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Enhanced Di-Higgs Production in the Two Higgs Doublet Model
We show that the rate for di-Higgs production at the LHC can be enhanced by a
factor as large as 25 compared to the Standard Model value in the two Higgs
doublet model while being consistent with the known properties of the observed
Higgs boson . There are correlated modifications in and
resonant production rates, which can serve as tests of this model. Our
framework treats both Higgs doublets on equal footing, each with comparable
Yukawa couplings to fermions. The Cheng-Sher ansatz for multi-Higgs doublet
model is shown to be strongly disfavored by current experiments. We propose a
new ansatz for the Yukawa couplings of the Higgs doublets is proposed,
where , with
being order one coefficients, the mass of fermion and
the electroweak vacuum expectation value. Such a pattern of couplings can
explain the observed features of fermion masses and mixings and satisfies all
flavor violation constraints arising from the exchange of neutral Higgs bosons.
The rate for decay and new contributions to CP
violation in mixing are predicted to be close to the
experimental limits.Comment: 47 pages, 15 figures, published version in JHE
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