sub-atomic physics. Symbol mα. 6.644 656 5(11) × 10-27 kg = 7 294.299 536 3(32) me with relative standard uncertainties 1.7 × 10-7 and 4.4 × 10-10.
[Mohr P. J., Taylor B. N. CODATA Recommended Values of the Fundamental Physical Constants: 2002 (to be published)]
[Mohr P. J., Taylor B. N. Rev. Mod. Phys. Vol. 72:351-495 (2000)]
[Mohr P. Phys. Today Vol. 53:7, 11-16 (2000)]
[For latest recommended values, see




