11,388 research outputs found
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
Neutrino Mass Generation at TeV Scale and New Physics Signatures from Charged Higgs at the LHC for Photon Initiated Processes
We consider the collider phenomenology of a simple extension of the Standard
Model (SM), which consists of an EW isospin scalar, and a pair
of EW isospin vector like fermions, and ,
responsible for generating tiny neutrino mass via the effective dimension seven
operator. This scalar quadruplet with hypercharge Y = 3 has a plethora of
implications at the collider experiments. Its signatures at TeV scale colliders
are expected to be seen, if the quadruplet masses are not too far above the
electroweak symmetry breaking scale. In this article, we study the
phenomenology of multi-charged quadruplet scalars. In particular, we study the
multi-lepton signatures at the Large Hadron Collider (LHC) experiment, arising
from the production and decays of triply and doubly charged scalars. We studied
Drell-Yan (DY) pair production as well as pair production of the charged
scalars via photon-photon fusion. For doubly and triply charged scalars, photon
fusion contributes significantly for large scalar masses. We also studied LHC
constraints on the masses of doubly charged scalars in this model. We derive a
lower mass limit of 725 GeV on doubly charged quadruplet scalar.Comment: 31 pages, 22 figures, published version in JHE
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