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arXiv 1504.06346hep-phhep-ex
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$D^+ \to K^- π^+ π^+$ -弱矢量流

$D^+ \to K^- π^+ π^+$ - the weak vector current

P. C. Magalhães, M. R. Robilotta

摘要:

在过去的15年里,D和B介子衰变为强子的研究一直被用来检验标准模型。一个重介子衰变涉及到一个主要的弱顶点和随后的强子末态相互作用的综合影响,这决定了Dalitz图的形状。最终产物涉及轻介子的事实表明,QCD真空是问题的一个活跃部分。这使得这些过程的描述相当复杂,尽管其重要性,现象学分析往往依赖于粗糙的模型。不久前,我们的研究小组对衰变$D^+ \to K^- π^+ π^+$进行了示意性计算,对数据进行了合理的描述。它的主要假设是弱矢量流占主导地位,这产生了不可因式分解的相互作用。在这里,我们完善的计算,包括正确的动量依赖的弱顶点和扩展的能量范围的$ππ$和$Kπ$子振幅的问题。这些新的特点使目前的治疗更现实,使理论更接近数据。

英文摘要:

Studies of D and B mesons decays into hadrons have been used to test the standard model in the last fifteen years. A heavy meson decay involves the combined effects of a primary weak vertex and subsequent hadronic final state interactions, which determine the shapes of Dalitz plots. The fact that final products involve light mesons indicates that the QCD vacuum is an active part of the problem. This makes the description of these processes rather involved and, in spite of its importance, phenomenological analyses tend to rely on crude models. Our group produced, some time ago, a schematic calculation of the decay $D^+ \to K^- π^+ π^+$, which provided a reasonable description of data. Its main assumption was the dominance of the weak vector-current, which yields a non-factorizable interaction. Here we refine that calculation by including the correct momentum dependence of the weak vertex and extending the energy ranges of $ππ$ and $Kπ$ subamplitudes present into the problem. These new features make the present treatment more realistic and bring theory closer to data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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