Exploring nonstandard quark interactions through solar neutrino studies

Abstract

We investigate the effects of a Non-Standard Interaction (NSI) extension of the standard model of particle physics on solar neutrino flavour oscillations. This NSI model introduces a $U_{Z^{\prime }}(1)$ gauge symmetry through a $Z^{\prime }$ 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 $Z^{\prime }$ boson's mass $m_{Z^{\prime }}$ and coupling constant $g_{Z^{\prime }}$. 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 flavour 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 flavour oscillation.

arXiv comment9 pages and 5 figures

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