The Higgs as a portal to Plasmon-like unparticle excitations

A. Delgado, J. R. Espinosa, J. M. No, M. Quirós

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21 Citations (Scopus)


A renormalizable coupling between the Higgs and a scalar unparticle operator U of non-integer dimension d U<2 triggers, after electroweak symmetry breaking, an infrared divergent vacuum expectation value for U. Such IR divergence should be tamed before any phenomenological implications of the Higgs-unparticle interplay can be drawn. In this paper we present a novel mechanism to cure that IR divergence through (scale-invariant) unparticle self-interactions, which has properties qualitatively different from the mechanism considered previously. Besides finding a mass gap in the unparticle continuum we also find an unparticle pole reminiscent of a plasmon resonance. Such unparticle features could be explored experimentally through their mixing with the Higgs boson.
Original languageEnglish
Article number028
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 1 Apr 2008


  • Beyond standard model
  • Higgs physics


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