Search for the vectorlike leptons in the U(1)$_X$ model inspired by the $B$-meson decay anomalies

TL;DR

This paper investigates the U(1)$_X$ model with vectorlike leptons as a solution to B-meson decay anomalies, proposing collider searches for leptons up to 1000 GeV at the LHC.

Contribution

It introduces a detailed collider analysis for vectorlike leptons in the U(1)$_X$ model, highlighting their detectability as a complement to Z' searches.

Findings

Vectorlike leptons up to 1000 GeV can be tested at the future LHC.

The model explains B-meson decay anomalies with flavor-violating couplings.

Bounds on gauge boson and lepton masses are established.

Abstract

We consider the U(1)$_X$ model, which can induce the flavor violating couplings through vectorlike fermions and address the observed rare $B$-meson decay anomalies. To be consistent with all the other observations, both the associated gauge boson mass and the vectorlike lepton mass are bounded from above. We argue that the search for new vectorlike leptons is promising and provides a complement to the $Z'$ search. A detailed collider analysis shows that the model with the vectorlike lepton mass up to 1000 GeV could be tested at the future LHC.