Exceptional composite dark matter

Abstract

We study the dark matter phenomenology of nonminimal composite Higgs models with SO(7) broken to the exceptional group G 2 . In addition to the Higgs, three pseudoNambu-Goldstone bosons arise, one of which is electrically neutral. A parity symmetry is enough to ensure this resonance is stable. In fact, if the breaking of the Goldstone symmetry is driven by the fermion sector, this Z 2 symmetry is automatically unbroken in the electroweak phase. In this case, the relic density, as well as the expected indirect, direct and collider signals are then uniquely determined by the value of the compositeness scale, f . Current experimental bounds allow one to account for a large fraction of the dark matter of the Universe if the dark matter particle is part of an electroweak triplet. The totality of the relic abundance can be accommodated if instead this particle is a composite singlet. In both cases, the scale f and the dark matter mass are of the order of a few TeV.

A global view of the off-shell Higgs portal

“…[42] and those obtained in our main analysis. 11 We are able to reproduce well the results of Ref. [42], agreement being excellent for the FCC and good for the HL-LHC.…”

“…This exercise helps us to pinpoint the differences between our analysis and that of Ref. [42]: 11 Only for this plot, following Ref. [42] we adopt the coupling normalization c φ = λ/2 and use a two-sided test to determine the exclusion bounds, i.e.…”

“…This possibility is especially motivated by theories where the Higgs and the DM arise together as composite pNGBs, thus addressing simultaneously the naturalness and DM puzzles [2]. Models of this type have received increasing attention lately [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The key point is that the scalar DM, assumed to be a singlet under the Standard Model (SM) gauge interactions, couples to the SM through higher-dimensional, derivative interactions with the Higgs field, that arise from the kinetic term of the nonlinear sigma model.…”

Minimal spin-one isotriplet dark matter

“…One of the most popular expectations is that DM could be made up of one or more types of weakly interacting massive particles (WIMPs). Many WIMP candidates have been proposed, including scalars [1][2][3][4], neutral fermions (the most notable example being neutralinos appearing in supersymmetric models [5]), neutral gauge bosons (such as the Kaluza-Klein excitation of the photon [6][7][8] in models with universal extra dimensions) and light mesons in composite Higgs models [9][10][11]. DM particles must be stable on at least cosmological time scales.…”

Coset cosmology

“…[1][2][3][4][5][6][7][8]) and composite models of Dark Matter (see e.g. [9][10][11][12][13][14][15][16][17]) received recent attention. In the introduction, for concreteness, we focus on composite Higgs models but our results apply in general to theories with spontaneous breaking of global symmetries.…”