Dark matter in Hidden Valley models with stable and unstable light dark mesons

Hugues Beauchesne, Enrico Bertuzzo, Giovanni Grilli di Cortona

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

It is a distinct possibility that a Hidden Valley sector would have a spectrum of light particles consisting of both stable and unstable dark mesons. The simultaneous presence of these two types of particles can lead to novel mechanisms for generating the correct dark matter relic abundance, which in turn can reflect themselves into new exotic signatures at colliders. We study the viability of such sectors for various Hidden Valley models and map the valid parameter space to possible collider signatures. Mediators studied include various scalar bifundamentals and a heavy Z′. It is shown that in general bounds from direct and indirect detection can easily be avoided. In most of the allowed parameter space, the relic density is determined by stable mesons annihilating to unstable ones which in turn decay quickly to Standard Model particles. Dark mesons that decay mainly to heavier Standard Model fermions allow for more valid parameter space, though dark mesons are still allowed to decay exclusively to some of the lighter fermions. Possible exotic collider signatures include displaced vertices, emerging jets and semivisible jets.

Original languageEnglish
Article number118
JournalJournal of High Energy Physics
Volume2019
Issue number4
DOIs
StatePublished - 1 Apr 2019

Keywords

  • Beyond Standard Model
  • Cosmology of Theories beyond the SM

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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