New bounds on neutrino electric millicharge from limits on neutrino magnetic moment

In various extensions of the Standard Model a neutrino can have nontrivial electromagnetic properties. In particular, a neutrino can be an electrically millicharged particle. The corresponding non-standard electromagnetic interactions generates additional contributions to the neutrino magnetic moment. New limit on the neutrino magnetic moment recently obtained by the GEMMA experiment on measurements of the reactor antineutrino scattering off electrons allows us to get a new upper bound on the neutrino electric millicharge $\mid q_{\nu} \mid < 5.8 \times 10^{-19} e_0$ that exceed most of the available in literature bounds on the neutrino millicharge. We also obtain the bound, $\mid q_{\nu} \mid < 6 \times 10^{-20}e_0$, from the astrophysical limit on the neutrino magnetic moment that is much stronger than all known astrophysical bounds on the millicharge. \end{abstract}