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Most of the experimental searches of the non-Standard Model Higgs boson(s) atthe LHC rely on the QCD induced production modes. However, in some beyondStandard Model frameworks, the additional Higgs bosons can have fermiophobicbehaviour. The type I two Higgs doublet model considered here is a perfectexample where all the additional Higgs bosons exhibit fermiophobic nature overa large region of parameter space. Thus the electroweak productions of thesenew Higgs bosons are more dominant over the QCD induced processes. In scenarioswith light pseuodoscalar ($A$) which is bound to decay dominantly to$b\bar{b}$, even being fermiophobic, the $4b + W$ state via $p p \to H^\pm A\to (AW)A \to 4b + W$ and followed by the leptonic decay of $W$ boson cansurpass the QCD initiated $4b$ final state. However, the signal getsovershadowed by large $t\bar{t}+$jets background and hence constructing asuitable discriminator based on the signal hypothesis and signal topology isnecessary. We devised a $\chi^2$ variable as the most suitablesignal-background discrimintor to reduce the background by a sizable amount andshowed the discovery reach ( $>3\sigma$) of the electroweak initiated $4b+ \ell+ {\rlap{\,/}{E}_T}$ final state at the LHC.

Probing the electroweak $4b + \ell + {\rlap{\,/}{E}_T}$ final state in type I 2HDM at the LHC