D→K_1跃迁形状因子及其在半轻衰变中的应用  

D→K_1 Transition form factors with their applications to semileptonic decays

作　　者：左亚兵[1] 陈国春[1] 田园园[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）》2011年第4期453-460,共8页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(10847142)

摘　　要：跃迁形状因子是描述强子遍举衰变中非微扰QCD相互作用的重要物理量.在重夸克有效场论的框架内,利用光锥求和规则的方法计算了D介子衰变到轴矢量介子K1的跃迁形状因子并在此基础上对D→K1(1270),K1(1400)半轻衰变进行了研究,计算了相应过程的分支比.计算表明D→K1(1 270)半轻衰变过程的分支比为10-3量级,而D→K1(1400)的分支比要小大约两个量级,这些结果可以被将来更为精确的实验所检验.The transition form factors are important in describing the nonperturbative QCD interactions in hadron exclusive decays.In this paper,we calculate the D→K1 transition form factors by using the light cone sum rules in the framework of heavy quark effective field theory.Based on the transition form factors,we study the D→K1（1270）,K1（1400） semileptonic decays and calculated their branching ratios.It is found that the branching ratio for D→K1（1270）semileptonic decay is about 10-3,while the corresponding branching ratio for D→K1（1400） is smaller by two orders of magnitude.The results can be tested by more precise experiments in the future.

关 键 词：形状因子 轴矢量介子 光锥求和规则 分支比 

分 类 号：O572.3[理学—粒子物理与原子核物理]