Search for electron-neutrino transitions to sterile states in the BEST experiment

This is the authors' abstract. We don't add key points for this paper.

First results from the BEST Collaboration searching for short-baseline neutrino oscillations to sterile neutrinos with a high-intensity ⁵¹Cr monoenergetic neutrino source reaffirm that the so-called gallium anomaly, a deficit in electron neutrinos, persists. 4σ deficits were observed in the ⁷¹Ge production rates at two different distance scales, which could be interpreted as oscillations between an electron neutrino and a hypothetical sterile neutrino. The results are consistent with oscillations with a mass squared difference above about 0.5 eV² and a large mixing angle sin²0.167em0ex2θ≈0.4.