Study of BESIII trigger efficiencies with the 2018 J/ψ data * *Supported in part by National Key Basic Research Program of China (2015CB856700); National Natural Science Foundation of China (NSFC) (11625523, 11635010, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012); the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (U1732263,

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

doi:10.1088/1674-1137/abcfab

Abstract

Using a dedicated data sample taken in 2018 on the J/ψ peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.

Highlights

The Beijing Electron-Positron Collider (BEPCII) is a double-ring multi-bunch e+e− collider with a design luminosity of 1 × 1033 cm−2 s−1, optimized for a center-ofmass energy of 2 × 1.89 GeV, an increase of a factor of 100 more than its predecessor
The Beijing Spectrometer III (BESIII) trigger system combines the information from the electromagnetic calorimeter (EMC), the main drift chamber (MDC), the time-of-flight system (TOF) and the muon counter (MUC) to form a total of 48 trigger conditions (Table 1) to select for readout of interesting interactions
Using a similar approach to that described in Ref. [4], we study the trigger efficiency for the J/ψ events taken in 2018 in order to understand the performance for the updated trigger system

Summary

INTRODUCTION

The Beijing Electron-Positron Collider (BEPCII) is a double-ring multi-bunch e+e− collider with a design luminosity of 1 × 1033 cm−2 s−1, optimized for a center-ofmass energy of 2 × 1.89 GeV, an increase of a factor of 100 more than its predecessor. The BESIII trigger system combines the information from the electromagnetic calorimeter (EMC), the main drift chamber (MDC), the time-of-flight system (TOF) and the muon counter (MUC) to form a total of 48 trigger conditions (Table 1) to select for readout of interest-. Barrel Cluster Back to Back event is read out if any enabled trigger channel is active. Barrel Cluster Balance in φ direction ral events with precise timing information. EClus_Phi Endcap Cluster Balance in φ direction channel described in Table 2 had to be disabled due to in-. Barrel total Energy, Higher threshold creased noise in the MDC, and some other trigger chan-. Total Energy, Lower threshold ger conditions in these trigger channels are already in-. [4], we study the trigger efficiency for the J/ψ events taken in 2018 in order to understand the performance for the updated trigger system Using a similar approach to that described in Ref. [4], we study the trigger efficiency for the J/ψ events taken in 2018 in order to understand the performance for the updated trigger system

DATA SET

Dimuon event selection

CONTROL SAMPLE SELECTION

Bhabha event selection

TRIGGER EFFICIENCY DETERMINATION

Determination of trigger efficiencies

Findings

SUMMARY