KM3NeT: Physics Analysis
The main goal of ARCA is neutrino astronomy, e.g. to identify point-like neutrino sources. To reach this goal, dedicated reconstruction algorithms for each neutrino interaction type and resulting event topology, e.g. track-like or cascade-like events, have to be developed. High accuracy in the determination of the neutrino arrival direction is necessary to detect sources with low intensity. The ECAP group therefore develops event classification methods employing several different machine learning algorithms. These techniques are also used to estimate ARCA's sensitivity to determine the flavor ratio of cosmic neutrinos arriving at Earth as part of the recently discovered diffuse astrophysical neutrino flux. As the first detector elements are already deployed, the group also participates in first tests with atmospheric muons.
The mass ordering of the three neutrinos of the standard model of particle phyisics is one of the most important open questions in neutrino physics. By precisely measuring the energy and zenith angle dependent flavour oscillation probabilities of atmospheric neutrinos that have traversed the Earth, one can determine if the neutrino mass ordering is normal or inverted. ORCA (Oscillation Research with Cosmics in the Abyss) is a dense future water Cherenkov detector under construction by the KM3NeT collaboration. It will be built off the coast of Southern France in the Mediterranean Sea and will measure atmospheric neutrinos in an energy range from 1 to 50 GeV.
In addition to hardware development and construction within the KM3NeT collaboration, the ECAP contributes to the development of efficient and high-resolution event reconstruction algorithms, to the development of background suppression techniques and is responsible for the development of detailed detector simulations.