Associated charged Higgs and W boson production in the MSSM at the CERN large hadron collider

We investigate the viability of observing charged Higgs bosons ( H± ) produced in association with W bosons at the CERN large hadron collider, using the leptonic decay H⁺ → + ν τ and hadronic W decay, within different scenarios of the minimal supersymmetric standard model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible standard model background from W+2 jets can be controlled by applying appropriate cuts and find that the size of a possible signal depends on the cuts needed to suppress QCD backgrounds and misidentifications. In the standard maximal mixing scenario of the MSSM we find a viable signal for large tan β and intermediate H ± masses ( ∼ mt ) when using softer cuts ( p_⊥, p_τjet > ∈50 GeV), whereas for harder cuts ( p_⊥, p_⊥ τ jet> 100 GeV) we only find a viable signal for very large tan β (). We have also investigated a special class of MSSM scenarios with large mass splittings among the heavy Higgs bosons where the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the CP -violating phases. Even so we find that the signal after cuts remains small except for small masses ( {} m_t) when using the softer cuts. Finally, in all the scenarios we have investigated we have only found small CP -asymmetries.