LEPTONS
INSPIRE search

${{\mathit e}}$ $J$ = $1/2$

${{\mathit e}}$ MASS (atomic mass units u)   $(5.48579909070 \pm0.00000000016) \times 10^{-4}$ u 
${{\mathit e}}$ MASS   $0.5109989461 \pm0.0000000031$ MeV 
$({\mathit m}_{{{\mathit e}^{+}}}–{\mathit m}_{{{\mathit e}^{-}}})/{\mathit m}_{\mathrm {average}}$   $<8 \times 10^{-9}$   CL=90.0%
$\vert \mathit q_{{{\mathit e}^{+}}}~+~\mathit q_{{{\mathit e}^{-}}}\vert /{{\mathit e}}$   $<4 \times 10^{-8}$  
${{\mathit e}}$ MAGNETIC MOMENT ANOMALY
${{\mathit \mu}_{{e}}}/{{\mathit \mu}_{{B}}}$ $−$ 1 = ($\mathit g−$2)/2   $0.00115965218091 \pm0.00000000000026$  
(${\mathit g}_{{{\mathit e}^{+}}}–{\mathit g}_{{{\mathit e}^{-}}}$) $/$ $\mathit g_{{\mathrm {average}}}$   $(-0.5 \pm2.1) \times 10^{-12}$  
${{\mathit e}}$ ELECTRIC DIPOLE MOMENT (d)   $<0.87 \times 10^{-28}$ $\mathit e~$cm  CL=90.0%
${{\mathit e}^{-}}$ MEAN LIFE $/$ BRANCHING FRACTION
${{\mathit e}}$ $\rightarrow$ ${{\mathit \nu}_{{e}}}{{\mathit \gamma}}$ and astrophysical limits   $>6.6 \times 10^{28}$ yr  CL=90.0%
Disappearance and nuclear-de-excitation experiments   $>6.4 \times 10^{24}$ yr  CL=68.0%
LIMITS ON LEPTON-FLAVOR VIOLATION IN PRODUCTION
${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \tau}^{\mp}}{)}$ $/$ ${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{)}$   $<8.9 \times 10^{-6}$   CL=95.0%
${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{\pm}}{{\mathit \tau}^{\mp}}{)}$ $/$ ${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{)}$   $<4.0 \times 10^{-6}$   CL=95.0%