论文标题
$ d^0 \至k^-π^+η$反应的理论研究
Theoretical study of the $D^0 \to K^- π^+ η$ reaction
论文作者
论文摘要
我们开发了一个模型来研究$ d^0 \至k^ - π^+η$弱衰变，从偏爱的外部发射和夸克级别的cabibbo偏爱模式开始。还研究了较少的内部排放衰减模式，作为小校正的来源。允许一些夸克对产生两个伪级介子的夸克化，后部可以相互作用以最终提供$ k^-π^+η$状态。手性统一方法用于考虑到介子对的最终状态相互作用，因此，它具有$κ$（$ k^*_ 0（700）$）和$ a_0（980）$共振的产生，在不变质量分布中非常可见。我们还以现象学的方式介绍了$ \ bar {k}^{*0}η$生产，并表明$ s $ - 波型伪内分镜的相互作用以及此向量激发模式足以提供实验数据的公平再现。与数据的协议，尤其是$ a_0（980）$与$κ$激发的相对权重，为所使用的图片提供了额外的支持，其中这两种共振是伪cal膜相互作用的结果，而不是普通$ q \ bar {q} $ mesons的相互作用。
We develop a model to study the $D^0 \to K^- π^+ η$ weak decay, starting with the color favored external emission and Cabibbo favored mode at the quark level. A less favored internal emission decay mode is also studied as a source of small corrections. Some pairs of quarks are allowed to hadronize producing two pseudoscalar mesons, which posteriorly are allowed to interact to finally provide the $K^- π^+ η$ state. The chiral unitary approach is used to take into account the final state interaction of pairs of mesons, which has as a consequence the production of the $κ$ ($K^*_0(700)$) and the $a_0(980)$ resonances, very well visible in the invariant mass distributions. We also introduce the $\bar{K}^{*0} η$ production in a phenomenological way and show that the $s$-wave pseudoscalar interaction together with this vector excitation mode are sufficient to provide a fair reproduction of the experimental data. The agreement with the data, in particular the relative weight of the $a_0(980)$ to the $κ$ excitation, provides extra support to the picture used, in which these two resonances are a consequence of the interaction of pseudoscalar mesons and not ordinary $q \bar{q}$ mesons.
