Impact of lepton flavor universality violation on CP-violation sensitivity of long-baseline neutrino oscillation experiments

Abstract

The observation of neutrino oscillation as well as the recent experimental results on lepton flavor universality (LFU) violation in B meson decays are indications of new physics beyond the standard model. Many theoretical models, which are introduced in the literature as an extension of SM to explain these observed deviations in LFU, lead to a new kind of interactions, the so-called non-standard interaction (NSI) between the elementary particles. In this paper, we consider a model with an additional Z boson (which is quite successful in explaining the observed LFU anomalies) and analyze its effect in the lepton flavor violating (LFV) B d → τ ± e ∓ decay modes. From the present upper bound of the B d → τ ± e ∓ branching ratio, we obtain the constraints on the new physics parameters, which are related to the corresponding NSI parameters in the neutrino sector by SU (2) L symmetry. These new parameters are expected to have potential implications in the neutrino oscillation studies and in this work we investigate the possibility of observing the effects of these interactions in the currently running and upcoming long-baseline experiments, i.e., NOνA and DUNE, respectively.

Degeneracy between θ23 octant and neutrino non-standard interactions at DUNE

“…It is still induced by the new CP-phases related to NSI's, but concerns the octant of the atmospheric mixing angle θ 23 . Such a degeneracy has been noted in the numerical simulations performed in [21,22,23] and also briefly discussed at the analytical level in [11] (see also [9,16]). But, to the best of our knowledge, it has not been addressed in a systematic way in the literature.…”

“…CP-violation (CPV) related to the 3-flavor CP-phase δ and the dynamical CP-phases implied by neutral-current flavorchanging NSI's has received much attention [9,10,11,12,13,14,15,16,17] 1 .…”

Searching for BSM neutrino interactions in dark matter detectors

“…Searching for BSM neutrino interactions is of increasing importance since they could make a considerable impact on future precision oscillation measurements. For example, it is known that the Non-Standard Interactions [1][2][3][4] of neutrinos may affect the measurement of δ CP in long-baseline oscillation experiments [5][6][7][8][9][10][11][12]. Moreover, due to various well-known problems of the SM, theorists have for decades been looking for more satisfactory theories.…”

Report on scipost_201909_00005v1

“…For example, neutrinos may have different kind of new interactions, popularly known as neutrino non-standard interactions (NSI) [1]. In the past few years the work on NSI in the context of LBL experiments have received a lot of attention [13,28,30,252,[347][348][349][350][351][352][353][354][355][356]]. Here we discuss in detail the impact of non-diagonal flavor changing NSIs (specifically ε eµ and ε eτ taken one at a time) on the resolution of the octant of θ 23 taking DUNE [23] as a case study.…”