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2020 Review of Particle Physics.
P.A. Zyla et al. (Particle Data Group), Prog. Theor. Exp. Phys. 2020, 083C01 (2020)

GAUGE AND HIGGS BOSONS

${{\boldsymbol \gamma}}$ (photon)

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${{\mathit \gamma}}$ MASS

$<1 \times 10^{-18}$ eV

${{\mathit \gamma}}$ CHARGE

$<1 \times 10^{-46}$ $\mathit e$