94 research outputs found
h \gamma \gamma Coupling in Higgs Triplet Model
We investigate Higgs boson decay into two photons in the type-II seesaw
model. The rate of gets suppressed/enhanced in this model
compared to the Standard Model (SM) due to the presence of the singly and
doubly charged Higgs and .Comment: Latex, 7 pages, 2 Figures. The 2011 International Workshop on Future
Linear Colliders (LCWS11), Granada, Spai
The Higgs Potential in the Type II Seesaw Model
We perform in the type II seesaw setting, a detailed study of the dynamical
features of the corresponding general renormalizable doublet/triplet Higgs
potential that depends on five dimensionless couplings and two mass parameters
after spontaneous symmetry breaking, and highlight the implications for the
Higgs phenomenology. In particular, we determine i) the complete set of
tree-level unitarity constraints on the couplings of the potential and ii) the
exact tree-level {\sl all directions} boundedness from below constraints on
these couplings. When combined, these constraints delineate precisely the
theoretically allowed parameter space domain within our perturbative
approximation. Among the seven physical Higgs states of this model, the mass of
the lighter (heavier) CP-even state h0 (H0) will always satisfy a theoretical
upper (lower) bound that is reached for a critical value mu_c of mu (the mass
parameter controlling triple couplings among the doublet/triplet Higgses).
Saturating the unitarity bounds we find m_h0 < {\cal O}(0.7 - 1 TeV), while the
upper bound for the remaining Higgses lies in the several tens of TeV. However,
the actual masses can be much lighter. We identify two regimes corresponding to
mu > mu_c and mu < mu_c. In the first regime the Higgs sector is typically very
heavy and only h0 that becomes SM-like could be accessible to the LHC. In
contrast, in the second regime, somewhat overlooked in the literature, most of
the Higgs sector is light. In particular the heaviest state H0 becomes SM-like,
the lighter states being the CP-odd Higgs, the (doubly) charged Higgses and a
decoupled h0, possibly leading to a distinctive phenomenology at the colliders.Comment: 55 pages, 9 figures, no major changes, references added, a comment
added to sec 3.1, typos correcte
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