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# DPF2015

4-8 August 2015
America/Detroit timezone

## Results from the OPERA experiment at the CNGS beam

7 Aug 2015, 14:00
18m
Hussey (Michigan League)

### Hussey

#### Michigan League

Neutrino Experiment

### Speaker

Dr Tomohiro Hayakawa (Nagoya University)

### Description

The OPERA experiment at the Gran Sasso underground laboratory has been designed to study the $\nu_\mu \to \nu_\tau$ oscillation in appearance mode in the CNGS neutrino beam. Four $\nu_\tau$ candidate events have been confirmed so far, using a sub-sample of data from the 2008-2012 runs. Given the number of analysed events and the low background, $\nu_\mu \to \nu_\tau$ oscillations have been established with a significance of 4.2 sigma. In the talk we will present results based on an increased sample of scanned emulsion target units (bricks). The $\nu_\tau$ data analysis will be updated and discussed, with emphasis on the background constraints obtained by using dedicated data-driven control samples. The analysis of the present tau neutrino and electron neutrino samples in the framework of the 3+1 sterile model will be presented.
Oral or Poster Presentation Oral

### Primary author

Dr Tomohiro Hayakawa (Nagoya University)

### Co-author

Prof. Koichi Kodama (Aichi University of Education)