Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-31
Astropart. Phys. 25 (2006) 14-32
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages (RevTeX); revised to show rates for both the cosmogenic and Waxman-Bahcall neutrino flux; to appear in Astroparticle
Scientific paper
10.1016/j.astropartphys.2005.10.
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.
Anchordoqui Luis
Han Tao
Hooper Dan
Sarkar Subir
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