BESⅢ上粲介子半轻衰变D_s^+→K^(0)e^+ν_e和D_s^+→K^(*0)e^+ν_e的蒙特卡罗研究  

Monte Carlo Studies of Semileptonic Decays for D_s^+→K^(0)e^+ν_e and D_s^+→K^(*0)e+ν_e at BESⅢ

作　　者：李蕾[1] 闵瀚云 Li Le;Min Hanyun(Beijing Institute of Petro-chemical Technology,Beijing 102617,China)

机构地区：[1]北京石油化工学院,北京102617

出　　处：《北京石油化工学院学报》2018年第1期75-78,共4页Journal of Beijing Institute of Petrochemical Technology

基　　金：国家自然科学基金项目(11505010,11775027);北京市教育委员会科技计划一般项目(KM201610017009);北京市优秀人才资助项目(2015000020124G064);北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划项目(CIT&TCD201704047);北京市自然科学基金项目(1132010);北京市国家级大学生创新创业训练计划项目(2016J00001,2016J00062,2016J00154)

摘　　要：通过分析在质心系能量s^(1/2)=4.18GeV处产生的蒙特卡罗样本,模拟测量了奇异粲介子D_s^+半轻衰变过程D_s^+→K^(0)e^+ν_e和D_s^+→K^(*0)e^+ν_e的绝对分支比。通过蒙特卡罗模拟,预期了BESⅢ实验对这2个半轻衰变分支比的测量精度。研究表明,如果BESⅢ实验在质心系能量s^(1/2)=4.18GeV采集3.2fb^(-1)的实验数据,D_s^+→K^(0)e^+ν_e和D_s^+→K^(*0)e^+ν_e衰变分支比的测量精度能够达到11.2%与12.5%。We simulate the measurement of the absolute branching fractions for D+s semileptonic decays D+s→K 0e+νe and D+s→K*0 e+νe by analyzing the Monte Carlo events generated at s=4.18 GeV.Based on the study of the Monte Carlo events,we find out that the precisions of branching fractions for D+s→K 0e+νe and D+s→K*0 e+νe will be measured to be 11.2%and 12.5%,respectively,with 3.2 fb-1 data collected with the BESIII detector at the BEPCII collider.Such kind of measurements will be of great importance in understanding the decay mechanisms of semileptonic decays.

关 键 词：奇异粲介子 卡比堡压制半轻衰变 衰变分支比 测量精度 

分 类 号：O572.21[理学—粒子物理与原子核物理]