The neutrino factory: beam and experiments

The discovery of neutrino oscillations marks a major milestone in the history of neutrino physics, and opens a new window to the still mysterious origin of masses and flavour-mixing. Many current and forthcoming experiments will answer open questions; however, a major step forward, up to and possibly including CP violation in the neutrino-mixing matrix, requires the neutrino beams from a \nf .The \nf\ is a new concept for producing neutrino beams of unprecedented quality in terms of intensity, flavour composition, and precision of the beam parameters. Most importantly,the \nf\ is the only known way to generate a high-intensity beam of electron neutrinos of high energy. The neutrino beam from a \nf , in particular the electron-neutrino beam enables the exploration of otherwise inaccessibledomains in neutrino oscillation physics by exploiting baselines ofplanetary dimensions. Suitable detectors pose formidable challenges butseem within reach with only moderate extrapolations from existingtechnologies. Although the main physics attraction of the \nf\ is in thearea of neutrino oscillations, an interesting spectrum of further opportunitiesranging from high-precision, high-rate neutrino scattering to physics withhigh-intensity stopped muons comes with it

Search for magnetically-induced signatures in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory

We search for signals of magnetically-induced effects in the arrival directions of ultra-high-energy cosmic rays detected at the Pierre Auger Observatory. We apply two different methods. One is a search for sets of events that show a correlation between their arrival direction and the inverse of their energy, which would be expected if they come from the same point-like source, they have the same electric charge and their deflection is relatively small and coherent. We refer to these sets of events as "multiplets". The second method, called "thrust", is a principal axis analysis aimed to detect the elongated patterns in a region of interest. We study the sensitivity of both methods using a benchmark simulation and we apply them to data in two different searches. The first search is done assuming as source candidates a list of nearby active galactic nuclei and starburst galaxies. The second is an all-sky blind search. We report the results and we find no statistically significant features. We discuss the compatibility of these results with the indications on the mass composition inferred from data of the Pierre Auger Observatory. © 2020 IOP Publishing Ltd and Sissa Medialab