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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.
30 wrz 2020 · Is the ‘proton-radius puzzle’ now resolved? In this Review, we scrutinize the experimental studies of the proton radius to gain insight on this issue.
6 lis 2019 · Progress on the proton-radius puzzle. Atomic physicists and nuclear physicists have each made a refined measurement of the radius of the proton. Both values agree with a hotly debated result...
1 maj 2015 · 1. Introduction. The proton radius conflict is a prime problem in proton structure physics. To state the problem is simple: we measure the proton radius using electrons, and we measure the proton radius using muons, and we get incompatibly different answers.
A ruler won't help and neither will a microscope. Instead, it involves smashing electrons into protons at nearly the speed of light, then measuring how far the electrons travel when they bounce...
19 cze 2021 · The strange discrepancy between CREMA and previous measurements became known as the “proton radius puzzle” because it involved what appeared to be two contrasting but very well founded sets of results.
12 kwi 2023 · A recent measurement of the 2S-8D transition by a group at Colorado State University leads to a proton radius of about 0.86 \,fm, in between the two aforementioned results. The current situation points to a possible, purely experimental, resolution of the proton radius puzzle.
