rₚ · proton rms charge radius

양성자 전하 반지름(제곱평균제곱근)

Takeaway

The relative standard uncertainty fell by a factor of about 10 from the 2002 to the 2022 edition (7.8×10⁻³ → 7.6×10⁻⁴): the error bars narrowed that much.
Of 5 earlier editions with a measured value, 4 have the 2022 value outside ±1σ (the error bar) and 4 outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22.
The largest move between editions came in 2014→2018, at 5.3 times the combined standard uncertainty of the two editions (|z| = 5.3).

Value ±1σ by edition2022

Relative deviation from the 2022 value (symmetric-log axis). Open circles: the error bar does not reach the 2022 value. Squares: exact.

Editionyear of the recommended values (data cut-off)	As printedexactly as in the source table; digits in parentheses are the standard uncertainty in the last digits	Standard uncertaintyhalf-width of the error bar (±1σ)	Relative standard uncertaintystandard uncertainty ÷ \|value\|: bar width relative to the value	z vs previous editionmove from the previous edition ÷ combined standard uncertainty of the two	z vs 2022(2022 value − this value) ÷ this edition's standard uncertainty	Source locationpage and table of the paper, or file and line of NIST's table
2002	0.8750(68) e-15	6.8×10⁻¹⁸	7.8×10⁻³		−5.0368	2002 ASCII:271
2006	0.8768(69) e-15	6.9×10⁻¹⁸	7.9×10⁻³	0.1858	−5.2246	2006 ASCII:273
2010	0.8775 e-15	5.1×10⁻¹⁸	5.8×10⁻³	0.0816	−7.2059	2010 ASCII:290
2014	0.8751 e-15	6.1×10⁻¹⁸	7.0×10⁻³	−0.3018	−5.6311	2014 ASCII:290
2018	8.414 e-16	1.9×10⁻¹⁸	2.3×10⁻³	−5.2746	−0.3421	2018 ASCII:296
2022	8.4075 e-16	6.4×10⁻¹⁹	7.6×10⁻⁴	−0.3242		2022 ASCII:297