Scalar triplet leptogenesis with a CP violating phase

Chongdar, Sreerupa; Mishra, Sasmita

doi:10.1016/j.nuclphysb.2023.116346

Cited by 3 publications

(2 citation statements)

References 67 publications

(43 reference statements)

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“…on seesaw scenarios provide promising framework for explaining small neutrino mass and baryon asymmetry of the Universe (BAU) within a single theoretical setting. In order to have successful leptogenesis, in Type-I and Type-II seesaw extensions, the heavy singlet fermion and scalar triplet, respectively, contribute to the overall lepton asymmetry which further can be converted to baryon asymmetry via sphaleron processes [7][8][9][10][11][12][13][14][15]. The phenomena of leptogenesis in various extensions of the SM has been discussed thoroughly in the literature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Jcap02(2024)041mentioning

confidence: 99%

Low scale leptogenesis in singlet-triplet scotogenic model

Singh,

Mahanta,

Verma

2024

J. Cosmol. Astropart. Phys.

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The scotogenic model presents an elegant and succinct framework for elucidating the origin of tiny neutrino masses within the framework of the Standard Model, employing radiative corrections within the domain of the dark sector. We investigate the possibility of achieving low-scale leptogenesis in the singlet-triplet scotogenic model (STSM), where dark matter mediates neutrino mass generation. We initially considered a scenario involving two moderately hierarchical heavy fermions, N and Σ, wherein the lepton asymmetry is generated by the out-of-equilibrium decay of both particles. Our analysis indicates that the scale of leptogenesis in this scenario is similar to that of standard thermal leptogenesis and is approximately M N,Σ ∼ 109 GeV, which is comparable to the Type-I seesaw case. Further, we consider the case with three heavy fermions (N 2, N 2, and Σ) with the hierarchy M N 1 < M Σ ≪ MM N 2 , which yields the lower bound on heavy fermions up to 3.1 TeV, therefore significantly reduce the scale of the leptogenesis up to TeV scale. The only prerequisite is suppression in the N 1 and Σ Yukawa couplings, which causes suppressed washout effects and a small active neutrino mass of about 10-5 eV. This brings about the fascinating insight that experiments aiming to measure the absolute neutrino mass scale can test low-scale leptogenesis in the scotogenic model. Further, the hyperchargeless scalar triplet Ω provides an additional contribution to mass of the W-boson explaining CDF-II result.

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Section: Jcap02(2024)041mentioning

confidence: 99%

Low scale leptogenesis in singlet-triplet scotogenic model

Singh,

Mahanta,

Verma

2024

J. Cosmol. Astropart. Phys.

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“…In the case of triplet leptogenesis, the flavor interplay comes to be very crucial [36] due to the unique decay channels of the scalar triplets. While flavored leptogenesis has already been studied in the framework of explicit CP violation [20], it is equally appealing to accommodate flavored leptogenesis through SCPV [17,34,38,42,48]. In this work, we explore the role of the SCPV via the complex VEV of the scalar sector in flavored leptogenesis.…”

Section: Jcap04(2024)054mentioning

confidence: 99%

Triplet scalar flavored leptogenesis with spontaneous CP violation

Chongdar,

Mishra

2024

J. Cosmol. Astropart. Phys.

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The inclusion of two triplet scalars in the Standard Model (SM) enables to accommodate neutrino mass generation as well as baryogenesis through leptogenesis. One of the essential ingredients of leptogenesis is the violation of charge conjugation and parity (CP) symmetry in lepton number violating decays of the triplet scalars. We work on the promising sector of spontaneous CP violation (SCPV) which is manifested by the involvement of one scalar singlet and two scalar fields, added to the SM. The predictive aspect of the model is accomplished by imposing A 4 × Z 4 symmetry which results in the traditional tribimaximal mixing pattern. With updated data on neutrino oscillation, we study the parameter space of the model. The phase of the complex vacuum expectation value (VEV) of the singlet scalar acts as the common source of CP violation in both low and high energy sectors. Due to the flavor symmetry of the model, required baryon asymmetry cannot be accomplished via unflavored leptogenesis. In the temperature regime, [109, 1012] GeV when flavor effects become important in the study of leptogenesis, it is shown that baryogenesis is achievable. The rich flavor interplay is explored through the study of the density matrix equations. We also study the interplay of hierarchical branching ratios of the decay of the triplet scalars and SCPV phase to accommodate the required CP asymmetry to account for the final baryon asymmetry in the observational range. Considering all possible mass hierarchies among the triplet scalars, the flavor structure of the triplet Yukawa couplings results in different scales of leptogenesis.

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Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw model

Chongdar,

Mishra

2025

Nuclear Physics B

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Scalar triplet leptogenesis with a CP violating phase

Cited by 3 publications

References 67 publications

Low scale leptogenesis in singlet-triplet scotogenic model

Low scale leptogenesis in singlet-triplet scotogenic model

Triplet scalar flavored leptogenesis with spontaneous CP violation

Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw model

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