Testing 3+1 and 3+2 neutrino mass models with cosmology and short baseline experiments

TL;DR

This paper combines short-baseline neutrino experiments and cosmological data to constrain sterile neutrino masses in 3+1 and 3+2 models, revealing some agreement but also tension when galaxy clustering data is included.

Contribution

It provides a comprehensive analysis of sterile neutrino models using combined experimental and cosmological data, highlighting existing tensions.

Findings

Potential agreement between oscillation and cosmological data.

Tension arises when galaxy clustering data is included.

Constraints on sterile neutrino masses are derived.

Abstract

Recent results from short--baseline neutrino oscillation experiments and Cosmic Microwave Background anisotropy measurements suggest the presence of additional sterile neutrinos. In this paper we properly combine these data sets to derive bounds on the sterile neutrino masses in the 3+1 and 3+2 frameworks, finding a potentially good agreement between the two datasets. However, when galaxy clustering is included in the analysis a tension between the oscillation and cosmological data is clearly present.