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${{\mathit \pi}^{0}}$ MASS
$134.9770 \pm0.0005$ MeV (S = 1.1)
${\mathit m}_{{{\mathit \pi}^{\pm}}}{\mathit m}_{{{\mathit \pi}^{0}}}$
$4.5936 \pm0.0005$ MeV
${{\mathit \pi}^{0}}$ MEAN LIFE
$(8.52 \pm0.18) \times 10^{-17}$ s (S = 1.2)
LINEAR COEFFICIENT OF ${{\mathit \pi}^{0}}$ ELECTROMAGNETIC FORM FACTOR
$0.0335 \pm0.0031$
For decay limits to particles which are not established, see the appropriate Search sections (${{\mathit A}^{0}}$ (axion) and Other Light Boson (${{\mathit X}^{0}}$) Searches, etc.).
Mode
Fraction ($\Gamma_i$ / $\Gamma$)
Scale Factor/ Conf. Level
P (MeV/c)
$\Gamma_{1}$ 2 ${{\mathit \gamma}}$ $(98.823\pm{0.034})\%$ S=1.5 67
$\Gamma_{2}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ $(1.174\pm{0.035})\%$ S=1.5 67
$\Gamma_{3}$ ${{\mathit \gamma}}$ positronium $(1.82\pm{0.29})\times 10^{-9}$ 67
$\Gamma_{4}$ ${{\mathit e}^{+}}{{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit e}^{-}}$ $(3.34\pm{0.16})\times 10^{-5}$ S=1.0 67
$\Gamma_{5}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $(6.46\pm{0.33})\times 10^{-8}$ 67
$\Gamma_{6}$ 4 ${{\mathit \gamma}}$ $<2\times 10^{-8}$ CL=90% 67
$\Gamma_{7}$ ${{\mathit \nu}}{{\overline{\mathit \nu}}}$ [1] $<2.7\times 10^{-7}$ CL=90% 67
$\Gamma_{8}$ ${{\mathit \nu}_{{e}}}{{\overline{\mathit \nu}}_{{e}}}$ $<1.7\times 10^{-6}$ CL=90% 67
$\Gamma_{9}$ ${{\mathit \nu}_{{\mu}}}{{\overline{\mathit \nu}}_{{\mu}}}$ $<1.6\times 10^{-6}$ CL=90% 67
$\Gamma_{10}$ ${{\mathit \nu}_{{\tau}}}{{\overline{\mathit \nu}}_{{\tau}}}$ $<2.1\times 10^{-6}$ CL=90% 67
$\Gamma_{11}$ ${{\mathit \gamma}}{{\mathit \nu}}{{\overline{\mathit \nu}}}$ $<6\times 10^{-4}$ CL=90% 67
▸ Charge conjugation ($\mathit C$) or Lepton Family number ($\mathit LF$) violating modes