$B$ decay anomalies and dark matter from vectorlike confinement

TL;DR

This paper proposes a new composite leptoquark model from strong dynamics to explain B decay anomalies, predicts potential LHC signals, and explores dark matter candidates within this framework.

Contribution

It introduces a novel composite leptoquark model based on hypercolor confinement that addresses B anomalies and includes dark matter candidates, constrained by current experiments.

Findings

Model explains B decay anomalies via composite leptoquarks.

Dark matter candidate S^N may be detectable through magnetic dipole moment.

Potential LHC signals include pair production of leptoquarks and heavy leptons.

Abstract

Lepton flavor universality violating $B\to K\ell\ell$ and $K^*\ell\ell$ decays tentatively observed by LHCb can be explained by leptoquark exchange. We explore a simple model for the $B$ anomalies with a composite leptoquark from new strong dynamics at the TeV scale, a confining SU($N_{\rm HC}$) hypercolor interaction. The new matter fields, fundamentals under SU($N_{\rm HC}$), are heavy vectorlike fermions $\Psi,\, S,$ and an inert scalar doublet $\phi$. $\Psi$ is colored under QCD while $S$ is neutral, and the hyperbaryon $S^N$ is a dark matter candidate. The model is tightly constrained by meson-antimeson oscillations, lepton flavor violation, and LHC searches for resonant production of the exotic bound states. The dark matter may be detectable through its magnetic dipole moment. If $m_S$ is sufficiently small, composite leptoquarks and heavy lepton partners can be pair-produced at an observable level at LHC.