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

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

2007-07-29

arxiv.org/abs/0707.4319v3

Phys.Lett.B662:431-435,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures. Final published version

Scientific paper

10.1016/j.physletb.2008.03.039

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 \pm 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 10^-32 cm^2 < r^2 < 3.32 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.

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