Asymmetric long-lived dark matter and leptogenesis from type-III seesaw framework
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866912209542578176 |
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| author | Mahapatra, Satyabrata Paul, Partha Kumar Sahu, Narendra Shukla, Prashant |
| author_facet | Mahapatra, Satyabrata Paul, Partha Kumar Sahu, Narendra Shukla, Prashant |
| contents | We propose a simple model in the type-III seesaw framework to explain the neutrino mass, asymmetric dark matter (ADM), and baryon asymmetry of the Universe. We extend the standard model with a vector-like singlet lepton ($χ$) and a hypercharge zero scalar triplet ($Δ$) in addition to three hypercharge zero triplet fermions($Σ_i~,i=1,2,3$). A $Z_2$ symmetry is imposed under which $χ$ and $Δ$ are odd, while all other particles are even. As a result, the lightest $Z_2$ odd particle $χ$ behaves as a candidate of DM. In the early Universe, the $CP$-violating out-of-equilibrium decay of heavy triplet fermions to the Standard Model lepton ($L$) and Higgs ($H$) generate a net lepton asymmetry, while that of triplet fermions to $χ$ and $Δ$ generate a net asymmetric DM. The lepton asymmetry is converted to the required baryon asymmetry of the Universe via the electroweak sphalerons, while the asymmetry in $χ$ remains as a DM relic that we observe today. We introduce a singlet scalar $Φ$, with mass $M_ϕ< M_χ$, which not only assists to deplete the symmetric component of $χ$ through the annihilation process: $\barχ χ\to ΦΦ$ but also paves a path to detect DM $χ$ at direct search experiments through $Φ-H$ mixing. The electro-weak symmetry breaking induces a non-zero vacuum expectation value to $Δ$, which leads to an unstable asymmetric DM ranging from a few MeV to hundreds of GeV. We then explore the displaced vertex signatures of the charged components of the scalar triplet $Δ$ at colliders. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_11138 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Asymmetric long-lived dark matter and leptogenesis from type-III seesaw framework Mahapatra, Satyabrata Paul, Partha Kumar Sahu, Narendra Shukla, Prashant High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a simple model in the type-III seesaw framework to explain the neutrino mass, asymmetric dark matter (ADM), and baryon asymmetry of the Universe. We extend the standard model with a vector-like singlet lepton ($χ$) and a hypercharge zero scalar triplet ($Δ$) in addition to three hypercharge zero triplet fermions($Σ_i~,i=1,2,3$). A $Z_2$ symmetry is imposed under which $χ$ and $Δ$ are odd, while all other particles are even. As a result, the lightest $Z_2$ odd particle $χ$ behaves as a candidate of DM. In the early Universe, the $CP$-violating out-of-equilibrium decay of heavy triplet fermions to the Standard Model lepton ($L$) and Higgs ($H$) generate a net lepton asymmetry, while that of triplet fermions to $χ$ and $Δ$ generate a net asymmetric DM. The lepton asymmetry is converted to the required baryon asymmetry of the Universe via the electroweak sphalerons, while the asymmetry in $χ$ remains as a DM relic that we observe today. We introduce a singlet scalar $Φ$, with mass $M_ϕ< M_χ$, which not only assists to deplete the symmetric component of $χ$ through the annihilation process: $\barχ χ\to ΦΦ$ but also paves a path to detect DM $χ$ at direct search experiments through $Φ-H$ mixing. The electro-weak symmetry breaking induces a non-zero vacuum expectation value to $Δ$, which leads to an unstable asymmetric DM ranging from a few MeV to hundreds of GeV. We then explore the displaced vertex signatures of the charged components of the scalar triplet $Δ$ at colliders. |
| title | Asymmetric long-lived dark matter and leptogenesis from type-III seesaw framework |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2305.11138 |