D介子衰变中的奇异轴矢介子（英文）  

Strange Axial-vector Mesons in D Meson Decays

作　　者：郭鹏飞 王迪 于福升 GUO Pengfei;WANG Di;YU Fusheng(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Research Center for Hadron and CSR Physics,Lanzhou University and Institute of Modem Physics of CAS,Lanzhou 730000,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]兰州大学与中国科学院近代物理研究所共建强子物理与CSR物理研究中心,兰州730000

出　　处：《原子核物理评论》2019年第2期125-134,共10页Nuclear Physics Review

摘　　要：目前,奇异轴矢介子的性质并没有被很好地理解,而这类介子是可以在D介子衰变中得到更多的研究。将窄宽近似下的等式关系和强衰变中CP守恒应用到四体衰变D0→K+K-π+π-中的D0→K±K1■(1270)(→ρK or K*π)的实验数据中,可以发现实验数据与理论存在矛盾,然而,当考虑更多K1(1270)的衰变过程后,可以发现,B(D0→K-K1+(1270)(→K*0π+))的实验数据很可能被高估了一个量级。考虑共振态K1(1400)的贡献,利用因子化方法计算相应的衰变过程的分支比,可以发现,B(D0→K-K1+(1400)(→K*0π+))的分支比与使用等式关系得到的B(D0→K-K1+(1270)(→K*0π+))的分支比在量级上是相同的。另外,对于含有奇异轴矢介子的D介子衰变实验数据的合理性,实验可以通过测量K1(1270)→ρK和K*π分支比的比值来检验,或者通过验证D介子衰变中的等式关系来检验。The nature of strange axial-vector mesons are not well understood and can be investigated in D meson decays. In this work, it is found that the experimental data of D0→K±K1■(1270)(→ρK or K*π)in the D0→ K+K-π+π- mode, disagree with the equality relation under the narrow width approximation and CP conservation of strong decays. Considering more other results of K1(1270) decays, the data of B(D0→ K-K1+(1270)(→ K*0π+)) is probably overestimated by one order of magnitude. We then calculate the branching fractions of the corresponding processes with K1(1400) in the factorization approach, and find B(D0→ K-K+1(1400)(→ K*0π+)) is comparable to the predicted B(D0→K-K1+(1270)(→ K*0π+))using the equality relation. Besides, we suggest to measure the ratios between K1(1270)→ρK and K*π or to test the equality relations in other D meson decay modes.

关 键 词：奇异轴矢介子 等式关系 D介子 

分 类 号：O572.243[理学—粒子物理与原子核物理]