Minimal models for dark matter and the muon g − 2 anomaly

Lorenzo Calibbi; Robert Ziegler; Jure Zupan

doi:10.1007/jhep07(2018)046

Minimal models for g−2 and dark matter confront asymptotic safety

Physical Review D ◽

10.1103/physrevd.103.115032 ◽

2021 ◽

Vol 103 (11) ◽

Author(s):

Kamila Kowalska ◽

Enrico Maria Sessolo

Keyword(s):

Dark Matter ◽

Minimal Models ◽

Asymptotic Safety

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Composite dark matter from strongly-interacting chiral dynamics

Journal of High Energy Physics ◽

10.1007/jhep02(2021)091 ◽

2021 ◽

Vol 2021 (2) ◽

Author(s):

Roberto Contino ◽

Alessandro Podo ◽

Filippo Revello

Keyword(s):

Dark Matter ◽

Gauge Group ◽

High Energy ◽

Minimal Models ◽

Goldstone Bosons ◽

Weakly Coupled ◽

The Standard Model ◽

New States ◽

Dark Color

Abstract A class of chiral gauge theories is studied with accidentally-stable pseudo Nambu-Goldstone bosons playing the role of dark matter (DM). The gauge group contains a vector-like dark color factor that confines at energies larger than the electroweak scale, and a U(1)D factor that remains weakly coupled and is spontaneously broken. All new scales are generated dynamically, including the DM mass, and the IR dynamics is fully calculable. We analyze minimal models of this kind with dark fermions transforming as non-trivial vector-like representations of the Standard Model (SM) gauge group. In realistic models, the DM candidate is a SM singlet and comes along with charged partners that can be discovered at high-energy colliders. The phenomenology of the lowest-lying new states is thus characterized by correlated predictions for astrophysical observations and laboratory experiments.

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Whac-a-constraint with anomaly-free dark matter models

10.21468/scipostphys.6.2.020 ◽

2019 ◽

Vol 6 (2) ◽

Cited By ~ 2

Author(s):

Sonia El Hedri ◽

Karl Nordström

Keyword(s):

Dark Matter ◽

Standard Model ◽

Parameter Space ◽

Direct Detection ◽

Simplified Model ◽

Dark Matter Candidate ◽

Minimal Models ◽

Simplified Models ◽

The Standard Model ◽

The One

Theories where a fermionic dark matter candidate interacts with the Standard Model through a vector mediator are often studied using minimal models, which are not necessarily anomaly-free. In fact, minimal anomaly-free simplified models are usually strongly constrained by either direct detection experiments or collider searches for dilepton resonances. In this paper, we study the phenomenology of models with a fermionic dark matter candidate that couples axially to a leptophobic vector mediator. Canceling anomalies in these models requires considerably enlarging their field content. For an example minimal scenario we show that the additional fields lead to a potentially much richer phenomenology than the one predicted by the original simplified model. In particular collider searches for pair-produced neutralinos and charginos can be more sensitive than traditional monojet searches in thermally motivated parts of the parameter space where the mediator is outside the reach of current searches.

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Twin Higgs portal dark matter

Journal of High Energy Physics ◽

10.1007/jhep08(2021)009 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

David Curtin ◽

Shayne Gryba

Keyword(s):

Dark Matter ◽

Direct Detection ◽

Discrete Symmetry ◽

Scalar Coupling ◽

Minimal Models ◽

Hierarchy Problem ◽

Quartic Interaction ◽

Little Hierarchy Problem ◽

Higgs Portal ◽

Scalar Sector

Abstract Many minimal models of dark matter (DM) or canonical solutions to the hierarchy problem are either excluded or severely constrained by LHC and direct detection null results. In particular, Higgs Portal Dark Matter (HPDM) features a scalar coupling to the Higgs via a quartic interaction, and obtaining the measured relic density via thermal freeze-out gives definite direct detection predictions which are now almost entirely excluded. The Twin Higgs solves the little hierarchy problem without coloured top partners by introducing a twin sector related to the Standard Model (SM) by a discrete symmetry. We generalize HPDM to arbitrary Twin Higgs models and introduce Twin Higgs Portal Dark Matter (THPDM), which features a DM candidate with an SU(4)-invariant quartic coupling to the Twin Higgs scalar sector. Given the size of quadratic corrections to the DM mass, its most motivated scale is near the mass of the radial mode. In that case, DM annihilation proceeds with the full Twin Higgs portal coupling, while direct detection is suppressed by the pNGB nature of the 125 GeV Higgs. For a standard cosmological history, this results in a predicted direct detection signal for THPDM that is orders of magnitude below that of HPDM with very little dependence on the precise details of the twin sector, evading current bounds but predicting possible signals at next generation experiments. In many Twin Higgs models, twin radiation contributions to ∆Neff are suppressed by an asymmetric reheating mechanism. We study this by extending the νMTH and X MTH models to include THPDM and compute the viable parameter space according to the latest CMB bounds. The injected entropy dilutes the DM abundance as well, resulting in additional suppression of direct detection below the neutrino floor.

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