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Bottom-up Naturalness

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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.