Sonia El Hedri
Abstract: We study the naturalness problem using a model independent bottom up approach by considering
models where only the interaction terms needed to cancel the Higgs quadratic divergences are present.
If quadratic divergences are canceled by terms linear in the Higgs field, then the collider phenomenology
is well covered by current electroweakino and fourth generation searches. If quadratic divergences
are canceled by terms bilinear in the Higgs field, then the signatures are highly dependent on the
quantum numbers of the new particles. Precision Higgs measurements can reveal the presence of
new particles with either vevs or Standard Model charges. If the new particles are scalar dark matter
candidates, their direct and indirect detection signatures will be highly correlated and within the reach
of XENON100 and Fermi. Observation at one of these experiments would imply observation at the
other one. Observable LHC decay channels can also arise if the new particles mix with lighter states.
This decay channel involves only the Higgs boson and not the gauge bosons. Observation of such
decays would give evidence that the new particle is tied to the naturalness problem.
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