| 中文摘要 | 利用工作在北京正负电子对撞机(BEPC)上的北京谱仪(BES)收集到的33pb-1的Ψ(3770)数据,寻找D 介子味道改变中性流(FCNC)和轻子数不守恒(LNV)的稀有衰变,包括4个D0介子的衰变模式(K-0e+e-,φe+e-, ρ0e+e-和K-*0e+e-)和6个D+介子的衰变模式(K-e+e-,K+e+e-,π-e+e+,π+e+e-,K*-e+e+和K*+e+e-)．没有发现信号,给出90％置信水平的上限．其中,D+介子的两个衰变模式D+→K*-e+e+和D+→K*+e+e-的上限是首次测量．; A search for flavor changing neutral current (FCNC) and lepton number violation (LNV) decays of charmed D mesons is performed using 33pb-1 data around Ψ(3770) collected by BES Ⅱ detector at BEPC. Four decay modes of D0(K-0e+e-,φe+e-,ρ0e+e- and K-*0e+e-) and six decay modes of D+(K-e+e+, K+e+e-,π-e+e+, π+e+e-, K*- e+e+ and K*+e+e-) are presented. No evidence is found for the above decays, therefore, the upper limits at 90% confidence level are set. The limits of two D+ decays modes, D+→K*-e+e+和D+→K*+e+e- have not been reported previously.; 国家自然科学基金(10491300,10225522,10225524,10225525,10425525) 中国科学院“九五”重大及特别支持项目(KJ95T-03) 中国科学院“百人计划”基金(U-11,U-24,U-25) 中国科学院如识创新基金(U-602,U-34)资助~~ |
修改评论