  We give a simple, semianalytic theory of the development of the hadronic and
neutrino/muon components of a cascade induced by a primary which produces
hadrons at the initial interaction. The main purpose of the theory is to allow
the user to obtain quick, but reasonably reliable estimates of the longitudinal
properties of such cascades developing in a medium, such as a stellar interior,
the atmosphere and/or water. As an application, we discuss the possibility of
discovering physics beyond the Standard Model by means of neutrino telescopes.
Some of those events may have spectacular signatures in neutrino telescopes.
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