Improved limit on electron neutrino charge radius through a new evaluation of the weak mixing angle

We have obtained a new limit on the electron neutrino effective charge radius from a new evaluation of the weak mixing angle by a combined fit of all electron-(anti)neutrino electron elastic scattering measurements. Weak mixing angle is found to be sin(2) theta(W) = 0.259 +/- 0.025 in the low energy regime below 100 MeV. The electron neutrino charge radius squared is bounded to be in the range -0.13 x 10(-32) cm(2) < < r(ve)(2)> < 3.32 x 10(-32) cm(2) at 90% C.L. Both results improve previously published. analyses.,We also discuss perspectives of future experiments to improve these constraints. (C) 2008 Elsevier B.V. All rights reserved.