Reappraisal of the wrong-sign hbb coupling and the study of h → Zy.

It has been pointed out recently that current experiments still allow for a two Higgs doublet model where the hbb coupling (kDmb/v) is negative; a sign opposite to that of the Standard Model. Due to the importance of delayed decoupling in the hH+H- coupling, h → yy improved measurements will have a strong impact on this issue. For the same reason, measurements or even bounds on h → Zy are potentially interesting. In this article, we revisit this problem, highlighting the crucial importance of h → VV, which can be understood with simple arguments. We show that the impacts on kD < 0 models of both h → bb and h → τ+τ- are very sensitive to input values for the gluon fusion production mechanism; in contrast, h → yy and h → Zy are not. We also inquire if the search for h → Zy and its interplay with h → yy will impact the sign of the hbb coupling. Finally, we study these issues in the context of the flipped two Higgs doublet model. [ABSTRACT FROM AUTHOR]