2023/10/27 by Cherchiglia, Adriano, Pasquini, Pedro, Peres, O. L. G. +3
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2310.18401
Since neutrino oscillation was observed, several experiments have been built to measure its parameters. NOνA and T2K are two long-baseline experiments dedicated to measuring mainly the mixing angle θ23, the charge-parity conjugation phase δ\rm 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 NOνA. 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 (QFT) formalism, where we derive perturbative analytical formulae considering CC-NSI in the pion decay. Within this new approach, we can alleviate NOνA and T2K tension for a CC-NSI complex parameters of order 10-3. We show the new phase has a degeneracy to the Dirac CP phase of the form δ\rm CP ± ϕ= 1.5π being a possible source of violation of charge-parity symmetry.