An Q, Bai X H, Bai Y, Bakina O, Baldini Ferroli R, Balossino I, Ban Y, Begzsuren K, Berger N, Bertani M, Bettoni D, Bianchi F, Bloms J, Bortone A, Boyko I, Briere R A, Cai H, Cai X, Calcaterra A, Cao G F, Cao N, Cetin S A, Chang J F, Chang W L, Chelkov G, Chen D Y, Chen G, Chen H S, Chen M L, Chen S J, Chen X R, Chen Y B, Chen Z J, Cheng W S, Cibinetto G, Cossio F, Cui X F, Dai H L, Dai X C, Dbeyssi A, de Boer R E, Dedovich D, Deng Z Y, Denig A, Denysenko I, Destefanis M, De Mori F, Ding Y, Dong C, Dong J, Dong L Y, Dong M Y, Dong X, Du S X, Fan Y L, Fang J, Fang S S, Fang Y, Farinelli R, Fava L, Feldbauer F, Felici G, Feng C Q, Feng J H, Fritsch M, Fu C D, Gao Y, Gao Y, Gao Y, Gao Y G, Garzia I, Ge P T, Geng C, Gersabeck E M, Gilman A, Goetzen K, Gong L, Gong W X, Gradl W, Greco M, Gu L M, Gu M H, Gu S, Gu Y T, Guan C Y, Guo A Q, Guo L B, Guo R P, Guo Y P, Guskov A, Han T T, Han W Y, Hao X Q, Harris F A, He K L, Heinsius F H, Heinz C H, Held T, Heng Y K, Herold C, Himmelreich M, Holtmann T, Hou G Y, Hou Y R, Hou Z L, Hu H M, Hu J F, Hu T, Hu Y, Huang G S, Huang L Q, Huang X T, Huang Y P, Huang Z, Hussain T, Hüsken N, Ikegami Andersson W, Imoehl W, Irshad M, Jaeger S, Janchiv S, Ji Q, Ji Q P, Ji X B, Ji X L, Ji Y Y, Jiang H B, Jiang X S, Jiao J B, Jiao Z, Jin S, Jin Y, Jing M Q, Johansson T, Kalantar-Nayestanaki N, Kang X S, Kappert R, Kavatsyuk M, Ke B C, Keshk I K, Khoukaz A, Kiese P, Kiuchi R, Kliemt R, Koch L, Kolcu O B, Kopf B, Kuemmel M, Kuessner M, Kupsc A, Kurth M G, Kühn W, Lane J J, Lange J S, Larin P, Lavania A, Lavezzi L, Lei Z H, Leithoff H, Lellmann M, Lenz T, Li C, Li C H, Li Cheng, Li D M, Li F, Li G, Li H, Li H, Li H B, Li H J, Li J L, Li J Q, Li J S, Li Ke, Li L K, Li Lei, Li P R, Li S Y, Li W D, Li W G, Li X H, Li X L, Li Xiaoyu, Li Z Y, Liang H, Liang H, Liang H, Liang Y F, Liang Y T, Liao G R, Liao L Z, Libby J, Lin C X, Liu B J, Liu C X, Liu D, Liu F H, Liu Fang, Liu Feng, Liu H B, Liu H M, Liu Huanhuan, Liu Huihui, Liu J B, Liu J L, Liu J Y, Liu K, Liu K Y, Liu L, Liu M H, Liu P L, Liu Q, Liu Q, Liu S B, Liu Shuai, Liu T, Liu W M, Liu X, Liu Y, Liu Y B, Liu Z A, Liu Z Q, Lou X C, Lu F X, Lu H J, Lu J D, Lu J G, Lu X L, Lu Y, Lu Y P, Luo C L, Luo M X, Luo P W, Luo T, Luo X L, Lyu X R, Ma F C, Ma H L, Ma L L, Ma M M, Ma Q M, Ma R Q, Ma R T, Ma X X, Ma X Y, Maas F E, Maggiora M, Maldaner S, Malde S, Mangoni A, Mao Y J, Mao Z P, Marcello S, Meng Z X, Messchendorp J G, Mezzadri G, Min T J, Mitchell R E, Mo X H, Mo Y J, Muchnoi N Yu, Muramatsu H, Nakhoul S, Nefedov Y, Nerling F, Nikolaev I B, Ning Z, Nisar S, Olsen S L, Ouyang Q, Pacetti S, Pan X, Pan Y, Pathak A, Patteri P, Pelizaeus M, Peng H P, Peters K, Pettersson J, Ping J L, Ping R G, Poling R, Prasad V, Qi H, Qi H R, Qi K H, Qi M, Qi T Y, Qian S, Qian W B, Qian Z, Qiao C F, Qin L Q, Qin X P, Qin X S, Qin Z H, Qiu J F, Qu S Q, Rashid K H, Ravindran K, Redmer C F, Rivetti A, Rodin V, Rolo M, Rong G, Rosner Ch, Rump M, Sang H S, Sarantsev A, Schelhaas Y, Schnier C, Schoenning K, Scodeggio M, Shan D C, Shan W, Shan X Y, Shangguan J F, Shao M, Shen C P, Shen H F, Shen P X, Shen X Y, Shi H C, Shi R S, Shi X, Shi X D, Song J J, Song W M, Song Y X, Sosio S, Spataro S, Su K X, Su P P, Sui F F, Sun G X, Sun H K, Sun J F, Sun L, Sun S S, Sun T, Sun W Y, Sun W Y, Sun X, Sun Y J, Sun Y K, Sun Y Z, Sun Z T, Tan Y H, Tan Y X, Tang C J, Tang G Y, Tang J, Teng J X, Thoren V, Tian W H, Tian Y T, Uman I, Wang B, Wang C W, Wang D Y, Wang H J, Wang H P, Wang K, Wang L L, Wang M, Wang M Z, Wang Meng, Wang W, Wang W H, Wang W P, Wang X, Wang X F, Wang X L, Wang Y, Wang Y, Wang Y D, Wang Y F, Wang Y Q, Wang Y Y, Wang Z, Wang Z Y, Wang Ziyi, Wang Zongyuan, Wei D H, Weidner F, Wen S P, White D J, Wiedner U, Wilkinson G, Wolke M, Wollenberg L, Wu J F, Wu L H, Wu L J, Wu X, Wu Z, Xia L, Xiao H, Xiao S Y, Xiao Z J, Xie X H, Xie Y G, Xie Y H, Xing T Y, Xu G F, Xu Q J, Xu W, Xu X P, Xu Y C, Yan F, Yan L, Yan W B, Yan W C, Yan Xu, Yang H J, Yang H X, Yang L, Yang S L, Yang Y X, Yang Yifan, Yang Zhi, Ye M, Ye M H, Yin J H, You Z Y, Yu B X, Yu C X, Yu G, Yu J S, Yu T, Yuan C Z, Yuan L, Yuan X Q, Yuan Y, Yuan Z Y, Yue C X, Yuncu A, Zafar A A, Zeng Y, Zeng Y, Zhang A Q, Zhang B X, Zhang Guangyi, Zhang H, Zhang H H, Zhang H H, Zhang H Y, Zhang J J, Zhang J L, Zhang J Q, Zhang J W, Zhang J Y, Zhang J Z, Zhang Jianyu, Zhang Jiawei, Zhang L M, Zhang L Q, Zhang Lei, Zhang S, Zhang S F, Zhang Shulei, Zhang X D, Zhang X Y, Zhang Y, Zhang Y H, Zhang Y T, Zhang Yan, Zhang Yao, Zhang Yi, Zhang Z H, Zhang Z Y, Zhao G, Zhao J, Zhao J Y, Zhao J Z, Zhao Lei, Zhao Ling, Zhao M G, Zhao Q, Zhao S J, Zhao Y B, Zhao Y X, Zhao Z G, Zhemchugov A, Zheng B, Zheng J P, Zheng Y, Zheng Y H, Zhong B, Zhong C, Zhou L P, Zhou Q, Zhou X, Zhou X K, Zhou X R, Zhou X Y, Zhu A N, Zhu J, Zhu K, Zhu K J, Zhu S H, Zhu T J, Zhu W J, Zhu W J, Zhu Y C, Zhu Z A, Zou B S, Zou J H
机构信息
Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
出版信息
Phys Rev Lett. 2021 Oct 22;127(17):171801. doi: 10.1103/PhysRevLett.127.171801.
Using a dataset of 6.32 fb^{-1} of e^{+}e^{-} annihilation data collected with the BESIII detector at center-of-mass energies between 4178 and 4226 MeV, we have measured the absolute branching fraction of the leptonic decay D_{s}^{+}→τ^{+}ν_{τ} via τ^{+}→e^{+}ν_{e}ν[over ¯]{τ}, and find B{D_{s}^{+}→τ^{+}ν_{τ}}=(5.27±0.10±0.12)×10^{-2}, where the first uncertainty is statistical and the second is systematic. The precision is improved by a factor of 2 compared to the previous best measurement. Combining with f_{D_{s}^{+}} from lattice quantum chromodynamics calculations or the |V_{cs}| from the CKMfitter group, we extract |V_{cs}|=0.978±0.009±0.012 and f_{D_{s}^{+}}=(251.1±2.4±3.0) MeV, respectively. Combining our result with the world averages of B_{D_{s}^{+}→τ^{+}ν_{τ}} and B_{D_{s}^{+}→μ^{+}ν_{μ}}, we obtain the ratio of the branching fractions B_{D_{s}^{+}→τ^{+}ν_{τ}}/B_{D_{s}^{+}→μ^{+}ν_{μ}}=9.72±0.37, which is consistent with the standard model prediction of lepton flavor universality.
利用北京谱仪III（BESIII）探测器在质心能量为4178至4226兆电子伏特之间收集的6.32飞靶^{-1}的正负电子对撞数据，我们通过τ^{+}→e^{+}ν_{e}ν[上划线]{τ}测量了轻子衰变D{s}^{+}→τ^{+}ν_{τ} 的绝对分支比，结果为B_{D_{s}^{+}→τ^{+}ν_{τ}}=(5.27±0.10±0.12)×10^{-2}，其中第一个不确定度为统计不确定度，第二个为系统不确定度。与之前的最佳测量结果相比，精度提高了一倍。结合格点量子色动力学计算得到的f_{D_{s}^{+}}或CKMfitter组得到的|V_{cs}|，我们分别提取出|V_{cs}|=0.978±0.009±0.012和f_{D_{s}^{+}}=(251.1±2.4±3.0)兆电子伏特。将我们的结果与D_{s}^{+}→τ^{+}ν_{τ}和D_{s}^{+}→μ^{+}ν_{μ}的世界平均值相结合，我们得到分支比的比值B_{D_{s}^{+}→τ^{+}ν_{τ}}/B_{D_{s}^{+}→μ^{+}ν_{μ}}=9.72±0.37，这与轻子味普适性的标准模型预测一致。
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