Leptogenesis from a U(1) D resonance

Eung Jin Chun; Arnab Dasgupta; Sin Kyu Kang

doi:10.1007/JHEP08(2020)095

Leptogenesis from a U(1)_D resonance

Eung Jin Chun, Arnab Dasgupta, Sin Kyu Kang

School of Natural Sciences

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Abstract

We propose a novel mechanism to realize leptogenesis through the Breit- Wigner resonance of a dark U(1)_D gauge boson Z_D , which mediates lepton number vi- olating annihilations of dark matter (DM) in the context of the scotogenic model with a U(1)_D. The processes occur out of equilibrium and DM freezes out later giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by Z_D , which arises due to the unremovable imaginary part of either the Z_D propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of Z_Dν¯ ν.

Original language	English
Article number	95
Journal	Journal of High Energy Physics
Volume	2020
Issue number	8
DOIs	https://doi.org/10.1007/JHEP08(2020)095
State	Published - 1 Aug 2020

Keywords

Beyond Standard Model
Cosmology of Theories beyond the SM
Neutrino Physics

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10.1007/JHEP08(2020)095

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abstract = "We propose a novel mechanism to realize leptogenesis through the Breit- Wigner resonance of a dark U(1)D gauge boson ZD , which mediates lepton number vi- olating annihilations of dark matter (DM) in the context of the scotogenic model with a U(1)D. The processes occur out of equilibrium and DM freezes out later giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by ZD , which arises due to the unremovable imaginary part of either the ZD propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of ZDν¯ ν.",

keywords = "Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics",

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N2 - We propose a novel mechanism to realize leptogenesis through the Breit- Wigner resonance of a dark U(1)D gauge boson ZD , which mediates lepton number vi- olating annihilations of dark matter (DM) in the context of the scotogenic model with a U(1)D. The processes occur out of equilibrium and DM freezes out later giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by ZD , which arises due to the unremovable imaginary part of either the ZD propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of ZDν¯ ν.

AB - We propose a novel mechanism to realize leptogenesis through the Breit- Wigner resonance of a dark U(1)D gauge boson ZD , which mediates lepton number vi- olating annihilations of dark matter (DM) in the context of the scotogenic model with a U(1)D. The processes occur out of equilibrium and DM freezes out later giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by ZD , which arises due to the unremovable imaginary part of either the ZD propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of ZDν¯ ν.

KW - Beyond Standard Model

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Leptogenesis from a U(1)_D resonance

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