Resonant leptogenesis in minimal $U(1)_X$ extensions of the Standard Model

Arindam Das; Yuta Orikasa

doi:10.1016/j.physletb.2025.139395

paper

Resonant leptogenesis in minimal $U (1)_{X}$ extensions of the Standard Model

arXiv:2407.05644 · doi:10.1016/j.physletb.2025.139395

Abstract

We investigate a general $U (1)_{X}$ scenario where we introduce three generations of Standard Model (SM) singlet Right Handed Neutrinos (RHNs) to generate the light neutrino mass through the seesaw mechanism after the breaking of $U (1)_{X}$ and electroweak symmetries. In addition to that, a general $U (1)_{X}$ scenario involves an SM-singlet scalar field and due to the $U (1)_{X}$ symmetry breaking the mass of a neutral beyond the SM (BSM) gauge boson $Z^{'}$ is evolved. The RHNs, being charged under $U (1)_{X}$ scenario, can explain the origin of observed baryon asymmetry through the resonant leptogenesis process. Applying observed neutrino oscillation data we study $Z^{'}$ and BSM scalar induced processes to reproduce the observed baryon asymmetry. Hence we estimate bounds on the $U (1)_{X}$ gauge coupling $(g_{X})$ and the mass of the $Z^{'}$ $(M_{Z^{'}})$ for different $U (1)_{X}$ charges and benchmark masses of RHN and SM-singlet scalar. Finally we compare our results with limits obtained from the existing limits from LEP-II and LHC. We find that depending on the $U (1)_{X}$ charges, the masses of RHNs and SM-singlet scalar resonant leptogenesis could provide stronger limit on $g_{X}$ for $M_{Z^{'}} > 5.8$ TeV which could be probed by high energy scattering experiment in future.

13 pages, two figures

Resonant leptogenesis in minimal $U (1)_{X}$ extensions of the Standard Model

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Resonant leptogenesis in minimal U(1)X​ extensions of the Standard Model

Abstract

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Resonant leptogenesis in minimal $U (1)_{X}$ extensions of the Standard Model