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${{\mathit p}}$ MASS (atomic mass units u)
$1.007276466621 \pm0.000000000053$ u
${{\mathit p}}$ MASS (MeV)
$938.27208816 \pm0.00000029$ MeV
$\vert {\mathit m}_{{{\mathit p}}}−{\mathit m}_{{{\overline{\mathit p}}}}\vert /{\mathit m}_{{{\mathit p}}}$
$<7 \times 10^{-10}$ CL=90.0%
${{\overline{\mathit p}}}/{{\mathit p}}$ CHARGE-TO-MASS RATIO, $\vert {\mathit q_{{{\overline{\mathit p}}}}\over {\mathit m}_{{{\overline{\mathit p}}}}}\vert /({\mathit q_{{{\mathit p}}}\over {\mathit m}_{{{\mathit p}}}}$)
$1.000000000003 \pm0.000000000016$
($\vert {\mathit q_{{{\overline{\mathit p}}}}\over {\mathit m}_{{{\overline{\mathit p}}}}}\vert -{\mathit q_{p}\over {\mathit m}_{{{\mathit p}}}})/{\mathit q_{{{\mathit p}}}\over {\mathit m}_{{{\mathit p}}}}$
$(0.3 \pm1.6) \times 10^{-11}$
$\vert \mathit q_{{{\mathit p}}}~+~\mathit q_{{{\overline{\mathit p}}}}\vert /{{\mathit e}}$
$<7 \times 10^{-10}$ CL=90.0%
$\vert {{\mathit q}_{{{p}}}}+{{\mathit q}_{{{e}}}}\vert /{{\mathit e}}$
$<1 \times 10^{-21}$
${{\mathit p}}$ MAGNETIC MOMENT
$2.7928473446 \pm0.0000000008$ $\mu _{\mathit N}$
${{\overline{\mathit p}}}$ MAGNETIC MOMENT
$-2.792847344 \pm0.000000004$ $\mu _{\mathit N}$
(${\mathit \mu}_{{{\mathit p}}}$ $+$ ${\mathit \mu}_{{{\overline{\mathit p}}}}$) $/$ $\mu _{{{\mathit p}}}$
$(2 \pm4) \times 10^{-9}$
${{\mathit p}}$ ELECTRIC DIPOLE MOMENT
$<2.1 \times 10^{-25}$ $\mathit e~$cm
${{\mathit p}}$ ELECTRIC POLARIZABILITY ${{\mathit \alpha}_{{{p}}}}$
$0.00115 \pm0.00004$ fm${}^{3}$ (S = 1.1)
${{\mathit p}}$ CHARGE RADIUS
$0.8409 \pm0.0004$ fm
${{\mathit p}}$ MAGNETIC RADIUS
$0.851 \pm0.026$ fm
${{\mathit p}}$ MEAN LIFE
$>9 \times 10^{29}$ years CL=90.0%
${{\overline{\mathit p}}}$ MEAN LIFE
See the ``Note on Nucleon Decay'' in our 1994 edition (Phys. Rev. $\mathbf {D50}$, 1173) for a short review.
