Singlet fermionic dark matter and the electroweak phase transition

Fairbairn, Malcolm; Hogan, Robert

doi:10.1007/jhep09(2013)022

Cited by 73 publications

(74 citation statements)

References 80 publications

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“…We focus on models in which fermionic DM particles couple to a new scalar species and argue that the resulting scalar potential may undergo multiple phase transitions, "flip-flopping" between phases in which the symmetry stabilising the DM is intact and a phase where it is broken. Similar behaviour is found in models of electroweak baryogenesis [8][9][10][11][12][13][14], see also [15] for related work. During the broken phase, the initially overabundant DM particles are depleted until their relic density reaches the value observed today.…”

supporting

confidence: 73%

Dark Matter Decay between Phase Transitions at the Weak Scale

Baker

Kopp

2017

Phys. Rev. Lett.

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We propose a new alternative to the Weakly Interacting Massive Particle (WIMP) paradigm for dark matter. Rather than being determined by thermal freeze-out, the dark matter abundance in this scenario is set by dark matter decay, which is allowed for a limited amount of time just before the electroweak phase transition. More specifically, we consider fermionic singlet dark matter particles coupled weakly to a scalar mediator S3 and to auxiliary dark sector fields, charged under the Standard Model gauge groups. Dark matter freezes out while still relativistic, so its abundance is initially very large. As the Universe cools down, the scalar mediator develops a vacuum expectation value (vev), which breaks the symmetry that stabilises dark matter. This allows dark matter to mix with charged fermions and decay. During this epoch, the dark matter abundance is reduced to give the value observed today. Later, the SM Higgs field also develops a vev, which feeds back into the S3 potential and restores the dark sector symmetry. In a concrete model we show that this "vev flip-flop" scenario is phenomenologically successful in the most interesting regions of its parameter space. We also comment on detection prospects at the LHC and elsewhere.The WIMP (Weakly Interacting Massive Particle) paradigm in dark matter physics states that dark matter (DM) particles should have non-negligible couplings to Standard Model (SM) particles. Their abundance today would then be determined by their abundance at freeze-out, the time when the temperature of the Universe dropped to the level where interactions producing and annihilating DM particles become inefficient. In many models these interactions should still be observable today, through residual DM annihilation in galaxies and galaxy clusters, through scattering of DM particles on atomic nuclei, or through DM production at colliders. The conspicuous absence of any convincing signals [1][2][3][4][5][6][7] to date motivates us to look for alternatives to the WIMP paradigm.In this letter, we present a scenario in which the DM abundance is set not by annihilation, but by decay. We focus on models in which fermionic DM particles couple to a new scalar species and argue that the resulting scalar potential may undergo multiple phase transitions, "flip-flopping" between phases in which the symmetry stabilising the DM is intact and a phase where it is broken. Similar behaviour is found in models of electroweak baryogenesis [8][9][10][11][12][13][14], see also [15] for related work. During the broken phase, the initially overabundant DM particles are depleted until their relic density reaches the value observed today. Although the resulting picture of early freeze out, followed by a period of DM decay around the weak scale, is quite generic, we focus here on a concrete example and comment on possible generalisations in the end.Model Framework.-We introduce a complex dark sector scalar S 3 that is a triplet under the SM SU (2) L gauge symmetry and carries zero hypercharge. We take the DM particle to...

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supporting

confidence: 73%

Dark Matter Decay between Phase Transitions at the Weak Scale

Baker

Kopp

2017

Phys. Rev. Lett.

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“…A similar model with S, E both SU(2) W doublets and a splitting of the dark matter fermion into different Majorana mass eigenstates was considered in [17] while related but more minimal models with EW singlet S, χ is discussed in [14,[18][19][20]. We discuss simple variations of the model at the end of the paper.…”

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confidence: 99%

LUX constraints on magnetic dark matter in a perturbative extension of the standard model with(out) naturality

et al. 2014

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We study phenomenological constraints in a simple SEχy extension of the Standard Model (SM) with a 125 GeV Higgs, a vectorlike heavy electron (E), a complex scalar electron (S) and a standard model singlet Dirac fermion (χ). The interactions among the dark matter candidate χ and the standard model particles occur via loop-induced processes involving the Yukawa interaction SEχy. The model is an explicit perturbative realization of so-called magnetic dark matter. The field content allows for a cancelation of quadratic divergences in the scalar masses at one-loop, a phenomenon which we refer to as perturbative naturality. The basic model is constrained dominantly by direct detection experiments and its parameter space can be nearly entirely covered by up-coming ton-scale direct detection experiments. We conclude this work by discussing different variations of the model.

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“…[12]). Moreover, it can act as a dark matter (DM) candidate [13] or as a portal to DM [14][15][16][17], depending on its stability.…”

Section: Jhep08(2015)004mentioning

confidence: 99%

“…The full expressions for the spin-independent cross section can be found in refs. [15,17]. In figure 13 the normalized spin-independent cross section is plotted as a function of the DM candidate mass for the two benchmark points.…”

Section: Direct Detectionmentioning

confidence: 99%

Resonant Higgs boson pair production in the h h → b b ¯ W W → b b ¯ ℓ + ν ℓ − ν ¯ $$ hh\to b\overline{b}\ WW\to b\overline{b}{\ell}^{+}\nu {\ell}^{-}\overline{\nu} $$ decay channel

Lozano

Moreno

Park

2015

J. High Energ. Phys.

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The addition of a scalar singlet provides one of the simplest extensions of the Standard Model. In this work we briefly review the latest constraints on the mass and mixing of the new Higgs boson and study its production and decay at the LHC. We mainly focus on double Higgs production in the hh → bbW W → bb + ν −ν decay channel. This decay is found to be efficient in a region of masses of the heavy Higgs boson of 260-500 GeV, so it is complementary to the 4b channel, more efficient for Higgs bosons with masses greater than 500 GeV. We analyse this di-leptonic decay channel in detail using kinematic variables such as M T2 and the M T2 -assisted on-shell reconstruction of invisible momenta. Using proper cuts, a significance of ∼ 3σ for 3000 fb −1 can be achieved at the 14 TeV LHC for m H = 260-400 GeV if the mixing is close to its present limit and BR(H → hh) ≈ 1. Smaller values for the mixing would require combining various decay channels in order to reach a similar significance. The complementarity among H → hh, H → ZZ and H → W W channels is studied for arbitrary BR(H → hh) values.

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Singlet fermionic dark matter and the electroweak phase transition

Cited by 73 publications

References 80 publications

Dark Matter Decay between Phase Transitions at the Weak Scale

Dark Matter Decay between Phase Transitions at the Weak Scale

LUX constraints on magnetic dark matter in a perturbative extension of the standard model with(out) naturality

Resonant Higgs boson pair production in the h h → b b ¯ W W → b b ¯ ℓ + ν ℓ − ν ¯ $$ hh\to b\overline{b}\ WW\to b\overline{b}{\ell}^{+}\nu {\ell}^{-}\overline{\nu} $$ decay channel

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