Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searches for Contact Interactions at HERA   The H1 and ZEUS collaborations at HERA have searched for signatures of
physics beyond the Standard Model with high Q^2 neutral current deep inelastic
electron-proton and positron-proton scattering events. No significant
deviations from Standard Model predictions were observed. Various eeqq contact
nteraction models have been considered. Limits on the compositeness scale in
general eeqq contact interaction models, mass to the Yukawa coupling ratio for
heavy leptoquarks, the effective Planck mass scale in models with large extra
dimensions and the effective quark charge radius are presented.

19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph