Abstract
New physics scenarios beyond the Standard Model predict the existence of milli-charged particles. So far, only spin-1/2 and spin-0 milli-charged particles have been considered in literature, leaving out the interesting case of spin-1. We propose a minimal unitary and renormalizable model of massive milli-charged vector particles. Unitarity requires that these particles are gauge bosons of a non-abelian spontaneously broken gauge symmetry. The minimal scenario then consists of an extended Standard Model gauge group SU(2) L × U(1) Y × SU(2) D together with a SU(2) D dark Higgs boson responsible for the symmetry breaking in the dark sector. By imposing that the dark Higgs multiplet has a non-vanishing milli-hypercharge, stable milli-charged spin-1 fields arise thereby providing a potential dark matter candidate. We analyse the phenomenological constraints on this scenario and discuss their implications.
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Gabrielli, E., Marzola, L., Raidal, M. et al. Dark matter and spin-1 milli-charged particles. J. High Energ. Phys. 2015, 150 (2015). https://doi.org/10.1007/JHEP08(2015)150
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DOI: https://doi.org/10.1007/JHEP08(2015)150