D介子衰变中的奇异轴矢介子(英文)

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。

Strange Axial-vector Mesons in D Meson Decays

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-K₁+(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.