2012/03/31 by A. G. Akeroyd, J. Hernandez-Sanchez, S. Moretti · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.85.115002
19 pages, 13 figures. v2: section IIIB expanded, one figure and references added, version to appear in Physical Review D
arxiv created 2012/05/10 · arxiv updated 2013/05/29
Searches for light charged Higgs bosons (H^±) in the decay of top quarks, t -> H^± b, are being carried out at the LHC and at the Tevatron. It is assumed that the dominant decay channels for such an H^± state are either H^± -> τνor H^± -> cs, and separate searches are performed with comparable sensitivity to the parameters mH^± and tanbeta of the scalar potential. The branching ratio for the decay H^± -> cb can be as large as 80% in the Aligned Two Higgs Doublet Model and in models with three or more Higgs doublets with natural flavour conservation, while satisfying the constraint from b -> s gamma for mH^± < mt. Although the current search strategy for H^± -> cs is also sensitive to H^± -> cb, a considerable gain in sensitivity could be obtained by tagging the b quark from the decay H^± -> cb. Such an analysis, which could be readily performed at the Tevatron and in the 7 TeV and 8 TeV runs of the LHC, would probe a parameter space of the fermionic couplings of H^± in the above models which at present cannot be probed by experimental observables in flavour physics.