Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Limits on the effective quark radius from inclusive ep scattering &
  contact interactions at HERA   The high-precision HERA data allow searches for up to TeV scales "Beyond the
Standard Model" contributions to electron-quark scattering. Combined H1 and
ZEUS measurements of inclusive deep inelastic cross sections in neutral and
charged current ep scattering are considered, corresponding to a luminosity of
around 1 fb$^{-1}$. A new approach to the beyond the Standard Model analysis of
the inclusive $ep$ data is presented; simultaneous fits of parton distribution
functions and contributions of "new physics" processes are performed.
Considered are possible deviations from the Standard Model due to a finite
radius of quarks, described within the quark form-factor model, and due to new
electron-quark interactions in the framework of $eeqq$ contact interactions
(CI). The resulting 95% C.L. upper limit on the effective quark radius is
$0.43\cdot 10^{-16}$ cm. The limits on the CI mass scale extend up to 10 TeV
depending on the CI scenario.

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The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math