Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensitivity of the elastic electron-proton cross section to the proton
  radius   The precise determination of the proton radius from recent elastic scattering
electron-proton data is discussed. The necessary precision on the elastic cross
section to discriminate among the values coming from atomic spectroscopy is
scrutinized in terms of the relevant quantity, i.e., the derivative of the form
factor. It is shown that such precision is two orders of magnitude higher than
the precision on the cross section, that is the measured observable. Different
fits on the available data and of their discrete derivative, with analytical
constraints are shown. The systematic error associated to the radius is
evaluated taking into account the uncertainties from different sources, as the
extrapolation to the static point, the choice of the class of fitting functions
and the range of the data sample. This error is shown to be even orders of
magnitude larger than commonly assumed.

8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph