The use of Cosmic Rays (CR) as a benchmark for new physics (beyond the Standard Model of particle physics) search, is an approach based on the fact that historically, the energy reached by the particle colliders has been and continues to be smaller than the energy the CR can achieve.

Nevertheless the energies achieved by the particle colliders are getting closer to those of the CR of the highest energies, as a consequence the possible effects of new physics is now seeking mainly in CR of ultra high energy (UHECR), with an extremely low flux, resulting in a poor statistic but remains an opportunity to research for new physics.

In this work we present a general, model independent, analysis of the behavior of Ultra–High Energy Extensive Air Showers (UHE EAS) when some new effect, represented through the parametrization of a set of observables, are present and we determine on which range of this parameters could be possible to discern these kind of physics.