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The radius of the proton is defined by a formula which can be calculated by quantum electrodynamics and be derived from either atomic spectroscopy or by electron–proton scattering. The formula involves a form-factor related to the two-dimensional parton diameter of the proton.
11 sty 2018 · The slope of the FF at Q2 = 0 continues to be called the radius for reasons of history / simplicity / NRQM, but it is not the radius. Nucleon magnetic FFs crudely follow the dipole formula, G D = (1+Q2/0.71 GeV 2)-2, which a) has the expected high Q2 pQCD behavior, and b) is amusingly the 3d FT of an exponential, but c) has no theoretical ...
11 lis 2019 · That means muon measurements of the proton’s radius should be millions of times more precise than those made using ordinary hydrogen. The team measured a proton radius of 0.84184 femtometres.
7 lis 2019 · Precise measurements of the differences between various electrons’ energy levels — a technique known as spectroscopy — therefore provide a way to estimate the proton’s radius.
1 lut 2014 · Two experiments have come up with two wildly different values for the proton's radius. What's going on?
The radius of the proton is defined by a formula that can be calculated by quantum electrodynamics and be derived from either atomic spectroscopy or by electron–proton scattering. The formula involves a form-factor related to the two-dimensional parton diameter of the proton.
30 wrz 2020 · The charge radius of the proton can be determined using two different experimental techniques: measurements of electron–proton elastic scattering cross sections and high-resolution...
