Constraints on Scalar-Pseudoscalar and Tensorial Non-Standard Interaction and Tensorial Unparticle Couplings from Neutrino-Electron Scattering

TL;DR

This paper sets new constraints on non-standard neutrino interactions and tensorial unparticle couplings using neutrino-electron scattering data from TEXONO and LSND experiments, enhancing the understanding of physics beyond the Standard Model.

Contribution

It provides the first model-independent limits on scalar, pseudoscalar, and tensorial neutrino interactions and tensorial unparticle couplings from low-energy scattering data.

Findings

Established upper limits on non-standard interaction couplings at 90% CL.

Derived bounds on tensorial unparticle physics parameters.

Analyzed data from TEXONO and LSND experiments for new constraints.

Abstract

Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model, especially at the low energy-momentum transfer regime. We derived constraints on neutrino nonstardard interaction couplings depending on model-independent approaches which are described by a four-Fermi pointlike interaction and unparticle physics model with tensorial components. Data on $\bar{\nu}_{e}-e$ and $\nu_{e}-e$ scattering from the TEXONO and LSND experiments, respectively, are used. The upper limits and the allowed regions of scalar, pseudoscalar, and tensorial nonstandard interaction couplings of neutrinos are derived at 90\% confidence level in both one-parameter and two-parameter analysis. New upper limits for tensorial unparticle physics coupling constants and mass parameters are also placed.