Scalar leptoquark and vector-like quark extended models as the explanation of the muon $g-2$ anomaly: bottom partner chiral enhancement case

Abstract

Leptoquark (LQ) models are well motivated solutions to the $(g-2{)}_{\mu }$ anomaly. In the minimal LQ models, only specific representations can lead to the chiral enhancements. For the scalar LQs, the $R_2$ and $S_1$ can lead to the top quark chiral enhancement. For the vector LQs, the $V_2$ and $U_1$ can lead to the bottom quark chiral enhancement. When we consider the LQ and vector-like quark (VLQ) simultaneously, there can be more scenarios. In our previous work, we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement. Here, we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement. We find two new models with $B$ quark chiral enhancement, which originate from the bottom and bottom partner mixing. Then, we propose new LQ and VLQ search channels under the constraints of $(g-2{)}_{\mu }$.

Comments: 17 pages, 2 captioned figures, 4 tables. Sequel to the paper arXiv:2112.13490 [hep-ph]. Add figures to show the $(g-2{)}_{\mu }$ allowed regions in the plane of $m_B-m_{\mathrm{LQ}}$. References added. Typos corrected. Presentation improved. Match the published version in Chinese Physics C