ELECTRIC CHARGE ($\mathit Q$)
${{\mathit \gamma}}$ charge (mixed)
$<1 \times 10^{-46}$
$\mathit e$
${{\mathit \gamma}}$ charge (single)
$<1 \times 10^{-35}$
$\mathit e$
${{\mathit e}}$ $\rightarrow$ ${{\mathit \nu}_{{{e}}}}{{\mathit \gamma}}$ and astrophysical limits
[1]
$>6.6 \times 10^{28}$
yr
CL=90.0%
${{\mathit \nu}}$ charge
$<4 \times 10^{-35}$
$\mathit e$
CL=95.0%
$\vert {{\mathit q}_{{{p}}}}+{{\mathit q}_{{{e}}}}\vert /{{\mathit e}}$
[2]
$<1 \times 10^{-21}$
${{\mathit n}}$ charge
($-2$ $\pm8$) $ \times 10^{-22}$
$\mathit e$
$\Gamma\mathrm {( {{\mathit n}} \rightarrow {{\mathit p}} {{\mathit \nu}_{{{e}}}} {{\overline{\mathit \nu}}_{{{e}}}})}$ $/$ $\Gamma\mathrm {(total)}$
$<8\times 10^{-27}$
CL=68.0%
[1]
This is the best limit for the mode ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \gamma}}$.
[2]
The limit is from neutrality-of-matter experiments; it assumes $\mathit q_{{{\mathit n}}}$ = $\mathit q_{{{\mathit p}}}$ $+$ $\mathit q_{{{\mathit e}}}$. See also the charge of the neutron.
