Electroweak Baryogenesis from Dark-Sector 
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 Violation

Carena, Marcela; Quirós, M.; Zhang, Yue

doi:10.1103/physrevlett.122.201802

Cited by 38 publications

(27 citation statements)

References 58 publications

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“…One should note that such a conclusion is drawn by assuming the L 0 L ; L 00 R fields to be relativistic degrees of freedom in the thermal bath during the EWPT. As pointed out in [11], the above cancellation is closely related to Eq. (B2), the conservation of the current J μ , with respect to SUð2Þ L .…”

Section: Effective Theorysupporting

confidence: 60%

“…Moreover, because the Z 0 couples to an anomalous current with respect to SUð2Þ 2 L in the low-energy theory, it makes important contributions to flavor-changing meson decays such as K → πZ 0 and B → KZ 0 through the Wess-Zumino term that occurs at two-loop level [38]. 11 For very light Z 0 , these decays are mainly into the longitudinal component of the Z 0 boson and the corresponding rates are enhanced by 1=M 2 Z 0. The Z 0 boson then decays into charged lepton pairs or neutrinos.…”

Section: A Searches For the Leptophilic Zmentioning

confidence: 99%

“…In a recent short article [11], we presented the basic idea of a new EWBG mechanism in which the role of messenger of the CP asymmetry can be played by a Z 0 gauge boson that couples to both the SM and the dark sector. The lowenergy effective theory is a dark sector model containing a Dirac fermion χ (charged under the Z 0 ) with a CP violating coupling to a complex scalar field S. During a first-order phase transition, in the electroweak and the dark sectors involving both the Higgs field and the scalar S, a chiralcharge asymmetry in χ particles is first created.…”

Section: Introductionmentioning

confidence: 99%

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Dark CP violation and gauged lepton or baryon number for electroweak baryogenesis

2020

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We explore the generation of the baryon asymmetry in an extension of the standard model where the lepton number is promoted to a Uð1Þ l gauge symmetry with an associated Z 0 gauge boson. This is based on a novel electroweak baryogenesis mechanism first proposed by us in Ref. [M. Carena, M. Quiros, and Y. Zhang, Electroweak Baryogenesis From Dark CP violation, Phys. Rev. Lett. 122, 201802 (2019).]. Extra fermionic degrees of freedom, including a fermionic dark matter χ, are introduced in the dark sector for anomaly cancellation. The lepton number is spontaneously broken at high scale and the effective theory, containing the standard model, the Z 0 , the fermionic dark matter, and an additional complex scalar field S, violates CP in the dark sector. The complex scalar field couples to the Higgs portal and is essential in enabling a strong first order phase transition. Dark CP violation is diffused in front of the bubble walls and creates a chiral asymmetry for χ, which in turn creates a chemical potential for the standard model leptons. Weak sphalerons are then in charge of transforming the net lepton charge asymmetry into net baryon number. We explore the model phenomenology related to the leptophilic Z 0 , the dark matter candidate, the Higgs boson, and the additional scalar, as well as implications for electric dipole moments. We also discuss the case when baryon number Uð1Þ B is promoted to a gauge symmetry, and discuss electroweak baryogenesis and its corresponding phenomenology.

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Section: Effective Theorysupporting

confidence: 60%

Section: A Searches For the Leptophilic Zmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dark CP violation and gauged lepton or baryon number for electroweak baryogenesis

2020

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“…This is one of the few anomaly free U (1) gauge extensions of the SM [21,22], and is the only such model without tree-level couplings to first generation quarks and/or leptons. 1 For this reason, U (1) Lµ−Lτ models are relatively unconstrained and lead to qualitatively different phenomenological and cosmological consequences [5,[23][24][25][26][27][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Cosmology with a very light Lμ − Lτ gauge boson

Escudero

Hooper

Krnjaic

et al. 2019

J. High Energ. Phys.

234

273

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In this paper, we explore in detail the cosmological implications of an abelian L µ − L τ gauge extension of the Standard Model featuring a light and weakly coupled Z . Such a scenario is motivated by the longstanding ∼ 4σ discrepancy between the measured and predicted values of the muon's anomalous magnetic moment, (g − 2) µ , as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the Z population will decay to neutrinos, increasing the overall energy density of radiation and altering the expansion history of the early universe. We identify two distinct regions of parameter space in this model in which the Hubble tension can be significantly relaxed. The first of these is the previously identified region in which a ∼ 10 − 20 MeV Z reaches equilibrium in the early universe and then decays, heating the neutrino population and delaying the process of neutrino decoupling. For a coupling of g µ−τ (3 − 8) × 10 −4 , such a particle can also explain the observed (g − 2) µ anomaly. In the second region, the Z is very light (m Z ∼ 1 eV to MeV) and very weakly coupled (g µ−τ ∼ 10 −13 to 10 −9 ). In this case, the Z population is produced through freeze-in, and decays to neutrinos after neutrino decoupling. Across large regions of parameter space, we predict a contribution to the energy density of radiation that can appreciably relax the reported Hubble tension, ∆N eff 0.2.

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“…The additional singlet scalar, as is well known, can be used to induce/enhance a first order electroweak phase transition. Recent applications of dark sector CP-violation to mechanisms of baryogenesis include [28][29][30].…”

Section: Discussionmentioning

confidence: 99%

Electric dipole moments from dark sectors

2019

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We examine the sensitivity of electric dipole moments (EDMs) to new CP-violating physics in a hidden (or dark) sector, neutral under the Standard Model (SM) gauge groups, and coupled via renormalizable portals. In the absence of weak sector interactions, we show that the electron EDM can be induced purely through the gauge kinetic mixing portal, but requires five loops, and four powers of the kinetic mixing parameter ϵ. Allowing weak interactions, and incorporating the Higgs and neutrino portals, we show that the leading contributions to d e arise at two-loop order, with the main source of CP-violating being in the interaction of dark Higgs and heavy singlet neutrinos. In such models, EDMs can provide new sensitivity to portal couplings that is complementary to direct probes at the intensity frontier or high energy colliders.

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Electroweak Baryogenesis from Dark-Sector CP Violation

Cited by 38 publications

References 58 publications

Dark CP violation and gauged lepton or baryon number for electroweak baryogenesis

Dark CP violation and gauged lepton or baryon number for electroweak baryogenesis

Cosmology with a very light Lμ − Lτ gauge boson

Electric dipole moments from dark sectors

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