Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How well do we know the electromagnetic form factors of the proton?   Several experiments have extracted proton electromagnetic form factors from
elastic cross section measurements using the Rosenbluth technique. Global
analyses of these measurements indicate approximate scaling of the electric and
magnetic form factors (mu_p*G_E/G_M = 1), in contrast to recent polarization
transfer measurements from Jefferson Lab. We present here a global reanalysis
of the cross section data aimed at understanding the disagreement between the
Rosenbluth extraction and the polarization transfer data. We find that the
individual cross section measurements are self-consistent, and that the new
global analysis yields results that are still inconsistent with polarization
measurements. This discrepancy indicates a fundamental problem in one of the
two techniques, or a significant error in polarization transfer or cross
section measurements. An error in the polarization data would imply a large
error in the extracted electric form factor, while an error in the cross
sections implies an uncertainty in the extracted form factors, even if the form
factor ratiois measured exactly.

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The categories of this paper are: comp-gas
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin