Detecting heavy charged Higgs bosons at the LHC with triple b-tagging

We investigate the charged Higgs boson signal at the LHC using its dominant production and decay modes with triple b-tagging, i.e. tH−→tt̄b→bb̄bW+W−, followed by leptonic decay of one W and hadronic decay of the other. We consider the continuum background from the associated production of tt̄ with a b- or a light quark or gluon jet, which can be mis-tagged as b-jet. We reconstruct the top quark masses to identify the 3rd b-jet accompanying the tt̄ pair, and use its pT distribution to distinguish the signal from the background. Combining this with the reconstruction of the H± mass gives a viable signature over two interesting regions of the parameter space – i.e. tanβ∼1 and ∼mt/mb.