The minimal fermionic model of electroweak baryogenesis

Egaña-Ugrinovic, Daniel

doi:10.1007/jhep12(2017)064

Cited by 21 publications

(27 citation statements)

References 70 publications

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“…In the presence of CP violation, these models also provide an appealing fermionic scenario for electroweak baryogenesis [78,79]. Figure 6: Constraints on electroweakinos from EDMs: the case of small phases.…”

Section: μ| [Tev]mentioning

confidence: 99%

Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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The ACME collaboration has recently announced a new constraint on the electron EDM, |d e |< 1.1×10 −29 e cm, from measurements of the ThO molecule. This is a powerful constraint on CP-violating new physics: even new physics generating the EDM at two loops is constrained at the multi-TeV scale. We interpret the bound in the context of different scenarios for new physics: a general order-of-magnitude analysis for both the electron EDM and the CP-odd electronnucleon coupling; 1-loop SUSY, probing sleptons above 10 TeV; 2-loop SUSY, probing multi-TeV charginos or stops; and finally, new physics that generates the EDM via the charm quark or top quark Yukawa couplings. In the last scenario, new physics generates a "QULE operator" (q f σ µνū f ) · ( σ µνē ), which in turn generates the EDM through RG evolution. If the QULE operator is generated at tree level, this corresponds to a previously studied leptoquark model. For the first time, we also classify scenarios in which the QULE operator is generated at one loop through a box diagram, which include SUSY and leptoquark models. The electron EDM bound is the leading constraint on a wide variety of theories of CP-violating new physics interacting with the Higgs boson or the top quark. We argue that any future nonzero measurement of an electron EDM will provide a strong motivation for constructing new colliders at the highest feasible energies. arXiv:1810.07736v1 [hep-ph] 17 Oct 2018 there are many motivations for searching for physics beyond the Standard Model, three of the most important are the matter-antimatter asymmetry of our universe, the existence of dark matter, and the fine-tuning puzzle of the Higgs boson mass. The matter-antimatter asymmetry clearly indicates a need for new CP-violating physics, which could first be detected through its indirect effect on the electron EDM. As we will discuss below, EDMs also have interesting connections with WIMP dark matter (in specific models) and with the fine-tuning problem.The possibility of testing heavy new physics through electric dipole moment measurements has been studied extensively; reviews include [11][12][13][14]. Here we attempt to briefly summarize some of the important history of the topic, with apologies for inevitable omissions. Some early theoretical studies of lepton EDMs appeared already in the 1970s [15,16]. Many of the early studies of CP violation in supersymmetric theories focused on the neutron EDM [17][18][19], but studies of the electron EDM in supersymmetry commenced [20] shortly after a suggestion of Gavela and Georgi that lepton EDMs could be effective probes of new physics [21]. Subsequently, a variety of additional sources of EDMs were studied, such as 3-gluon operators [22] or two-loop diagrams mediated by electroweak bosons [23,24]. A variety of new physics scenarios have been shown to predict interesting EDMs, including: stops in SUSY [25]; electroweakinos in SUSY [26] and specifically split SUSY [27,28]; two Higgs doublet models [24,[29][30][31]; SUSY beyond the MSSM [32,33]; and fermionic...

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Section: μ| [Tev]mentioning

confidence: 99%

Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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“…We thus expect that if we have the desired phase transition the scalars will generally be lighter than the vector-like leptons. 0.511 0.962 b 22 1.36…”

Section: Vector-like Lepton Collider Phenomenologymentioning

confidence: 99%

Electroweak baryogenesis with vector-like leptons and scalar singlets

Bell

Dolan

Friedrich

et al. 2019

J. High Energ. Phys.

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We investigate the viability of electroweak baryogenesis in a model with a first order electroweak phase transition induced by the addition of two gauge singlet scalars. A vector-like lepton doublet is introduced in order to provide CP violating interactions with the singlets and Standard Model leptons, and the asymmetry generation dynamics are examined using the vacuum expectation value insertion approximation. We find that such a model is readily capable of generating sufficient baryon asymmetry while satisfying electron electric dipole moment and collider phenomenology constraints.

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“…Before moving on, we mention that, as argued in Ref. [38], we expect the H † H 3 operator to have a negligible contribution (of the order v 2 /Λ 2 ) on the dynamics of the PTs in our model. We now turn our attention to the Landau poles appearing in our model.…”

Section: Theoretical Constraintsmentioning

confidence: 71%

“…Also, as noted in Ref. [38], having y N R y N L > 0 and y E R y E L > 0 favors SFOPTs, which is why we chose all the Yukawas to be positive. After each point in parameter space is generated, we check whether the said point is in agreement with experimental constraints.…”

Section: Scan For the Pt Strength Calculationmentioning

confidence: 96%

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Multistep strongly first order phase transitions from new fermions at the TeV scale

Angelescu

Huang

2019

Phys. Rev. D

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In spite of the vast literature on the subject of first order Electroweak Phase Transitions (EWPT), which can provide the necessary conditions for generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this paper, we consider a simple fermionic extension of the Standard Model involving one SU (2) L doublet and two SU (2) L singlet Vector-Like Leptons, strongly coupled to the Higgs scalar and with masses close to the TeV scale. We show how such a simple scenario can give rise to a non-trivial thermal history of the Universe, involving strongly first order multistep phase transitions occurring at temperatures close to the electroweak scale. Finally, we investigate the distinct Gravitational Wave (GW) signatures of these phase transitions at future space-based GW detectors, such as LISA, DECIGO, and BBO, and briefly discuss the possible LHC signatures of the VLLs. IntroductionThe origin of the baryon asymmetry in the Universe (BAU), which is also known as the matter-antimatter asymmetry, is one of the most outstanding problems in modern cosmology. Baryogenesis is an appealing scenario of generating the matter-antimatter asymmetry dynamically. In 1967, Sakharov enunciated three conditions for a successful baryogenesis: baryon number violation, C and CP violation, and a departure from the thermal equilibrium [1].Of particular interest for this work is the third condition, departure from thermal equilibrium, which can only be met if the Universe underwent a strongly first order phase transition (SFOPT) in its early stages. While there is no indication about the energy scale at which it happened, an attractive possibility would be that such a phase transition (PT) occurred around the Electroweak (EW) scale. Indeed, it is beyond any doubt that EW symmetry was broken at some point in the history of the Universe, and a straightforward possibility would be that the PT responsible for baryogenesis took place when EW symmetry was broken.As any cosmological PT, an Electroweak phase transition (EWPT) would generate a stochastic GW background sourced in the collision of nucleating bubbles and the plasma motion induced by bubble collisions. In the specific case of a strong EWPT, it is expected that, due to redshift, the GW signal would nowadays peak at frequencies around the mHz-dHz range [2]. Interestingly, this frequency range overlaps with the frequency ranges which future space-based interferometers, such as LISA [2], DECIGO [3], and BBO [4], will be most sensitive to. Discovering such a gravitational wave signal would establish the EWPT as a new milestone in our understanding of the early universe.In the Standard Model (SM), electroweak symmetry breaking (EWSB) would proceed via a smooth crossover unless the Higgs mass is below ∼ 70 GeV [5,6]. Therefore, the discovery of the SM Higgs boson with a mass m h = 125 GeV [7,8] meant that the SM alone cannot satisfy the third Sakharov condition, i.e. departure from thermal equilibrium. 1 Consequently, the problem of stro...

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The minimal fermionic model of electroweak baryogenesis

Cited by 21 publications

References 70 publications

Interpreting the electron EDM constraint

Interpreting the electron EDM constraint

Electroweak baryogenesis with vector-like leptons and scalar singlets

Multistep strongly first order phase transitions from new fermions at the TeV scale

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