Discriminating between Higgs Boson models using e(sup +)e(sup -) (yields) tt-bar h and Zh at the NLC

摘要

In extensions of the Standard Model (SM) there are multiple neutral Higgs bosons. Their masses and couplings are often dependent upon many parameters; CP-violating mixing of CP-even with CP-odd neutral Higgs fields is generally possible. It is demonstrated that the process e(sup +)e(sup -) (yields) tt-bar h at the NLC provides a powerful tool for extracting the tt-bar (Yukawa) couplings of the h. In combination with the e(sup +)e(sup -) (yields) Zh process, an accurate determination of the ZZ coupling of the H is also possible. The resulting ability to distinguish different models of the Higgs sector is illustrated by detailed studies for two-Higgs-doublet models, for which the masses and couplings of the three neutral Higgs bosons are all free parameters. It is concluded that it is very possible that the SM is not correct. In this case, and if there is a weakly-coupled Higgs sector, there will certainly be Higgs bosons that do not have SM-like couplings. 3 refs., 3 figs. (Atomindex citation 28:038917)