Zobrazeno 1 - 10
of 729
pro vyhledávání: '"Vatsyayan"'
We consider an extended seesaw model which generates active neutrino masses via the usual type-I seesaw and leads to a large number of massless fermions as well as a sterile neutrino dark matter (DM) candidate in the $\mathcal{O}(10-100) {\rm~keV}$ m
Externí odkaz:
http://arxiv.org/abs/2410.23926
Publikováno v:
JCAP 06 (2024) 029
We analyse a model that connects the neutrino sector and the dark sector of the universe via a mediator $\Phi$, stabilised by a discrete $Z_4$ symmetry that breaks to a remnant $Z_2$ upon $\Phi$ acquiring a non-zero vacuum expectation value ($v_\phi$
Externí odkaz:
http://arxiv.org/abs/2312.15053
Publikováno v:
Eur. Phys. J. C 84, 803 (2024)
With just the Standard Model Higgs doublet, there are only three types of seesaw models that generate light Majorana neutrino masses at tree level after electroweak spontaneous symmetry breaking. However, if there exist additional TeV scalars acquiri
Externí odkaz:
http://arxiv.org/abs/2312.14119
Publikováno v:
J. High Energ. Phys. 2024, 55 (2024)
The unique dimension-$5$ effective operator, $LLHH$, known as the Weinberg operator, generates tiny Majorana masses for neutrinos after electroweak spontaneous symmetry breaking. If there are new scalar multiplets that take vacuum expectation values
Externí odkaz:
http://arxiv.org/abs/2312.13356
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 8, Pp 1-19 (2024)
Abstract With just the Standard Model Higgs doublet, there are only three types of seesaw models that generate light Majorana neutrino masses at tree level after electroweak spontaneous symmetry breaking. However, if there exist additional TeV scalar
Externí odkaz:
https://doaj.org/article/6a3f8c9593b649e28224dd9c3a2e4190
Publikováno v:
J. High Energ. Phys. 2023, 49 (2023)
The observed dark matter relic abundance may be explained by different mechanisms, such as thermal freeze-out/freeze-in, with one or more symmetric/asymmetric components. In this work we investigate the role played by asymmetries in determining the y
Externí odkaz:
http://arxiv.org/abs/2301.13238
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-37 (2024)
Abstract The unique dimension-5 effective operator, LLHH, known as the Weinberg operator, generates tiny Majorana masses for neutrinos after electroweak spontaneous symmetry breaking. If there are new scalar multiplets that take vacuum expectation va
Externí odkaz:
https://doaj.org/article/8f6992cfe78b47bf9cf35ebe36481a5c
Autor:
Vatsyayan, Drona, Goswami, Srubabati
Publikováno v:
Phys. Rev. D 107, 035014 (2023)
In this paper, we consider the possibility of generating the observed baryon asymmetry of the Universe via leptogenesis in the context of triplet fermion mediated type-III seesaw model of neutrino mass. With a hierarchical spectrum of the additional
Externí odkaz:
http://arxiv.org/abs/2208.12011
Publikováno v:
J. High Energ. Phys. 2022, 75 (2022)
We study the relic abundance of several stable particles from a generic dark sector, including the possible presence of dark asymmetries. After discussing the different possibilities for stabilising multi-component dark matter, we analyse the final r
Externí odkaz:
http://arxiv.org/abs/2207.02874