DellUniversity Bologna

Castel Guelfo di Bologna, Italy

DellUniversity Bologna

Castel Guelfo di Bologna, Italy

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Anokhina A.,Moscow State University | Bagulya A.,RAS Lebedev Physical Institute | Benettoni M.,National Institute of Nuclear Physics, Italy | Bernardini P.,Delluniversity Salento | And 76 more authors.
European Physical Journal C | Year: 2017

The NESSiE Collaboration has been setup to undertake a conclusive experiment to clarify the muon-neutrino disappearance measurements at short baselines in order to put severe constraints to models with more than the three-standard neutrinos. To this aim the current FNAL-Booster neutrino beam for a Short-Baseline experiment was carefully evaluated by considering the use of magnetic spectrometers at two sites, near and far ones. The detector locations were studied, together with the achievable performances of two OPERA-like spectrometers. The study was constrained by the availability of existing hardware and a time-schedule compatible with the undergoing project of multi-site Liquid–Argon detectors at FNAL. The settled physics case and the kind of proposed experiment on the Booster neutrino beam would definitively clarify the existing tension between the νμ disappearance and the νe appearance/disappearance at the eV mass scale. In the context of neutrino oscillations the measurement of νμ disappearance is a robust and fast approach to either reject or discover new neutrino states at the eV mass scale. We discuss an experimental program able to extend by more than one order of magnitude (for neutrino disappearance) and by almost one order of magnitude (for antineutrino disappearance) the present range of sensitivity for the mixing angle between standard and sterile neutrinos. These extensions are larger than those achieved in any other proposal presented so far. © 2017, The Author(s).


Agafonova N.,RAS Institute for Nuclear Research | Aleksandrov A.,National Institute of Nuclear Physics, Italy | Anokhina A.,Moscow State University | Aoki S.,Kobe University | And 192 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

The OPERA experiment is designed to search for νμ→ντ oscillations in appearance mode, i.e., through the direct observation of the τ lepton in ντ-charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two ντ candidates with a τ decaying into hadrons were observed in a subsample of data of the 2008-2011 runs. Here we report the observation of a third ντ candidate in the τ-→μ- decay channel coming from the analysis of a subsample of the 2012 run. Taking into account the estimated background, the absence of νμ→ντ oscillations is excluded at the 3.4σ level. © 2014 American Physical Society.

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