论文标题
辐射三体D-Meson衰减在标准模型中
Radiative three-body D-meson decays in and beyond the standard model
论文作者
论文摘要
我们研究辐射魅力衰减$ d \ to p_1 p_1p_2γ$，$ p_ {1,2} =π，k $在QCD上的QCD分解，并在重命令中和重力强子手性扰动理论中。 Branching ratios including resonance contributions are around $\sim 10^{-3}$ for the Cabibbo-favored modes into $K πγ$ and $\sim 10^{-5}$ for the singly Cabibbo-suppressed modes into $π^+ π^- γ, K^+ K^- γ$, and thus in reach of the flavor factories BES III and Belle II. Dalitz图和前后不对称的揭示了两个QCD框架之间的显着差异。因此，这种可观察物非常适合于数据驱动的标准模型中相关衰减机制的识别，以$ d \ tokπγ$衰减为主导。这增加了用$ d \ toπ^+π^ - γ$和$ d \探测新物理的潜力，到k^+ k^ - γ$衰变，这对增强的偶极子操作员敏感。 CP不对称可用于测试SM，并在中性$ |ΔC| = 1 $转换中寻找新物理。由于存在$ s $ - 和$ t，u $ - 通道中间共振，因此达利兹（Dalitz）的削减增强了对新物理学的敏感性。
We study radiative charm decays $D \to P_1 P_2 γ$, $P_{1,2}=π,K$ in QCD factorization at leading order and within heavy hadron chiral perturbation theory. Branching ratios including resonance contributions are around $\sim 10^{-3}$ for the Cabibbo-favored modes into $K πγ$ and $\sim 10^{-5}$ for the singly Cabibbo-suppressed modes into $π^+ π^- γ, K^+ K^- γ$, and thus in reach of the flavor factories BES III and Belle II. Dalitz plots and forward-backward asymmetries reveal significant differences between the two QCD frameworks; such observables are therefore ideally suited for a data-driven identification of relevant decay mechanisms in the standard-model dominated $D \to K πγ$ decays. This increases the potential to probe new physics with the $D \to π^+ π^- γ$ and $D \to K^+ K^- γ$ decays, which are sensitive to enhanced dipole operators. CP asymmetries are useful to test the SM and look for new physics in neutral $|ΔC|=1$ transitions. Cuts in the Dalitz plot enhance the sensitivity to new physics due to the presence of both $s$- and $t,u$-channel intermediate resonances.
