Abstract :
We calculate bounds on neutrino magnetic moment and charge radius squared from solar neutrinos observations after Super-Kamiokande and SNO results. We use LSND νe–e elastic scattering measurement to constrain further the charge radius. With few assumptions, we derive μν ⩽ 1 × 10−10μB (μν ⩽ 1.2 × 10−10μB), when 〈r2〉 = 0, and −1.2 × 10−32 ⩽ 〈r2〉 ⩽ 2.7 × 10−32 cm2 (−0.5 × 10−32 ⩽ 〈r2〉 ⩽ 3.5 × 10−32 cm2), when μν = 0, at 90% C.L. for Dirac (Majorana) neutrinos. We also show that μν cannot be larger than 1.2 × 10−10μB for any allowed value of the charge radius. Moreover, we show that from our fit a fraction of about 1.3% of νxR (x = μ,τ) could be present in the solar neutrinos flux on Earth.
