纯轻子衰变\(D_{s}^{*+}→e^{+}ν_{e}\)的首次实验研究。

First Experimental Study of the Purely Leptonic Decay D_{s}^{*+}→e^{+}ν_{e}.

作者信息

Ablikim M, Achasov M N, Adlarson P, Aliberti R, Amoroso A, An M R, An Q, Bai Y, Bakina O, Balossino I, Ban Y, Batozskaya V, Begzsuren K, Berger N, Berlowski M, Bertani M, Bettoni D, Bianchi F, Bianco E, Bloms J, Bortone A, Boyko I, Briere R A, Brueggemann A, Cai H, Cai X, Calcaterra A, Cao G F, Cao N, Cetin S A, Chang J F, Chang T T, Chang W L, Che G R, Chelkov G, Chen C, Chen Chao, Chen G, Chen H S, Chen M L, Chen S J, Chen S M, Chen T, Chen X R, Chen X T, Chen Y B, Chen Y Q, Chen Z J, Cheng W S, Choi S K, Chu X, Cibinetto G, Coen S C, Cossio F, Cui J J, Dai H L, Dai J P, Dbeyssi A, de Boer R E, Dedovich D, Deng Z Y, Denig A, Denysenko I, Destefanis M, De Mori F, Ding B, Ding X X, Ding Y, Ding Y, Dong J, Dong L Y, Dong M Y, Dong X, Du S X, Duan Z H, Egorov P, Fan Y L, Fang J, Fang S S, Fang W X, Fang Y, Farinelli R, Fava L, Feldbauer F, Felici G, Feng C Q, Feng J H, Fischer K, Fritsch M, Fritzsch C, Fu C D, Fu J L, Fu Y W, Gao H, Gao Y N, Gao Yang, Garbolino S, Garzia I, Ge P T, Ge Z W, Geng C, Gersabeck E M, Gilman A, Goetzen K, Gong L, Gong W X, Gradl W, Gramigna S, Greco M, Gu M H, Gu Y T, Guan C Y, Guan Z L, Guo A Q, Guo L B, Guo R P, Guo Y P, Guskov A, Hou X T, Han T T, Han W Y, Hao X Q, Harris F A, He K K, He K L, Heinsius F H H, Heinz C H, Heng Y K, Herold C, Holtmann T, Hong P C, Hou G Y, Hou Y R, Hou Z L, Hu H M, Hu J F, Hu T, Hu Y, Huang G S, Huang K X, Huang L Q, Huang X T, Huang Y P, Hussain T, Hüsken N, Imoehl W, Irshad M, Jackson J, Jaeger S, Janchiv S, Jeong J H, Ji Q, Ji Q P, Ji X B, Ji X L, Ji Y Y, Jia Z K, Jiang P C, Jiang S S, Jiang T J, Jiang X S, Jiang Y, Jiao J B, Jiao Z, Jin S, Jin Y, Jing M Q, Johansson T, Kui X, Kabana S, Kalantar-Nayestanaki N, Kang X L, Kang X S, Kappert R, Kavatsyuk M, Ke B C, Khoukaz A, Kiuchi R, Kliemt R, Koch L, Kolcu O B, Kopf B, Kuessner M K, Kupsc A, Kühn W, Lane J J, Lange J S, Larin P, Lavania A, Lavezzi L, Lei T T, Lei Z H, Leithoff H, Lellmann M, Lenz T, Li C, Li C, Li C H, Li Cheng, Li D M, Li F, Li G, Li H, Li H B, Li H J, Li H N, Li Hui, Li J R, Li J S, Li J W, Li Ke, Li L J, Li L K, Li Lei, Li M H, Li P R, Li S X, Li T, Li W D, Li W G, Li X H, Li X L, Li Xiaoyu, Li Y G, Li Z J, Li Z X, Li Z Y, Liang C, Liang H, Liang H, Liang H, Liang Y F, Liang Y T, Liao G R, Liao L Z, Libby J, Limphirat A, Lin D X, Lin T, Liu B J, Liu B X, Liu C, Liu C X, Liu D, Liu F H, Liu Fang, Liu Feng, Liu G M, Liu H, 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 Ke, Liu L, Liu L C, Liu Lu, Liu M H, Liu P L, Liu Q, Liu S B, Liu T, Liu W K, 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 G, Lu X L, Lu Y, Lu Y P, Lu Z H, Luo C L, Luo M X, Luo T, Luo X L, Lyu X R, Lyu Y F, Ma F C, Ma H L, Ma J L, Ma L L, Ma M M, Ma Q M, Ma R Q, Ma R T, Ma X Y, Ma 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, Miao H, Min T J, Mitchell R E, Mo X H, Muchnoi N Yu, Nefedov Y, Nerling F, Nikolaev I B, Ning Z, Nisar S, Niu Y, Olsen S L, Ouyang Q, Pacetti S, Pan X, Pan Y, Pathak A, Patteri P, Pei Y P, Pelizaeus M, Peng H P, Peters K, Ping J L, Ping R G, Plura S, Pogodin S, Prasad V, Qi F Z, Qi H, Qi H R, Qi M, Qi T Y, Qian S, Qian W B, Qiao C F, Qin J J, Qin L Q, Qin X P, Qin X S, Qin Z H, Qiu J F, Qu S Q, Redmer C F, Ren K J, Rivetti A, Rodin V, Rolo M, Rong G, Rosner Ch, Ruan S N, Salone N, Sarantsev A, Schelhaas Y, Schoenning K, Scodeggio M, Shan K Y, Shan W, Shan X Y, Shangguan J F, Shao L G, Shao M, Shen C P, Shen H F, Shen W H, Shen X Y, Shi B A, Shi H C, Shi J L, Shi J Y, Shi Q Q, Shi R S, Shi X, Song J J, Song T Z, Song W M, Song Y J, Song Y X, Sosio S, Spataro S, Stieler F, Su Y J, Sun G B, Sun G X, Sun H, Sun H K, Sun J F, Sun K, Sun L, Sun S S, Sun T, Sun W Y, Sun Y, Sun Y J, Sun Y Z, Sun Z T, Tan Y X, Tang C J, Tang G Y, Tang J, Tang Y A, Tao L Y, Tao Q T, Tat M, Teng J X, Thoren V, Tian W H, Tian W H, Tian Z F, Uman I, Wang B, Wang B L, Wang Bo, Wang C W, Wang D Y, Wang F, Wang H J, Wang H P, Wang K, Wang L L, Wang M, Wang Meng, Wang S, Wang S, Wang T, Wang T J, Wang W, Wang W, Wang W H, Wang W P, Wang X, Wang X F, Wang X J, Wang X L, Wang Y, Wang Y D, Wang Y F, Wang Y H, Wang Y N, Wang Y Q, Wang Yaqian, Wang Yi, Wang Z, Wang Z L, Wang Z Y, Wang Ziyi, Wei D, Wei D H, Weidner F, Wen S P, Wenzel C W, Wiedner U W, Wilkinson G, Wolke M, Wollenberg L, Wu C, Wu J F, Wu L H, Wu L J, Wu X, Wu X H, Wu Y, Wu Y J, Wu Z, Xia L, Xian X M, Xiang T, Xiao D, Xiao G Y, Xiao H, Xiao S Y, Xiao Y L, Xiao Z J, Xie C, Xie X H, Xie Y, Xie Y G, Xie Y H, Xie Z P, Xing T Y, Xu C F, Xu C J, Xu G F, Xu H Y, Xu Q J, Xu Q N, Xu W, Xu W L, Xu X P, Xu Y C, Xu Z P, Xu Z S, Yan F, Yan L, Yan W B, Yan W C, Yan X Q, Yang H J, Yang H L, Yang H X, Yang Tao, Yang Y, Yang Y F, Yang Y X, Yang Yifan, Yang Z W, Ye M, Ye M H, Yin J H, You Z Y, Yu B X, Yu C X, Yu G, Yu T, Yu X D, Yuan C Z, Yuan L, Yuan S C, Yuan X Q, Yuan Y, Yuan Z Y, Yue C X, Zafar A A, Zeng F R, Zeng X, Zeng Y, Zeng Y J, Zhai X Y, Zhan Y H, Zhang A Q, Zhang B L, Zhang B X, Zhang D H, Zhang G Y, Zhang H, Zhang H H, Zhang H H, Zhang H Q, Zhang H Y, Zhang J J, Zhang J L, Zhang J Q, Zhang J W, Zhang J X, Zhang J Y, Zhang J Z, Zhang Jianyu, Zhang Jiawei, Zhang L M, Zhang L Q, Zhang Lei, Zhang P, Zhang Q Y, Zhang Shuihan, Zhang Shulei, Zhang X D, Zhang X M, Zhang X Y, Zhang X Y, Zhang Y, Zhang Y, Zhang Y T, Zhang Y H, Zhang Yan, Zhang Yao, Zhang Z H, Zhang Z L, Zhang Z Y, Zhang Z Y, Zhao G, Zhao J, Zhao J Y, Zhao J Z, Zhao Lei, Zhao Ling, Zhao M G, Zhao S J, Zhao Y B, Zhao Y X, Zhao Z G, Zhemchugov A, Zheng B, Zheng J P, Zheng W J, Zheng Y H, Zhong B, Zhong X, Zhou H, Zhou L P, Zhou X, Zhou X K, Zhou X R, Zhou X Y, Zhou Y Z, Zhu J, Zhu K, Zhu K J, Zhu L, Zhu L X, Zhu S H, Zhu S Q, Zhu T J, Zhu W J, Zhu Y C, Zhu Z A, Zou J H, Zu J

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. 2023 Oct 6;131(14):141802. doi: 10.1103/PhysRevLett.131.141802.

DOI:10.1103/PhysRevLett.131.141802

PMID:37862669

Abstract

Using 7.33 fb^{-1} of e^{+}e^{-} collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay D_{s}^{+}→e^{+}ν_{e}. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of D_{s}^{+}→e^{+}ν_{e} is measured to be (2.1_{-0.9_{stat}}^{+1.2}±0.2_{syst})×10^{-5}, corresponding to an upper limit of 4.0×10^{-5} at the 90% confidence level. Taking the total width of the D_{s}^{+} [(0.070±0.028) keV] predicted with the radiative D_{s}^{+} decay from the lattice QCD calculation as input, the decay constant of the D_{s}^{+} is determined to be f_{D_{s}^{+}}=(214_{-46_{stat}}^{+61}±44_{syst}) MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.

摘要

利用北京正负电子对撞机（BEPCII）上的北京谱仪III（BESIII）探测器采集的(7.33,\mathrm{fb}^{-1})的(e^{+}e^{-})对撞数据，我们首次报道了对纯轻子衰变(D_{s}^{+}\to e^{+}\nu_{e})的实验研究。我们的数据包含了该衰变的信号，统计显著性为(2.9\sigma)。测得(D_{s}^{+}\to e^{+}\nu_{e})的分支比为((2.1_{-0.9_{stat}}^{+1.2}\pm0.2_{syst})\times10^{-5})，在(90%)置信水平下对应的上限为(4.0\times10^{-5})。以格点量子色动力学（lattice QCD）计算预测的辐射衰变(D_{s}^{+})的总宽度([(0.070\pm0.028),\mathrm{keV}])作为输入，确定(D_{s}^{+})的衰变常数为(f_{D_{s}^{*+}}=(214_{-46_{stat}}^{+61}\pm44_{syst}),\mathrm{MeV})，在(90%)置信水平下对应的上限为(354,\mathrm{MeV})。