Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-11-06
Phys. Rev. D81 103524 (2010)
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 4 figures. Uses iopart.cls and feynmf.sty. v2: Text revised, but conclusions unchanged. v3: Replaced with version ac
Scientific paper
10.1103/PhysRevD.81.103524
In this paper we study various particle physics effects of a light, scalar dark energy field with chameleon-like couplings to matter. We show that a chameleon model with only matter couplings will induce a coupling to photons. In doing so, we derive the first microphysical realization of a chameleonic dark energy model coupled to the electromagnetic field strength. This analysis provides additional motivation for current and near-future tests of axion-like and chameleon particles. We find a new bound on the coupling strength of chameleons in uniformly coupled models. We also study the effect of chameleon fields on Higgs production, which is relevant for hadron colliders. These are expected to manufacture Higgs particles through weak boson fusion, or associated production with a Z or W. We show that, like the Tevatron, the LHC will not be able to rule out or observe chameleons through this mechanism, because gauge invariance of the low energy Lagrangian suppresses the corrections that may arise.
Brax Philippe
Burrage Clare
Davis Anne--Christine
Seery David
Weltman Amanda
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