Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches
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Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches

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Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches

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dc.contributor.author Hagstotz, Steffen
dc.contributor.author Fernández de Salas, Pablo
dc.contributor.author Gariazzo, Stefano
dc.contributor.author Pastor Carpi, Sergio
dc.contributor.author Gerbino, Martina
dc.contributor.author Lattanzi, Massimiliano
dc.contributor.author Vagnozzi, Sunny
dc.contributor.author Freese, Katherine
dc.date.accessioned 2022-05-03T14:15:11Z
dc.date.available 2022-05-03T14:15:11Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/10550/82539
dc.description.abstract We present a consistent framework to set limits on properties of light sterile neutrinos coupled to all three active neutrinos using a combination of the latest cosmological data and terrestrial measurements from oscillations, β-decay, and neutrinoless double-β-decay (0νββ) experiments. We directly constrain the full 3+1 active-sterile mixing matrix elements |U_α4|^2, with α∈(e,μ,τ), and the mass-squared splitting Δm^2_41≡m^2_4−m^2_1. We find that results for a 3+1 case differ from previously studied 1+1 scenarios where the sterile is coupled to only one of the neutrinos, which is largely explained by parameter space volume effects. Limits on the mass splitting and the mixing matrix elements are currently dominated by the cosmological datasets. The exact results are slightly prior dependent, but we reliably find all matrix elements to be constrained below |U_α4|^2≲10^−3. Short-baseline neutrino oscillation hints in favor of eV-scale sterile neutrinos are in serious tension with these bounds, irrespective of prior assumptions. We also translate the bounds from the cosmological analysis into constraints on the parameters probed by laboratory searches, such as mβ or mββ, the effective mass parameters probed by β-decay and 0νββ searches, respectively. When allowing for mixing with a light sterile neutrino, cosmology leads to upper bounds of mβ<0.09  eV and mββ<0.07  eV at 95% CL, more stringent than the limits from current laboratory experiments.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2021, vol. 104, num. 12, p. 123524-1-123524-20
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Hagstotz, Steffen Fernández de Salas, Pablo Gariazzo, Stefano Pastor Carpi, Sergio Gerbino, Martina Lattanzi, Massimiliano Vagnozzi, Sunny Freese, Katherine 2021 Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches Physical Review D 104 12 123524-1 123524-20
dc.subject Cosmologia
dc.subject Astrofísica
dc.title Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches
dc.type info:eu-repo/semantics/article
dc.date.updated 2022-05-03T14:15:12Z
dc.identifier.doi https://doi.org/10.1103/PhysRevD.104.123524
dc.identifier.idgrec 152257

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