Abstract
We introduce the gluequark Dark Matter candidate, an accidentally stable bound state made of adjoint fermions and gluons from a new confining gauge force. Such scenario displays an unusual cosmological history where perturbative freeze-out is followed by a non-perturbative re-annihilation period with possible entropy injection. When the gluequark has electroweak quantum numbers, the critical density is obtained for masses as large as PeV. Independently of its mass, the size of the gluequark is determined by the confinement scale of the theory, leading at low energies to annihilation rates and elastic cross sections which are large for particle physics standards and potentially observable in indirect detection experiments.
Highlights
Arise accidentally in the infrared and explain in the most economical way baryon and lepton number conservation, flavour and electroweak (EW) precision tests
In this work we continued the systematic study of gauge theories with fermions in real or vector-like representations, initiated in ref. [1], where a Dark Matter (DM) candidate arises as an accidentally stable bound state of the new dynamics
We considered in detail the gluequark DM candidate, a bound state of adjoint fermions with a cloud of gluons, stable due to dark fermion number
Summary
We consider the scenario in which the SM is extended by a new confining gauge group. GDC (dark colour ), and by a multiplet of Weyl fermions Q (dark quarks) transforming in the adjoint representation of GDC and as a (possibly reducible) representation R under the SM group GSM:. Since we assumed the dark quarks to transform as real or vectorlike representations under the SM gauge group, the fermion condensate responsible for the global symmetry breaking in the dark sector can be aligned along an ( SUp2qL Up1qY )-preserving direction (in non-minimal models, Yukawa interactions can generate a vacuum misalignment leading to Higgs partial compositeness, see [28, 29]). Besides the NGBs, the physical spectrum comprises additional bound states with mass of order ΛDC These include the gluequarks, which are expected to be the lightest states with odd dark parity, and mesons (i.e. bound states made of more than one dark quark).. For a discussion of the L ‘ Lmodel see appendix C
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