Searching for heavy charged Higgs bosons in the neutrino–tau decay mode at LHC

We discuss the search for the heavy charged Higgs bosons H, implicitly of the Minimal Supersymmetric Standard Model, in the τν decay mode at the LHC. Compared to the dominant decay mode H → bt, the channel suffers from suppression due to the branching ratio and the lack of direct mass reconstruction, but the reduced Qcd background makes it a feasible channel especially in the large tan β region. We study the production in ‘bt fusion’ via bg → tH, and the leading irreducible background bg → tW. Our results indicate that for the H mass of greater than 200 GeV and up to 1 TeV and higher, they can be discovered in this channel for a vast range of the parameter space, down to at least tan β ∼ 3 and potentially the whole range of tan β down to 1.5 if the signal selection efficiency could be improved fourfold. Our analysis is sensitive to top quark identification at large rapidity, and should be supplemented with a full study including jet showering and detector effects.