The Light Radion Window

Abstract

Inspired by the Contino-Pomarol-Rattazzi mechanism we explore scenarios with a very light (100 keV to 10 GeV) radion which could be associated with the suppression of the electroweak contribution to vacuum energy. We construct explicit, realistic models that realize this mechanism and explore the phenomenological constraints on this class of models. Compared with axion-like particles in this mass range, the bounds from SN 1987a and from cosmology can be much weaker, depending on the the mass of the radion and its coupling to other particles. With couplings suppressed by a scale lower than 100 TeV much of the mass window from 100 keV to 10 GeV is still open.

30 pages, 12 figures, published version, software for figure uploaded

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Cited by in corpus (9)

• Holographic models of composite Higgs in the Veneziano limit. Part I. Bosonic sector
• Avoided Deconfinement in Randall-Sundrum Models
• A light dilaton at the LHC
• Spin-2 KK Mode Scattering in Models with a Massive Radion
• Constraints on CP-odd ALP couplings from EDM limits of fermions
• Dilaton at the LHC: Complementary Probe of Composite Higgs
• Light Dilaton in Rare Meson Decays and Extraction of its CP Property
• Radion-Activated Higgs Mechanism
• A new way of calculating the effective potential for a light radion