arXiv:2104.02031nucl-ex
Determination of shear forces inside the proton
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Abstract
We report on the first determination of the shear forces quarks inside the proton from experimental data on deeply virtual Compton scattering. The maximum shear force of approximately 40 MeV/fm occurs near 0.6 fm from the proton center, indicating where confinement forces may be strongest. On the macroscopic scale of the earth surface, this force corresponds to the weight of a mass of about 650 kg. The shear forces in the proton reverse direction at r = 0.45 fm from the center.
This was the last one https://news.ycombinator.com/item?id=39163447 and a paper from last year https://arxiv.org/abs/2310.11568 and basically the same paper from three years ago (you'll recognize one of the plots from the last article) https://arxiv.org/abs/2104.02031
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