讨论粲强子J/Ψ的衰变模式  

Study of the charm hadron J/Ψ decay modes

作　　者：戴连荣[1] 姜游[1] 康晓珅[1] 王盛华[1] 张宇[1] 

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2010年第3期316-320,共5页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(10975068);辽宁省教育厅创新团队项目(2009T055)

摘　　要：在幺正手征微扰方法下讨论了粲强子J/Ψ衰变的两种模式.第一种衰变模式是J/Ψ衰变为一个矢量介子和一个标量介子的过程,很多实验结果可以通过这一理论得到很好的描述,此时其标量介子被认为是通过赝标量介子-赝标量介子相互作用动力学产生的标量共振态.受此工作启发,这一理论进一步被推广到研究粲强子J/Ψ衰变为一个矢量介子和一个张量介子的过程,此时张量介子被认为是通过矢量介子-矢量介子相互作用动力学产生的张量共振态.讨论了这种新的衰变模式,通过比较理论计算结果和感兴趣的北京谱仪上的实验数据,发现只需要引入1个参数就可以很好地描述实验上4个独立过程的衰变分支比,从而表明提出的这一新衰变方式可以合理地描述目前已知的实验数据.The decay mode of the charm J/Ψ hadron into a vector meson and a scalar resonance,takin ginto account the nature of the resonance as dynamically generated state from pseudoscalar-pseudoscalar interaction has obtained success and many experimental data can be reasonably described within the unitary chiral perturbation approach.Inspired by this,the decay mode of the J/Ψ into a vector meson and a tensor resonance,taking into account the nature of some resonances as dynamically generated states from the vector meson-vector meson interaction,will be further discussed.We compare the theoretical results and some interesting experimental data including BES collaboration and find four experimentalratios of partial decay widths can be reasonably described using only one parameter within this unitarychiral approach.It seems that this new decay mode can describe the present experimental data well.

关 键 词：幺正手征微扰理论 粲强子J/Ψ 衰变宽度分支比 

分 类 号：O412.3[理学—理论物理]