Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evaluation of the proton charge radius from e-p scattering   In light of the proton radius puzzle, the discrepancy between measurements of
the proton charge radius from muonic hydrogen and those from electronic
hydrogen and electron-proton scattering measurements, we reexamine the charge
radius extractions from electron scattering measurements. We provide a
recommended value for the proton RMS charge radius, $r_E = 0.879 \pm 0.011$ fm,
based on a global examination of elastic e-p scattering data. The uncertainties
include contributions to account for tension between different data sets and
inconsistencies between radii using different extraction procedures.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph