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We analyze a new signature of a charged Higgs boson in the Type-I realizationof the 2-Higgs Doublet Model (2HDM), where the mass of the charged Higgs bosonsatisfies the condition $M_{H^{\pm}}<M_{t}+M_{b}$ and the theoretical parameterspace is consistent with the latest experimental constraints from Large HadronCollider (LHC) and other direct as well as indirect searches. In the survivingregions, it is found that the bosonic decay mode of a charged Higgs boson isdominated by $H^{\pm} \rightarrow W^{\pm*}h$. At the same time, the lightneutral Higgs boson $h$ dominantly decays into two photons. We thus find thatthe production process $pp \rightarrow H^{\pm}h \rightarrow W^{\pm*}h h\rightarrow l^{\pm}\nu +4\gamma$ is almost background free. Since the $W^{\pm}$could be either off-shell or on-shell, furthering a previous phenomenologicalanalysis, we examine closely detector effects onto the above signature anddemonstrate that it is indeed promising to study it at the LHC with both$\sqrt{s}= 13$ TeV and $\sqrt{s} = 14$ TeV, assuming an integrated luminosityof 300 $fb^{-1}$.

Searching for $H^\pm\to W^{\pm} + 4\gamma$ signals in the 2HDM Type-I at the LHC