Exploring nonstandard quark interactions through solar neutrino studies

We investigate the effects of a nonstandard interaction (NSI) extension of the standard model of particle physics on solar neutrino flavor oscillations. This NSI model introduces a UZ'(1) gauge symmetry through a Z' boson that mixes with the photon, creating a neutral current between active neutrinos and matter fields via a unique coupling to up and down quarks. The interaction is defined by a single parameter, & zeta;o, which is related to the Z' boson's mass mZ'and coupling constant gZ'. Notably, this model relaxes the bounds on coherent elastic neutrino-nucleus scattering experiments and fits the experimental values of the anomalous magnetic dipole moment of the muon. In this study, we use solar neutrino measurements and an up-to-date standard solar model to evaluate the neutrino flavor oscillations and assess the constraints on & zeta;o. Our study indicates that the NSI model aligns with the current solar neutrino data when & zeta;o is between -0.7 and 0.002. These models have & chi;& nu;2 values equal to or better than the standard neutrino flavor oscillation model, which stands at a & chi;& nu;2 of 3.12. The best NSI model comes with a & zeta;o value of -0.2 and a & chi;& nu;2 of 2.96. Including extra data from the Darwin experiment in our analysis refines the range of & zeta;o values from -0.7 to 0.002, down to -0.5 to -0.002. These results hint at the possible existence of novel interactions, given that NSI models achieve a comparable or superior fit to the solar neutrino data when contrasted with the prevailing standard model of neutrino flavor oscillation.