Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP

Pramanick, Rohan; Ray, Tirtha Sankar; Shaw, Avirup

doi:10.1007/jhep06(2023)099

Cited by 2 publications

(1 citation statement)

References 69 publications

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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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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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Toward a more complete description of hybrid leptogenesis

Pramanick,

Ray,

Sil

2024

Phys. Rev. D

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The hybrid leptogenesis framework combining the type-I and type-II seesaw mechanisms for neutrino mass necessarily include scattering topologies involving both the scalar triplet and the right-handed neutrino. We demonstrate that a systematic inclusion of these mixed scatterings can significantly alter the evolution of the number densities exhibiting, up to a factor ten, deviation in the predicted asymmetry as demonstrated by our benchmark scenarios. We provide quantitative constraints on the degeneracy of the seesaw scales where the complete analysis becomes numerically significant, limiting the validity of leptogenesis being dominated by the lightest seesaw species only. Published by the American Physical Society 2024

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Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP

Cited by 2 publications

References 69 publications

Triplet scalar flavored leptogenesis with spontaneous CP violation

Triplet scalar flavored leptogenesis with spontaneous CP violation

Toward a more complete description of hybrid leptogenesis

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