https://doi.org/10.1140/epjc/s10052-024-12440-2
Regular Article - Theoretical Physics
Observable
in Dirac scotogenic model
1
Department of Physics, Indian Institute of Technology, 781039, Guwahati, Assam, India
2
School of Physics, Korea Institute for Advanced Study, 02455, Seoul, South Korea
Received:
9
October
2023
Accepted:
11
January
2024
Published online:
8
February
2024
We study the possibility of probing the radiative Dirac seesaw model with dark sector particles going inside the loop, popularly referred to as the Dirac scotogenic model via measurements of effective relativistic degrees of freedom at cosmic microwave background (CMB) experiments. The loop suppression and additional free parameters involved in neutrino mass generation allow large
coupling of light Dirac neutrinos with the dark sector particles. Such large Yukawa coupling not only dictates the relic abundance of heavy fermion singlet dark matter but also can lead to the thermalisation of the right chiral part of Dirac neutrinos, generating additional relativistic degrees of freedom
We find that the parameter space consistent with dark matter phenomenology and neutrino mass bounds can also be probed at future cosmic microwave background experiments like CMB-S4 via precision measurements of
The same parameter space, while leading to loop-suppressed direct detection cross-section of dark matter outside future sensitivities, can also have other interesting and complementary observational prospects via charged lepton flavour violation and collider signatures.
© The Author(s) 2024
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