2017/01/31 by Pilar Coloma, Peter B. Denton, M. C. Gonzalez-Garcia +2 · 120 citations
Physics and Astronomy · #CP violation #Charm (quantum number) #Dark Matter and Cosmic Phenomena #Degeneracy (biology) #Electroweak interaction #Measurements of neutrino speed #Neutrino #Neutrino Physics Research #Neutrino oscillation #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep04(2017)116
published in Journal of High Energy Physics 2017(4) (Springer Nature) · 33 pages, 9 figures. Minor modifications. Version accepted for publication in JHEP
openalex created_date 2017/02/03 · openalex publication_date 2017/04/01 · arxiv created 2017/04/20 · arxiv updated 2017/05/24 · openalex updated_date 2026/08/05
In presence of non-standard neutrino interactions the neutrino flavor evolution equation is affected by a degeneracy which leads to the so-called LMA-Dark solution. It requires a solar mixing angle in the second octant and implies an ambiguity in the neutrino mass ordering. Non-oscillation experiments are required to break this degeneracy. We perform a combined analysis of data from oscillation experiments with the neutrino scattering experiments CHARM and NuTeV. We find that the degeneracy can be lifted if the non-standard neutrino interactions take place with down quarks, but it remains for up quarks. However, CHARM and NuTeV constraints apply only if the new interactions take place through mediators not much lighter than the electroweak scale. For light mediators we consider the possibility to resolve the degeneracy by using data from future coherent neutrino-nucleus scattering experiments. We find that, for an experiment using a stopped-pion neutrino source, the LMA-Dark degeneracy will either be resolved, or the presence of new interactions in the neutrino sector will be established with high significance.