Resolving the LMA-dark NSI degeneracy with coherent neutrino-nucleus scattering

Journal of High Energy Physics

Thomas Schwetz¹  Mariano Chaves² 

[1] Institut für Astroteilchenphysik, Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany;Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil;Institut für Astroteilchenphysik, Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany;

关键词: Beyond Standard Model;    Neutrino Detectors and Telescopes (experiments);    Electroweak interaction;    Flavor physics;   

DOI  :  10.1007/JHEP05(2021)042

来源: Springer

【 摘 要 】

In the presence of non-standard neutrino interactions (NSI), a degeneracy exists in neutrino oscillation data, which involves the flipping of the octant of the mixing angle θ12 and the type of the neutrino mass ordering. In this article, we revisit the status of this degeneracy in the light of recent data on coherent elastic neutrino-nucleus scattering (CEνNS) from the COHERENT experiment. For general relative couplings to up and down quarks, the degeneracy is disfavoured at the 2σ level by the latest data but remains at a higher confidence level. We investigate the requirements of future CEνNS measurements to resolve the degeneracy with high significance. We find that a measurement involving both, electron and muon neutrino flavours and a target with a neutron-to-proton ratio close to 1 is required. For example, an experiment with a silicon target at the European Spallation Source can resolve the degeneracy at more than 4σ for arbitrary relative couplings to up and down quarks.

【 授权许可】

CC BY