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We analyse a light charged Higgs boson in the 2-Higgs Doublet Model (2HDM)Type-I, when its mass satisfies the condition $M_{H^{\pm}} < M_{t}+M_{b}$ andthe parameter space is consistent with theoretical requirements ofself-consistency as well as the latest experimental constraints from LargeHadron Collider (LHC) and other data. Over such a parameter space, wherein theStandard Model (SM)-like state discovered at the LHC in 2012 is the heaviestCP-even state of the 2HDM, it is found that the decay modes of the chargedHiggs boson are dominated by $H^{\pm} \rightarrow W^{\pm *} h$. Furthermore,the light neutral Higgs boson $h$ dominantly decays into two photons. Underthese conditions, we find that the production and decay process $ p p \to H^\pmh \to {W^\pm}^{(*)} h h \to l \nu_{l} + 4 \gamma$ ($l=e,\mu$) is essentiallybackground free. However, since the $W^{\pm(*)}$ could be largely off-shell andthe $h$ state is very light, so that both the lepton coming from the former andthe photons coming from the latter could be rather soft, we perform here a fullMonte Carlo (MC) analysis at the detector level demonstrating that such a$W^{\pm} + 4\gamma$ signal is very promising, as it would be yieldingsignificant excesses at the LHC with an integrated luminosity of $L=$ 300$fb^{-1}$ at both $\sqrt{s}= 13$ and $14 ~\text{TeV}$.

Analysis of $W^\pm+4\gamma$ in the 2HDM Type-I at the LHC