Abstract
We explore a scenario in the Standard Model in which dimension-four Yukawa couplings are forbidden by a symmetry, and the Yukawa interactions are dominated by effective dimension-six interactions. In this case, the Higgs interactions to the fermions are enhanced in a large way, whereas its interaction with the gauge bosons remains the same as in the Standard Model. In hadron colliders, Higgs boson production via gluon–gluon fusion increases by a factor of nine. Higgs decay widths to fermion–antifermion pairs also increase by the same factor, whereas the decay widths to photon–photon and γZ are reduced. Current Tevatron exclusion range for the Higgs mass increases to ∼146–222 GeV in our scenario, and new physics must appear at a scale below a TeV.
Highlights
We explore a scenario in the Standard Model in which dimension four Yukawa couplings are either forbidden by a symmetry, or happen to be very tiny, and the Yukawa interactions are dominated by effective dimension six interactions
The Standard Model (SM) based on the gauge symmetry SU (3)C × SU (2)L × U (1)Y is in excellent agreement with all the current experimental results
The cubic (h3) and the quartic (h4) interactions of the remaining neutral scalar Higgs field, h is determined in terms of the Higgs mass, Mh and the known vacuum expectation value (VEV), v
Summary
In the low Higgs mass range (Mh ≤ 125 GeV), the Higgs boson dominantly decays to bb in the SM. This mode is even more dominant in the new model, since the hbb coupling is enhanced by a factor of three compared to the SM. Note that in our model, Higgs couplings to the gauge bosons W W and ZZ are unaltered, these branching ratios get suppressed compared to the SM as long as hbb is dominant. For heavy Higgs mass range, Mh ≥ 155 GeV, the W W mode starts to dominate, and the branching ratio to this mode is very similar to the SM.
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