# LHC *τ* -rich tests of lepton-specific 2HDM for (*g* − 2)_{ μ }

## Abstract

The lepton-sepcific (or type X) 2HDM (L2HDM) is an attractive new physics candidate explaining the muon *g* − 2 anomaly requiring a light CP-odd boson *A* and large tan β. This scenario leads to τ -rich signatures, such as 3*τ* , 4*τ* and 4*τ* + *W/Z*, which can be readily accessible at the LHC. We first study the whole L2HDM parameter space to identify allowed regions of extra Higgs boson masses as well as two couplings λ_{ hAA } and *ξ* _{ h } ^{ l } which determine the 125 GeV Higgs boson decays *h* → *τ* ^{+} *τ* ^{−} and *h* → *AA/AA* ^{∗}(*τ* ^{+} *τ* ^{−}), respectively. This motivates us to set up two regions of interest: (A) *m* _{ A } ≪ *m* _{ H } ∼ *m* _{ H }± , and (B) *m* _{ A } ∼ *m* _{ H }± ∼ \( \mathcal{O} \)(100)GeV ≪ *m* _{ H } , for which derive the current constraints by adopting the chargino-neutralino search at the LHC8, and then analyze the LHC14 prospects by implementing *τ* -tagging algorithm. A correlated study of the upcoming precision determination of the 125 GeV Higgs boson decay properties as well as the observation of multi-tau events at the next runs of LHC will be able to shed light on the L2HDM option for the muon *g* − 2.

## Keywords

Phenomenological Models Hadronic Colliders## Notes

**Open Access**

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