Search for the rare semi-leptonic decay J/\u03c8 \u2192 D\u2212e+\u03bde + c.c.

M Ablikim,U Wiedner,Yifan Yang ,K H Qi,D Y Wang,J H Yin,C Dong,H M Hu,X L Wang,Y B Chen,Y Zhang,Jing Zhu ,G Mezzadri,P L Liu,Q Zhou,S Y Xiao,G Chen,Y Tian ,X P Xu,A Zhemchugov,D Y Chen,A Yuncu,J Libby,D J White,Z Y Zhang,Q A Malik,Ling Zhao ,J L Ping,L Q Huang,Zhi Yang ,J Pettersson,Q Zhao,X K Zhou,Z H Qin,R Kiuchi,Y X Tan,P Adlarson,X Wu,O B Kolcu,H J Li,Y H Tan,J B Liu,L Lavezzi,A Q Guo,C X Liu,Z Qian,H S Chen,L Koch,A A Zafar,S Zhang,J G Lu,Y C Xu,G Zhang,Zhou Li ,S Maldaner,J Q Zhang,A Guskov,J Y Liu,X H Li,C Herold,J J Song,P X Shen,R Kliemt,Z J Xiao,X Y Zhou,M Fritsch,C F Redmer,X Pan,S L Olsen,M X Luo,Z H Lei,W Ikegami Andersson,M M ,X X ,Y D Wang,W M Song,Q J Xu,Q M ,M Bertani,S Nisar,Y Sun ,J J Lane,W Gradl,H Y Zhang,P P Su,Gang Zhao ,Y T Liang,L B Guo,Y X Zhao,Y R Hou,Y K Heng,R E Mitchell,S X Du,F A Harris,N Cao,X H Sun ,G Wilkinson,H Leithoff,I Garzia,S Jin,J L Li,M Qi,J S Yu,S H Zhu,Z Y Li,X H Mo,X S Jiang,C P Shen,Y Wang,Z H Zhang,L Y Dong,M H Liu,J P Zheng,Y Y Ji,N Yu Muchnoi,J Zhao,M Kuemmel,X Lou ,M Scodeggio,X H Bai,F X Lu,A Mangoni,H Cai,Q An,X Shi,J Zhang,T J Min,X R Lyu,M Greco,P Patterí ,M L Chen,G Cibinetto,Y B Zhao,H P Wang,J Z Zhang,F H Heinsius,H B Liu,L Yan,B C Ke,Z Jiao,W C Yan,Y Liu,W M Liu,X D Zhang,A Pathak,X Wang,A Rivetti,Y X Song,G A Chelkov ,Z Zhao ,N Kalantar‐Nayestanaki ,L Fava,C X Yu,C D Fu,Y Zeng,Y Bai,L Gong,R E De Boer,M Albrecht,J Bloms,F E Maas,D Bettoni,Y P Guo,H S Sang,K Goetzen,T Hussain,Xu Yan ,X P Qin,H R Qi,L Liu,I Uman,C Heinz ,X Zeng,T Y Qi,K J Zhu,K Begzsuren,M Rump,M Q Jing,O Bakina,L L Wang,Y Zheng,K Li,H L ,Ch Rosner,N Berger,A Dbeyssi,Zhong Chen ,C W Wang,H F Shen,C Li,X R Chen,K Peters,Z Y Deng,B S Zou,S Marcello,A Gilman,G S Huang,I B Nikolaev,X T Huang,W Y Han,B Zhong,Z Q Liu,M Himmelreich,A Q Zhang,S J Zhao,W H Tian,Z J Chen,F Yan,Y Zhu ,G F Cao,Z P Mao,F F Sui,Y Z Sun,X S Kang,L J Wu,W S Cheng,Z Ning,H B Jiang,W L Chang,Z Y Wang,H Zhang,J F Qiu,G F Xu,J Dong,C Q Feng,S A Çetin ,J Q Li,Y B Liu,J M Li ,F Li,F H Liu,A Lavania,M Pelizaeus,W Y Sun,R Q ,J F Shangguan,J Fang,K Wang,C F Qiao,J L Zhang,Z Huang,C Schnier,W Shan,B Kopf,Y Gao,M Kavatsyuk,Y Hu,X Cai,R Baldini Ferroli,Q P Ji,J H Feng,A Amoroso,Y Ding,L M Zhang,B J Liu,F Liu,W Wang,P R Li,H Li,S Sosio,T Yu,H Liu,Y Schelhaas,T Y Xing,A N Zhu,W B Yan,W Xu,R Poling,S Nakhoul,J L Liu,C Z Yuan,I R Boyko ,R G Ping,C H Li,Y J Mao,P W Luo,F Bianchi,C Geng,J W Zhang,H M Liu,S P Wen,X Yuan ,S Ahmed,Z A Zhu,S F Zhang,T Lenz,X B Ji,L L ,H Xiao,Z Y You ,Y L Fan,T Liu,R Kappert,Yuan Li ,L M Gu,A Sarantsev,R Aliberti,M Shao,S B Liu,M H Gu,W Kühn,R S Shi,G Felici,C X Yue,H C Shi,T Luo,S Spataro,J G Messchendorp,F Feldbauer,B Wang,F Cossio,Y P Lu,M Maggiora,H Peng ,J F Chang,T Hu,X Dong,C X Lin,Z Wang,F Weidner,M Rolo,W J Zhu,J D Lu,S S Fang,V Rodin,Zhi Wang ,S Qian,T Johansson,L Q Zhang,I Denysenko,L Sun,Jinfei Wu ,S L Yang,K Ravindran,X Y Zhang,L Wollenberg,Y Ban,Y Yang,H X Yang,H H Zhang,T Sun,Y Nefedov,I K Keshk,X Y Shen,H Muramatsu,F Nerling,J F Hu,G Y Hou,R P Guo,X L Luo,S Y Li,Y F Liang,L K Li,J S Lange,Y Jin,Y Pan,W Qian ,K H Rashid,J X Teng,М Н Ачасов ,C J Tang,J J Zhang,X L Li,S Malde,G R Liao,P Kiese,M Lellmann,L Z Liao,M Kuessner,G Rong,W P Wang,N Hüsken,D M Li,Y J Sun,W D Li,Y H Zhang,G Yu,M Wolke,L Li,Z Y Yuan,E Gersabeck ,Z A Liu,G Li,S J Chen,J F Sun,L H Wu,M Ye,W X Gong,S S Sun,X C Dai,P Larin,R Farinelli,K Schoenning,Y Huang ,M H Ye,C L Luo,L Zhang,K L He,W Imoehl,Z T Sun,X H Xie,H J Lü ,H L Dai,X Q Hao,M Wang,M G Kurth,X L Lu,D Liu,X F Wang,D C Shan,Z L Hou,W G Li,S Janchiv,T J Zhu,K X Su,T Held,T Holtmann,P Ge ,Y Fang,L Xia,S Q Qu,X L Ji,R T ,L Yang,Y T Gu,I Balossino,A Kupść ,X F Cui,H B Li,H J Wang,M Irshad,X S Qin,S Pacetti,V Prasad,X Y ,B X Zhang,M R An,M Destefanis,Y Y Wang,Z Meng ,D H Wei,Tao Han ,S Liu,C Y Guan ,X R Zhou,W H Wang,K Y Liu,S Gu,G Y Tang,S Jaeger,J Tang,Qin Liu ,D V Dedovich ,F De Mori,A Denig,Y Yuan,K Liu,H Liang,B X Yu,A Bortone,X Li,M G Zhao,Y Q Wang,M Z Wang,Q Ouyang,Y Xie ,G X Sun,F C ,H J Yang,Y F Wang,R A Briere,Q Liu,J B Jiao,J Y Zhang,Y T Zhang,X Liu,M Y Dong,B Zheng,A Calcaterra,X Y Shan,H K Sun,A Khoukaz,Y J Mo,V Thoren,J H Zou

doi:10.1007/jhep06(2021)157

Abstract

Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy sqrt{s} = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

Highlights

BESIII detector and Monte Carlo simulationThe BESIII detector [21] records symmetric e+e− collisions provided by the BEPCII storage ring [22], which operates with a peak luminosity of 1 × 1033 cm−2 s−1 in the center-of-mass energy range from 2.0 to 4.95 GeV
Signal MC Inclusive MC Umiss (GeV)expand the fit range by 6 MeV on either side and simultaneously change the background shape to a second-order polynomial
Based upon a sample of 10.1 × 109 J/ψ events collected with the BESIII detector, the BF of the rare semi-leptonic decay J/ψ → D−e+νe is studied with a semi-blind analysis

Summary

BESIII detector and Monte Carlo simulation

The BESIII detector [21] records symmetric e+e− collisions provided by the BEPCII storage ring [22], which operates with a peak luminosity of 1 × 1033 cm−2 s−1 in the center-of-mass energy range from 2.0 to 4.95 GeV. BESIII has collected large data samples in this energy region [11]. The EMC measures photon energies with a resolution of 2.5% (5%) at 1 GeV in the barrel (end cap) region. The time resolution in the TOF barrel region is 68 ps, while that in the end cap region is 110 ps. Cap TOF system was upgraded in 2015 using multi-gap resistive plate chamber technology, providing a time resolution of 60 ps [23, 24]. Simulated data samples produced with the geant4-based [25] MC package BOOST [26], which includes the geometric and material description of the BESIII detector [27, 28] and the detector response, are used to determine detection efficiencies and to estimate backgrounds. Final state radiation (FSR) from charged final state particles is incorporated using the photos package [35]

Event selection and data analysis

Result

Background

Systematic uncertainty

Summary