Dark Matter constraints on composite Higgs models

Abstract

Abstract:In composite Higgs models the pseudo-Nambu-Goldstone Boson (pNGB) nature of the Higgs field is an interesting alternative for explaining the smallness of the electroweak scale with respect to the beyond the Standard Model scale. In non-minimal models additional pNGB states are present and can be a Dark Matter (DM) candidate, if there is an approximate symmetry suppressing their decay. Here we assume that the low energy effective theory (for scales much below the compositeness scale) corresponds to the Standard Model with a pNGB Higgs doublet and a pNGB DM multiplet. We derive general effective DM Lagrangians for several possible DM representations (under the SM gauge group), including the singlet, doublet and triplet cases. Within this framework we discuss how the DM observables (relic abundance, direct and indirect detection) constrain the dimension-6 operators induced by the strong sector assuming that DM behaves as a Weakly Interacting Particle (WIMP) and that the relic abundance is settled through the freeze-out mechanism. We also apply our general results to two specific cosets: SO(6)/SO(5) and SO(6)/SO(4)×SO(2), which contain a singlet and doublet DM candidate, respectively. In particular we show that if compositeness is a solution to the little hierarchy problem, representations larger than the triplet are strongly disfavored. Furthermore, we find that composite models can have viable DM candidates with much smaller direct detection cross-sections than their non-composite counterparts, making DM detection much more challenging.

Charged composite scalar dark matter

“…(4.3). Neglecting relativistic corrections we have s ≈ 4m 2 χ , therefore the two contributions cancel out for m 2 χ ∼ λf 2 /2, leading to a strong suppression of the annihilation cross section [4,9,37]. This feature can be clearly observed in the cross sections for annihilation into W W, ZZ and also hh, see the left panel of figure 6.…”

Monojet searches for momentum-dependent dark matter interactions

“…[9]. Further related studies are also available in the literature [10][11][12]. After electroweak symmetry breaking, the part of the Lagrangian containing the interactions of η with the physical Higgs boson h is given by 2) and the η mass m η satisfies m…”

“…light scalar fields connected to the spontaneous breaking of a global symmetry at an energy scale f . More concretely, this class of models includes composite Higgs scenarios where the set of pNGBs involves the Higgs boson and possibly extra dark scalar particles [9][10][11][12][13][14]. In this case, the pNGB shift symmetry indeed only allows for derivative (momentum-dependent) pNGB interactions suppressed by powers of the scale f .…”

Unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures

“…In this spirit, composite Higgs models (CHMs) [5][6][7] have played a major role in recent years. In particular, the minimal CHM [8] has deserved special attention, but nonminimal CHMs have also been studied in detail, as their extended scalar sectors may provide solutions to the intricacies of new physics [9][10][11][12][13][14][15][16][17][18]. This is especially well motivated, given that departures from the SM predictions can be plausibly hidden in the Higgs sector, which is not precisely measured yet.…”