Speaker
Description
Speaker: Aldo Ianni
Abstract: Non-standard neutrino interactions (NSIs) provide a powerful probe of physics beyond the Standard Model. In this talk, we present a search for neutrino--electron NSIs using data collected with the Borexino detector.
Thanks to its exceptionally low radioactive background and high sensitivity to low-energy solar neutrinos, Borexino offers a unique opportunity to investigate NSIs, particularly through the monoenergetic 0.862 MeV 7Be solar neutrinos.
After a brief overview of the Borexino detector, we describe the analysis strategy employed to search for neutrino--electron NSIs. The analysis is sensitive to all 12 neutrino--electron NSI coupling parameters, comprising six left-handed and six right-handed couplings.
Despite the large parameter space, the Borexino spectral analysis allows all 12 NSI parameters to be fitted simultaneously, yielding competitive constraints that are consistent with the Standard Model expectation of vanishing NSI couplings.