Search for electron-neutrino transitions to sterile states in the BEST experiment
Physical review. C2022Vol. 105(6)
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V. V. Barinov, S. N. Danshin, В. Н. Гаврин, V. V. Gorbachev, Dmitry Gorbunov, Т. В. Ибрагимова, Yu. P. Kozlova, L. Kravchuk, V. V. Kuzminov, Б. К. Лубсандоржиев, Yury Malyshkin, I. N. Mirmov, A. A. Shikhin, E. P. Veretenkin, B. T. Cleveland, H. Ejiri, S. R. Elliott, I. Kim, R. Massarczyk, D. Frekers, W. C. Haxton, В. А. Матвеев, G. V. Trubnikov, J. S. Nico, A. L. Petelin, V. A. Tarasov, A. I. Zvir, R. G. H. Robertson, D. Sinclair, J. F. Wilkerson
Abstract
First results from the BEST Collaboration searching for short-baseline neutrino oscillations to sterile neutrinos with a high-intensity ${}^{51}$Cr monoenergetic neutrino source reaffirm that the so-called gallium anomaly, a deficit in electron neutrinos, persists. $4\ensuremath{\sigma}$ deficits were observed in the ${}^{71}$Ge 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 eV${}^{2}$ and a large mixing angle ${\mathrm{sin}}^{2}\phantom{\rule{0.167em}{0ex}}2\ensuremath{\theta}\ensuremath{\approx}0.4$.