Direct comparison of sterile neutrino constraints from cosmological data, $$\nu _{e}$$ disappearance data and $$\nu _{\mu } \rightarrow \nu _{e} $$ appearance data in a $$3+1$$ model

• Published in: The European physical journal. C, Particles and fields Vol. 80; no. 8
• Main Authors: Adams, Matthew, Bezrukov, Fedor, Elvin-Poole, Jack, Evans, Justin J., Guzowski, Pawel, Fearraigh, Brían Ó, Söldner-Rembold, Stefan
• Format: Journal Article
• Language: English
• Published: 01.08.2020
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-020-8197-y

Abstract We present a quantitative, direct comparison of constraints on sterile neutrinos derived from neutrino oscillation experiments and from Planck data, interpreted assuming standard cosmological evolution. We extend a $$1+1$$ 1 + 1 model, which is used to compare exclusion contours at the 95% Cl derived from Planck data to those from $$\nu _{e}$$ ν e -disappearance measurements, to a $$3+1$$ 3 + 1 model. This allows us to compare the Planck constraints with those obtained through $$\nu _{\mu }\rightarrow \nu _{e}$$ ν μ → ν e appearance searches, which are sensitive to more than one active-sterile mixing angle. We find that the cosmological data fully exclude the allowed regions published by the LSND, MiniBooNE and Neutrino-4 collaborations, and those from the gallium and rector anomalies, at the 95% Cl. Compared to the exclusion region from the Daya Bay $$\nu _{e}$$ ν e -disappearance search, the Planck data are more strongly excluding above $$|\Delta m^{2}_{41}|\approx 0.1\,\mathrm {eV}^{2}$$ | Δ m 41 2 | ≈ 0.1 eV 2 and $$m_\mathrm {eff}^\mathrm {sterile}\approx 0.2\,\mathrm {eV}$$ m eff sterile ≈ 0.2 eV , with the Daya Bay exclusion being stronger below these values. Compared to the combined Daya Bay/Bugey/MINOS exclusion region on $$\nu _{\mu }\rightarrow \nu _{e}$$ ν μ → ν e appearance, the Planck data is more strongly excluding above $$\Delta m^{2}_{41}\approx 5\times 10^{-2}\,\mathrm {eV}^{2}$$ Δ m 41 2 ≈ 5 × 10 - 2 eV 2 , with the exclusion strengths of the Planck data and the Daya Bay/Bugey/MINOS combination becoming comparable below this value.