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Low scale Dirac leptogenesis and dark matter with observable [Formula omitted]

Mahanta, Devabrat ; Borah, Debasish

The European physical journal. C, Particles and fields, 2022-05, Vol.82 (5) [Periódico revisado por pares]

Springer

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  • Título:
    Low scale Dirac leptogenesis and dark matter with observable [Formula omitted]
  • Autor: Mahanta, Devabrat ; Borah, Debasish
  • Assuntos: Analysis ; Dark matter (Astronomy)
  • É parte de: The European physical journal. C, Particles and fields, 2022-05, Vol.82 (5)
  • Descrição: We propose a gauged [Formula omitted] extension of the standard model (SM) where light neutrinos are of Dirac type by virtue of tiny Yukawa couplings. To achieve leptogenesis, we include additional heavy Majorana fermions without introducing any [Formula omitted] violation by two units. An additional scalar doublet with appropriate [Formula omitted] charge can allow such heavy fermion coupling with SM leptons so that out-of-equilibrium decay of the former can lead to generation of lepton asymmetry. Due to the [Formula omitted] gauge interactions of the decaying fermion, the criteria of successful Dirac leptogenesis can also constrain the gauge sector couplings. The same [Formula omitted] gauge sector parameter space can also be constrained from dark matter requirements if the latter is assumed to consist of SM singlet particles with non-zero [Formula omitted] charges, which also keep the model anomaly free. The same [Formula omitted] gauge interactions also lead to additional thermalised relativistic degrees of freedom [Formula omitted] from light Dirac neutrinos which are tightly constrained by Planck 2018 data. While there exists parameter space from the criteria of successful leptogenesis, dark matter and [Formula omitted] even after incorporating the latest collider bounds, the currently allowed parameter space can be probed by future measurements of [Formula omitted].
  • Editor: Springer
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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