  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.
