Alleviating the present tension between T2K and NO ν A with nonstandard neutrino interactions
Year: 2025
Type: article
Abstract: Since neutrino oscillation was observed, several experiments have been built to measure its parameters. NuMI Off-axis ν e Appearance ( NO ν A ) and Tokai-to-Kamioka (T2K) are two long-baseline experiments dedicated to measuring mainly the mixing angle θ 23 , the charge-parity ( C P ) conjugation phase δ CP , and the mass ordering. However, there is a tension in current data. The T2K allowed region is in conflict with the region allowed by NO ν A . We propose a nonstandard charged current interaction (CC-NSI) in neutrino production to relieve this tension. The CC-NSI is computed through quantum field theory formalism, where we derive perturbative analytical formulae considering CC-NSI in the pion decay. Within this new approach, we can alleviate NO ν A and T2K tension for CC-NSI complex parameters of order 10 − 3 . We show the new phase has a degeneracy to the Dirac C P phase of the form δ CP ± ϕ = 1.5 π , being a possible source of violation of charge-parity symmetry.
DOI: 10.1103/55qm-zbhv
Language: English
Topic: Neutrino Physics Research
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Shanghai Jiao Tong University, Universidade Estadual de Campinas, Japan Society for the Promotion of Science, Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
Awards: G1207375514, G1391264164, G1918605731, G2147257319, G224182835, G2422501176, G29316538, G2944604955, Photon detection system of the Deep Underground Neutrino Experiment, G3572101131, G4005441569, G4129341838, Beyond the standard model in neutrino experiments, Challenges in the 21st century in neutrino physics and astrophysics, G4978543202, G5010505560, G5476631443, G5761682676, Advanced Instrumentation for large facilities in High Energy Physics: LAr purification and Photodetection for LBNF-DUNE, G6438247056, G674653633, G6756993358, G70864488, G871200192
OpenAlex ID: W4416176325