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In the minimal Standard Model (MSM) with three generations of quarks andleptons, neutrinos can have tiny charges consistent with electromagnetic gaugeinvariance. There are three types of non-standard electric charge, given by$Q_{st} + \epsilon(L_i - L_j)$, where $i, j = e, \mu, \tau$ $(i \neq j)$,$Q_{st}$ is standard electric charge, $L_i$ is a family-lepton--number, and$\epsilon$ is an arbitrary parameter which is put equal to zero in the usualincarnation of the MSM. These three non-standard electric charges are ofconsiderable theoretical interest because they are compatible with the MSMLagrangian and $SU(3)_c \otimes SU(2)_L \otimes U(1)_Y$ gauge anomalycancellation. The two most conspicuous implications of such non-standardelectric charges are the presence of two generations of massless chargedneutrinos and a breakdown in electromagnetic universality for $e$, $\mu$ and$\tau$. We use results from (i) charge conservation in $\beta$-decay, (ii)physical consequences of charged atoms in various contexts, (iii) the anomalousmagnetic moments of charged leptons, (iv) neutrino-electron scattering, (v)energy loss in red giant and white dwarf stars, and (vi) limits on acosmologically induced thermal photon mass, to place bounds on $\epsilon$.While the constraints derived for $\epsilon$ 10^{-21}$), the $L_{\mu}-L_{\tau}$case allows $\epsilon$ to be as large as $10^{-14}$.Comment: 13 pages, LaTeX, UM-P-92/2

Bounds on minicharged neutrinos in the minimal standard model