Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton Shell Structure   We study the internal structure of the proton and propose a shell structure
model of the proton. Based on the mass distribution and mass radius of proton
we analyze the experiments at different energy scales and conclude that there
should be shell structure inside proton, and the quark and gluon shells are
energy-scale-dependent. We successfully explain the dip-like structure in the
proton-proton elastic scattering cross section distribution from TOTEM
Collaboration using the mass decomposition of proton and the proton shell
structure at different energy scales.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: eess