摘要
                
                    基于新西伯利亚VEPP-4M正负电子对撞机的KEDR探测器采集的数据,报道了质心能量在3.12~3.72GeV之间7个能量点的Ruds和R值的精确测量结果.同时报道了J/ψ共振态衰变的电子和强子的联合分宽度.
                
                The result is presented of precise measurement the values of Rudsand Rat seven points of the center-of-mass energy between 3.12 and 3.72 GeV based on the data collected with the KEDR detector at the VEPP-4Me^+e^-collider in Novosibirsk.Also present is the preliminary result of determination of the product of the electron partial width by the branching fraction into hadrons of J/ψ resonance.
    
    
    
    
            
                基金
                    Supported by Russian Science Foundation(14-50-00080)
                    Presidential Scholarship(SP5889:2013:2)