Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The sensitivity of cosmic ray air shower experiments for leptoquark
  detection   Leptoquarks arise naturally in models attempting the unification of the quark
and lepton sectors of the standard model of particle physics. Such particles
could be produced in the interaction of high energy quasi-horizontal cosmic
neutrinos with the atmosphere, via their direct coupling to a quark and a
neutrino. The hadronic decay products of the leptoquark, and possibly its
leptonic decay products would originate an extensive air shower, observable in
large cosmic ray experiments. In this letter, the sensitivity of present and
planned very high energy cosmic ray experiments to the production of
leptoquarks of different types is estimated and discussed.

36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg