Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physics with Cosmic Neutrinos, PeV to ZeV   We begin with a brief overview of highest-energy cosmic ray data, and the
experiments which will perform neutrino astronomy. We then discuss two particle
physics aspects of neutrinos. They are possible long-lifetime decay of the
neutrino, and a measurement of the neutrino-nucleon cross-section at a CMS
energy orders of magnitude beyond what can be achieved with terrestrial
accelerators. Measurement of an anomalously large neutrino cross-section would
indicate new physics (e.g. low string-scale, extra dimensions, precocious
unification), while a smaller than expected cross-section would reveal an
aspect of QCD evolution. We then discuss aspects of neutrino-primary models for
the extreme-energy (EE) cosmic ray data. Primary neutrinos in extant data are
motivated by the directional clustering at EE reported by the AGASA experiment.
We discuss the impact of the strongly-interacting neutrino hypothesis on
lower-energy physics via dispersion relations, the statistical significance of
AGASA directional clustering, and the possible relevance of the Z-burst
mechanism for existing EE cosmic ray data.

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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin