论文标题
一项关于重蛋白膜的半衰减衰减的全面研究
A comprehensive study on the semileptonic decay of heavy flavor mesons
论文作者
论文摘要
浓烈风味中的半衰减衰变为提取Cabibbo-Kobayashi-Maskawa（CKM）矩阵元素提供了一个干净的环境，该矩阵元素描述了标准模型中CP侵入和风味的过程。编码动态信息的涉及形式是在获得任何结论性陈述中起着至关重要的作用。也就是说，对形式因素的知识应受到良好的控制，要求除分支部分外，还需要检查更多可观察的物品。 In this paper, we provide the mean value and the $q^2$-dependent shape for further observables [differential decay distribution ($dΓ/dq^2$), forward-backward asymmetry ($\mathcal{A}_{FB}^l$), longitudinal ($P_L^l$) and transverse ($P_T^l$) polarization of a charged lepton, longitudinal polarization在最终状态下的矢量梅森（$ f_l^l（v）$），轻质凸态参数（$ c_f^l $）和三角矩（$ w_i^l $）在$ d _ {（s）} $和$ b _ {（s）$ p/$ p/$ p/$ p/$ p/$ p/$ p/$ p/$ p/$ p/$ p/$ p/$（$ w_i^l $）中$τ$）]，基于对协变光模型的相关形式的预测。 $ p $和$ v $分别表示伪库斯卡和矢量梅森。作为比较，我们发现与文献中的协变量Quark模型和相对论夸克模型的结果有很好的共识。正如人们已经观察到的那样，$ p_l^l $和$ f_l^l（v）$是区分各种新物理模型的关键数量，因此这些可观察物的重新检查与其他方法也是必不可少的和必要的。
The semileptonic decay of heavy flavor mesons offers a clean environment for extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, which describes the CP-violating and flavor changing process in the Standard Model. The involved form factors where the dynamical information is encoded play an essential role in achieving any conclusive statement. That is, the knowledge of the form factors should be under good control, requiring one to examine more observables in addition to the branching fraction. In this paper, we provide the mean value and the $q^2$-dependent shape for further observables [differential decay distribution ($dΓ/dq^2$), forward-backward asymmetry ($\mathcal{A}_{FB}^l$), longitudinal ($P_L^l$) and transverse ($P_T^l$) polarization of a charged lepton, longitudinal polarization of a vector meson in the final state ($F_L^l(V)$), leptonic convexity parameter ($C_F^l$), and trigonometric moments ($W_i^l$) in the decay of $D_{(s)}$ and $B_{(s)}$ to $P/V l^+ ν_l$ ($l=e$, $μ$ or $τ$)], based on the predictions of the relevant form factors from the covariant light-front quark model. $P$ and $V$ denote the pseudoscalar and vector meson, respectively. As a comparison, we find a good agreement with the results from the covariant confining quark model and the relativistic quark model in the literature. As it has been observed that the $P_L^l$ and $F_L^l(V)$ are crucial quantities to discriminate various New Physics models, the reexamination of these observables from a different method is also essential and necessary.
