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

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arxiv 0707.4319 v3 pith:3UFYOAON submitted 2007-07-29 hep-ph hep-ex

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

J. Barranco , O. G. Miranda , T. I. Rashba This is my paper
classification hep-ph hep-ex
keywords electronneutrinoanglechargemixingradiusweakevaluation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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    Projections show CLOUD and TAO could improve low-energy weak mixing angle measurements to 8-11% via elastic neutrino-electron scattering, with competitive magnetic moment and NSI limits.