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We are grateful to Carlos Arguelles, Janet Conrad, and William Louis for useful discussions. We thank Gavin Davies for help in implementing the NOvA results. The work of JK and MD has been supported by the German Research Foundation (DFG) under Grant Nos. KO 4820/1-1, FOR 2239, EXC-1098 (PRISMA) and by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. 637506, vDirections). The work of MM and IMS has been supported by the Spanish government through MINECO/FEDER-UE grants FPA2015-65929-P and FPA2016-78645-P, as well as the Severo Ochoa program grant SEV-2016-0597 of IFT. This project has received support from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreements No. 690575 (InvisiblesPlus) and No. 674896 (Elusives). This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

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Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos

Publicado en:Journal Of High Energy Physics. 2018 (8): - 2018-08-01 2018(8), DOI: 10.1007/JHEP08(2018)010

Autores: Dentler, Mona; Hernandez-Cabezudo, Alvaro; Kopp, Joachim; Machado, Pedro; Maltoni, Michele; Martinez-Soler, Ivan; Schwetz, Thomas;

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We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3+1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS and NEOS reactor experiments support the sterile neutrino explanation of the reactor anomaly, based on an analysis that relies solely on the relative comparison of measured reactor spectra. Global data from the nu(e) disappearance channel favour sterile neutrino oscillations at the 3 sigma level with Delta m(41)(2) approximate to 1.3 eV(2) and vertical bar U-e4 vertical bar approximate to 0.1, even without any assumptions on predicted reactor fluxes. In contrast, the anomalies. in the nu(e) appearance channel (dominated by LSND) are in strong tension with improved bounds on nu(mu) disappearance, mostly driven by MINOS+ and IceCube. Under the sterile neutrino oscillation hypothesis, the p-value for those data sets being consistent is less than 2.6 x 10(-6). Therefore, an explanation of the LSND anomaly in terms of sterile neutrino oscillations in the 3+1 scenario is excluded at the 4.7 sigma level. This result is robust with respect to variations in the analysis and used data, in particular it depends neither on the theoretically predicted reactor neutrino fluxes, nor on constraints from any single experiment. Irrespective of the anomalies, we provide updated constraints on the allowed mixing strengths vertical bar U-alpha 4 vertical bar (alpha = e, mu, tau) of active neutrinos with a fourth neutrino mass state in the eV range.

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