5,081 research outputs found
Complementarity of LHC and EDMs for Exploring Higgs CP Violation
We analyze the constraints on a CP-violating, flavor conserving, two Higgs
doublet model from the measurements of Higgs properties and from the search for
heavy Higgs bosons at LHC, and show that the stronger limits typically come
from the heavy Higgs search channels. The limits on CP violation arising from
the Higgs sector measurements are complementary to those from EDM measurements.
Combining all current constraints from low energy to colliders, we set generic
upper bounds on the CP violating angle which parametrizes the CP odd component
in the 126 GeV Higgs boson.Comment: 34 pages, 17 figures, 2 tables; references added, constraints from
Higgs decay into tau updated, version accepted for publication in JHE
Electroweak Effective Operators and Higgs Physics
We derive bounds from oblique parameters on the dimension-6 operators of an
effective field theory of electroweak gauge bosons and the Higgs doublet. The
loop- induced contributions to the S, T, and U oblique parameters are sensitive
to these contributions and we pay particular attention to the role of
renormalization when computing loop corrections in the effective theory. Limits
on the coefficients of the effective theory from loop contributions to oblique
parameters yield complementary information to direct Higgs production
measurements.Comment: 33 pages, 6 figures; additional scalar operator included and
references adde
Consequences of Approximate Symmetry of the Neutrino Mass Matrix
Assuming that the neutrino mass matrix is dominated by a term with the
permutation symmetry it is possible to explain
neutrino data only if the masses are quasi-degenerate. A sub-dominant term with
an approximate symmetry leads to an approximate tri-bimaximal form.
Experimental consequences are discussed.Comment: 7 pages, 2 figures, 1 table, RevTe
Higgs CP Violation from Vectorlike Quarks
We explore CP violating aspects in the Higgs sector of models where new
vectorlike quarks carry Yukawa couplings mainly to the third generation quarks
of the Standard Model. We point out that in the simplest model, Higgs CP
violating interactions only exist in the hWW channel. At low energy, we find
that rare B decays can place similarly strong constraints as those from
electric dipole moments on the source of CP violation. These observations offer
a new handle to discriminate from other Higgs CP violating scenarios such as
scalar sector extensions of the Standard Model, and imply an interesting future
interplay among limits from different experiments.Comment: 19 pages, 5 figure
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