National Natural Science Foundation of China(11575225,11875277,U1232201,11605220,U1832204);National Key Basic Research Program of China(2015CB856700);Chinese Academy of Sciences(1G201331231172010).
Background The end-cap time-of-flight(TOF)at Beijing Spectrometer was upgraded with multi-gap resistive plate chamber technology in order to improve the particle identification capability in 2015.The offline data qual...
Supported in part by National Natural Science Foundation of China(11575225,11875277,U1232201,11605220,U1832204);National Key Basic Research Program of China(2015CB856700);Chinese Academy of Sciences(1G201331231172010).
Purpose The end cap time of flight(TOF)at Beijing spectrometer was upgraded with multi-gap resistive plate chamber technology in order to improve the particle identification capability in 2015.The offline data quality...
Supported by the Ministry of Science and Technology of China(2009CB825200);National Natural Science Foundation of China(NSFC)(11235011,11322544,11335008,11425524,11475207);the Chinese Academy of Sciences(CAS)Large-Scale Scientific Facility Program;the Collaborative Innovation Center for Particlcs and Interactions(CICPI);Joint Large-Scale Scientific Facility Funds of the NSFC and CAS(11179014);Joint Large-Scale Scientific Facility Funds of the NSFC and CAS(11179007,U1232201,U1532257,U1532258);Joint Funds of the National Natural Science Foundation of China(11079008);CAS(KJCX2-YW-N29,KJCX2-YW-N45);100 Talents Program of CAS;National 1000 Talents Program of China;German Research Foundation DFG(Collaborative Research Center CRC 1044);Istituto Nazionale di Fisica Nucleare,Italy;Koninklijke Nederlandse Akademie van Wetenschappen(KNAW)(530-4CDP03);Ministry of Development of Turkey(DPT2006K-120470);National Natural Science Foundation of China(11205082);The Swedish Research Council,U.S.Department of Energy(DE-FG02-05ER41374,DE-SC-0010118,DE-SC-0010504);U.S.National Science Foundation,University of Groningen(RuG);the Helmholtzzentrum fuer Schwerionenforschung GmbH(GSI);Darmstadt,WCU Program of National Research Foundation of Korea(R32-2008-000-10155-0)
The numbers of ψ(3686) events accumulated by the BESⅢ detector for the data taken during 2009 and 2012 are determined to be(107.0±0.8)×10^6 and(341.1±2.1)×10^6, respectively, by counting inclusive hadronic...
Supported in part by National Natural Science Foundation of China(U1232201,11575225,11605220);National Key Basic Research Program of China(2015CB856700);Chinese Academy of Sciences(1G201331231172010).
Purpose The end cap time of flight at Beijing Spectrometer is upgraded with multi-gap resistive plate chamber technology in order to improve the charged particle identification capability.The time-over-threshold is us...
Supported by National Key Basic Research Program of China(2015CB856700);National Natural Science Foundation of China(NSFC)(10805053,11125525,11175188,11235011,11322544,11335008,11425524);Chinese Academy of Sciences(CAS)Large-Scale Scientific Facility Program;the CAS Center for Excellence in Particle Physics(CCEPP);Collaborative Innovation Center for Particles and Interactions(CICPI);Joint Large-Scale Scientific Facility Funds of NSFC and CAS(11179007,U1232201,U1232107,U1332201);CAS(KJCX2-YW-N29,KJCX2-YW-N45);100 Talents Program of CAS,INPAC;Shanghai Key Laboratory for Particle Physics and Cosmology;German Research Foundation DFG(Collaborative Research Center CRC-1044);Istituto Nazionale di Fisica Nucleare,Italy;Ministry of Development of Turkey(DPT2006K-120470);Russian Foundation for Basic Research(14-07-91152);U.S.Department of Energy(DE-FG02-04ER41291,DE-FG02-05ER41374,DE-FG02-94ER40823,DESC0010118);U.S.National Science Foundation;University of Groningen(RuG);the Helmholtzzentrum fuer Schwerionenforschung GmbH(GSI),Darmstadt;WCU Program of National Research Foundation of Korea(R32-2008-000-10155-0)
A measurement of the number of J/ψ events collected with the BESⅢ detector in 2009 and 2012 is performed using inclusive decays of the J/ψ. The number of J/ψ events taken in 2009 is recalculated to be(223.7±1.4...
Supported by National Key Basic Research Program of China(2015CB856706);National Natural Science Foundation of China(11575222,11205184,11205182,11121092,11475185);Joint Funds of National Natural Science Foundation of China(U1232201)
The relative differences in coordinates of Cylindrical Gas Electron Multiplier Detector-based Inner Tracker(CGEM-IT) clusters are studied to search for track segments in CGEM-IT for the BESIII experiment.With the fu...
Supported by Joint Funds of National Natural Science Foundation of China(U1232201);National Natural Science Foundation of China(11275210,11205182,11205184);National Key Basic Research Program of China(2015CB856700)
Based on J/ψ events collected with the BESIII detector,with corresponding Monte Carlo samples,the tracking efficiency and its systematic uncertainty are studied using a control sample of J/ψ→pp^-π+π^-.Validation...
Supported by National Key Basic Research Program of China(2015CB856700);National Natural Science Foundation of China(11205184,11205182);Joint Funds of National Natural Science Foundation of China(U1232201)
Considering the effects of aging on the existing Inner Drift Chamber (IDC) of BESIII, a GEM-based inner tracker, the Cylindrical-GEM Inner Tracker (CGEM-IT), is proposed to be designed and constructed as an upgrad...