Measurement of integrated luminosity and center-of-mass energy of data taken by BESⅢ at s1/2=2.125 GeV

作者：麦迪娜; M.N.Achasov; S.Ahmed; 艾小聪; O.Albayrak; M.Albrecht; D.J.Ambrose; A.Amoroso; 安芬芬; 安琪; 白景芝; R.Baldini Ferroli; 班勇; D.W.Bennett; J.V.Bennett; N.Berger; M.Bertani; D.Bettoni; 边渐鸣; F.Blanchi; E.Boger; I.Boyko; R.A.Briere; 蔡浩; 蔡啸; O.Cakir; A.Calcaterra; 曹国富; S.A.Cetin; J.Chai; **帆; G.Chelkov; 陈刚; 陈和生; 陈江川; 陈玛丽; 陈实; 陈申见; 堪炫; 陈旭荣; 陈元柏; 程和平; 褚新坤; G.Cibinetto; 代洪亮; 代建平; A.Dbeyssi; D.Dedovich; 邓子艳; A.Denig; I.Denysenko; M.Destefanis; F.DEMori; 丁勇; 董超; 董静; 董燎原; 董明义; 豆正磊; 杜书先; 段鹏飞; 范荆州; 方建; 房双世; 方馨; 方易

来源：Chinese Physics C, 2017, 41(11): 7-15.

• Bhabha scattering
• luminosity
• radiative dimuon events
• center-of-mass energy

To study the nature of the state Y(2175),a dedicated data set of e~ + e-collision data was collected at the center-of-mass energy of 2.125 GeV with the BESⅢ detector at the BEPCⅡ collider.By analyzing large-angle Bhabha scattering events,the integrated luminosity of this data set is determined to be 108.49±0.02±0.85 pb-1,where the first uncertainty is statistical and the second one is systematic.In addition,the center-of-mass energy of the data set is determined with radiative dimuon events to be 2126.55±0.03±0.85 MeV,where the first uncertainty is statistical and the second one is systematic.

• 单位
  北京大学; 河南大学; 清华大学; 华中师范大学; 广西大学; 中国科学院大学; 郑州大学; 南京师范大学; 四川大学; 中国科学技术大学; 辽宁大学; 南开大学; 上海交通大学; 中山大学; University of Mainz; University of Groningen; 山西大学; 浙江大学; 杭州师范大学; 南京大学