Results from the OPERA experiment at the CNGS beam

4th Symposium on Prospects in the Physics of Discrete Symmetries

Longhin, A.^1

via Fermi 40, Frascati, Rome

00044, Italy^1

关键词: Data-driven control;    Electron neutrino;    Low background;    Muon charge ratio;    Neutrino beams;    Sterile neutrinos;    Tau neutrinos;    Underground laboratory;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/631/1/012056/pdf
DOI  :  10.1088/1742-6596/631/1/012056

来源: IOP

【 摘 要 】

The OPERA experiment at the Gran Sasso underground laboratory is searching for νμ→ ντoscillations in appearance mode in the CNGS neutrino beam. Four ντcandidate events have been found so far, using a sub-sample of data from the 2008-2012 runs. Given the number of analysed events and the low background, νμ→ ντoscillations are established with a significance of 4.2 σ. In this paper the data analysis is discussed, with emphasis on the background constraints obtained using dedicated data-driven control samples. We present also the analysis of the τ neutrino and electron neutrino data in the framework of the 3+1 sterile neutrino model. The measurement of the muon charge ratio in the collected cosmic ray sample is also reported.