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 |Uα4|2, with α∈(e,μ,τ), and the mass-squared splitting Δm412≡m42-m12. 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 |Uα4|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.

Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches / Hagstotz, Steffen; de Salas, Pablo F.; Gariazzo, Stefano; Pastor, Sergio; Gerbino, Martina; Lattanzi, Massimiliano; Vagnozzi, Sunny; Freese, Katherine. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 104:12(2021), p. 123524. [10.1103/physrevd.104.123524]

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

Sunny Vagnozzi;
2021-01-01

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 |Uα4|2, with α∈(e,μ,τ), and the mass-squared splitting Δm412≡m42-m12. 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 |Uα4|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.
2021
12
Hagstotz, Steffen; de Salas, Pablo F.; Gariazzo, Stefano; Pastor, Sergio; Gerbino, Martina; Lattanzi, Massimiliano; Vagnozzi, Sunny; Freese, Katherine
Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches / Hagstotz, Steffen; de Salas, Pablo F.; Gariazzo, Stefano; Pastor, Sergio; Gerbino, Martina; Lattanzi, Massimiliano; Vagnozzi, Sunny; Freese, Katherine. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 104:12(2021), p. 123524. [10.1103/physrevd.104.123524]
File in questo prodotto:
File Dimensione Formato  
PhysRevD.104.123524.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 912.35 kB
Formato Adobe PDF
912.35 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/360223
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 32
social impact