Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exotic Neutrino Interactions at the Pierre Auger Observatory   The Pierre Auger Observatory for cosmic rays provides a laboratory for
studying fundamental interactions at energies well beyond those available at
colliders. In addition to hadrons or photons, Auger is sensitive to ultra-high
energy neutrinos in the cosmic radiation and models for new physics can be
explored by observing neutrino interactions at center-of-mass energies beyond
the TeV scale. By comparing the rate for quasi-horizontal, deeply penetrating
air showers triggered by all types of neutrinos with the rate for slightly
upgoing showers generated by Earth-skimming tau neutrinos, any deviation of the
neutrino-nucleon cross-section from the Standard Model expectation can be
constrained. We show that this can test models of low-scale quantum gravity
(including processes such as Kaluza-Klein graviton exchange, microscopic black
hole production and string resonances), as well as non-perturbative electroweak
instanton mediated processes. Moreover, the observed ratios of neutrino flavors
would severely constrain the possibility of neutrino decay.

15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
19
The categories of this paper are: eess