arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1811.04496hep-ph
收藏

右手电流的$R(D^*,D)$反常理论

A Theory of $R(D^*,D)$ Anomaly With Right-Handed Currents

K. S. Babu, Bhaskar Dutta, Rabindra N. Mohapatra

备注：
43 pages, 7 figures, references added, model slightly modified
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

本文利用一类左右对称模型的低质量$W_R^\pm$规范玻色子给出了$R(D^*)$和$R(D)$反常的紫外完备理论。这些模型基于规范对称性$SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$，利用类矢量费米子通过通用的跷跷板机制产生夸克和轻子质量。奇偶对称版本以及非对称版本进行了研究。一个轻的无菌中微子自然地出现在这个设置中，这允许通过右手电流的$B$介子的新衰变模式。我们发现这些模型可以解释$R(D^*)$和$R(D)$异常，同时与LHC和LEP数据以及由$K_L-K_S, B_{d,s}-\bar{B}_{d,s}$，$D-\bar{D}$混合等引起的低能味约束一致，但仅用于有限范围的$W_R$质量：$1.2\, (1.8)~{\rm TeV} \leq M_{W_R}\leq 3~ {\rm TeV}$用于奇偶不对称（对称）Yukawa扇区。该模型预测的轻不育中微子可能与解释MiniBoone和LSND中微子振荡结果有关。宇称对称版本的模型提供了一个简单的解决方案，强CP问题，而不依赖于轴子。它还预测了一个质量为$M_T = (1.5-2.5)$ TeV的同位旋单重态顶部伙伴。

英文摘要：

We present an ultraviolet complete theory for the $R(D^*)$ and $R(D)$ anomaly in terms of a low mass $W_R^\pm$ gauge boson of a class of left-right symmetric models. These models, which are based on the gauge symmetry $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$, utilize vector-like fermions to generate quark and lepton masses via a universal seesaw mechanism. A parity symmetric version as well as an asymmetric version are studied. A light sterile neutrino emerges naturally in this setup, which allows for new decay modes of $B$-meson via right-handed currents. We show that these models can explain $R(D^*)$ and $R(D)$ anomaly while being consistent with LHC and LEP data as well as low energy flavor constraints arising from $K_L-K_S, B_{d,s}-\bar{B}_{d,s}$, $D-\bar{D}$ mixing, etc., but only for a limited range of the $W_R$ mass: $1.2\, (1.8)~{\rm TeV} \leq M_{W_R}\leq 3~ {\rm TeV}$ for parity asymmetric (symmetric) Yukawa sectors. The light sterile neutrinos predicted by the model may be relevant for explaining the MiniBoone and LSND neutrino oscillation results. The parity symmetric version of the model provides a simple solution to the strong CP problem without relying on the axion. It also predicts an isospin singlet top partner with a mass $M_T = (1.5-2.5)$ TeV.

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。

↑