Speaker
Dr
Andrea (on behalf of the OPERA Coll.) Longhin
(INFN Laboratori Nazionali di Frascati)
Description
The OPERA experiment at the Gran Sasso underground laboratory is searching
for nu_mu -> nu_tau oscillations in appearance mode in the CNGS neutrino beam.
Four nu_tau candidate 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,
nu_mu -> nu_tau oscillations are established with a significance of 4.2 sigma.
In the talk the data analysis will be discussed, with emphasis on the background
constraints obtained by using dedicated data-driven control samples.
We will also present an analysis of the present tau neutrino and electron
neutrino sample in the framework of the 3+1 sterile model. The analysis of
the muon charge ratio in the cosmic ray sample will be also covered.
Author
Dr
Andrea (on behalf of the OPERA Coll.) Longhin
(INFN Laboratori Nazionali di Frascati)
