Constraints on Non-Standard Neutrino Interactions and Unparticle Physics with Neutrino-Electron Scattering at the Kuo-Sheng Nuclear Power Reactor

TL;DR

This study uses neutrino-electron scattering data from a nuclear reactor to set new limits on non-standard neutrino interactions and unparticle physics, testing physics beyond the Standard Model.

Contribution

It provides the first constraints on NSI parameters and unparticle couplings using reactor neutrino data, enhancing the understanding of potential new physics scenarios.

Findings

New bounds on NSI parameters ($ ilde{ ext{e}}_L$, $ ilde{ ext{e}}_R$, $ ilde{ ext{e}}_{L ext{F}}$, $ ilde{ ext{e}}_{R ext{F}}$)

Constraints on scalar and vector unparticle couplings ($ ext{lambda}_0$, $ ext{lambda}_1$)

Improved limits on physics beyond the Standard Model from reactor neutrino experiments.

Abstract

Neutrino-electron scatterings are purely leptonic processes with robust Standard Model (SM) predictions. Their measurements can therefore provide constraints to physics beyond SM. The $\nuebar$-e data taken at the Kuo-Sheng Reactor Neutrino Laboratory were used to probe two scenarios: Non-Standard Neutrino Interactions (NSI) and Unparticle Physics. New constraints were placed to the NSI parameters ($\el$,$\er$) and ($\etl$,$\etr$) for the Non-Universal and Flavor-Changing channels, respectively, as well as to the coupling constants for scalar ($\lambda_0$) and vector ($\lambda_1$) unparticles to the neutrinos and electrons.