Abstract
OPERA (Oscillation Project with Emulsion tRacking Apparatus) is a long-baseline neutrino experiment, designed to perform the first direct detection of νμ → ντ oscillation in appearance mode. The OPERA detector is placed in the CNGS long baseline νμ beam, 732 km away from the neutrino source. The detector, consisting of a modular target made of lead - nuclear emulsion units complemented by electronic trackers and muon spectrometers, has been conceived to select ντ charged current interactions through the observation of the outcoming tau leptons and their subsequent decays. Runs with CNGS neutrinos were carried out from 2008 to 2012. In this paper results on νμ → ντ oscillations with background estimation and statistical significance are reported.
Highlights
IntroductionIn last decades data from solar, atmospheric, reactor and accelerator neutrino experiments have established a framework of 3-flavor neutrino oscillations through the mixing of three mass eigenstates
In last decades data from solar, atmospheric, reactor and accelerator neutrino experiments have established a framework of 3-flavor neutrino oscillations through the mixing of three mass eigenstates.In the atmospheric sector, the disappearance of muon neutrinos was first established by the SuperKamiokande experiment [1] and confirmed with accelerators by K2K [2] and MINOS [3] longbaseline experiments
The OPERA experiment took data from 2008 to 2012. 3 ντ candidate were observed in the analyzed sub-sample
Summary
In last decades data from solar, atmospheric, reactor and accelerator neutrino experiments have established a framework of 3-flavor neutrino oscillations through the mixing of three mass eigenstates. The disappearance of muon neutrinos was first established by the SuperKamiokande experiment [1] and confirmed with accelerators by K2K [2] and MINOS [3] longbaseline experiments. The νμ → ντ oscillation channel seems to be the dominant one, no explicit observation of tau neutrino appearance has been confirmed so far. The OPERA experiment [4], located at the Gran Sasso underground laboratory, aims to perform the νμ → ντ appearance observation in order to confirm unambiguously the neutrino oscillation model. The neutrino beam is not optimized for it, OPERA is aiming to perform a search for subleading νμ → νe oscillations at atmospheric and high Δm2
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