The search for tau neutrinos with MAGIC telescopes

Abstract - n the multi-messenger era of Astronomy, the detection of neutrinos is quickly gaining its well-deserved importance: the broadband spectral energy distributions (SED) of astrophysical sources can be enriched by the presence of neutrinos emitted simultaneously to other wavebands. Neutrinos can be detected by ad-hoc experiments such as IceCube, ANTARES (Neutrino Telescope and Abyss environmental RESearch), Super-K (Super-Kamioka Neutrino Detection Experiment) and others, but recent results from the MAGIC Collaboration have shown that Imaging Atmosphere Cherenkov telescopes (IACTs) as MAGIC (Major Atmospheric Gamma-ray Cherenkov telescope) devoted to the study of very-high-energy gamma-rays are able to detect showers induced by earth-skimming neutrinos. Special simulations were recently developed to perform this peculiar analysis. In this work we analyse ~40 hours of data, taken by MAGIC telescopes when pointing to the Sea, using Monte Carlo simulations consisting of ANIS (All Neutrino Interaction Simulation), CORSIKA (COsmic Ray SImulations for KAscade) and MARS software. The selection criteria has been created with the support of Fisher discriminant analysis and the Genetic algorithm. These criteria can be applied to every sample of MAGIC data taken on very high zenith angles, making the next analysis on new data faster and more efficient. The analysis of tau neutrino induced shower is a non-standard procedure, and would largely benefit by the application of the here described procedure.