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In this paper, the question of observability of a heavy charged Higgs in themass range 400 GeV < mH < 1000 GeV, is addressed. The production process is setto pp -> H+ -> tb at 14 TeV LHC. The analysis benefits from top taggingtechnique which is based on finding a fat jet as a result of the boosted topquark decay in signal events. A detailed hadron level analysis is performed andselection efficiencies are presented with different charged Higgs masshypotheses. Finally running toy experiments and using pseudo-data, a fit oversignal plus background distributions is performed to assess possibility ofreconstructing the charged Higgs peak and its invariant mass measurement. It isshown that the charged Higgs mass can well be reconstructed in the mass range500 GeV to 1 TeV, with a signal significance which depends on tanbeta.Eventually 5sigma discovery and 95% C.L. exclusion contours are also provided.

Observability of s-channel Heavy Charged Higgs at LHC Using Top Tagging Technique