Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-11
Phys.Rev.D66:103002,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 5 figures, added new figure comparing cosmic ray and LHC black hole rates, to be published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.66.103002
Ultra-high energy cosmic neutrinos are incisive probes of both astrophysical sources and new TeV-scale physics. Such neutrinos would create extensive air showers deep in the atmosphere. The absence of such showers implies upper limits on incoming neutrino fluxes and cross sections. Combining the exposures of AGASA, the largest existing ground array, with the exposure of the Fly's Eye fluorescence detector integrated over all its operating epochs, we derive 95% CL bounds that substantially improve existing limits. We begin with model-independent bounds on astrophysical fluxes, assuming standard model cross sections, and model-independent bounds on new physics cross sections, assuming a conservative cosmogenic flux. We then derive model-dependent constraints on new components of neutrino flux for several assumed power spectra, and we update bounds on the fundamental Planck scale M_D in extra dimension scenarios from black hole production. For large numbers of extra dimensions, we find M_D > 2.0 (1.1) TeV for \mbhmin = M_D (5 M_D), comparable to or exceeding the most stringent constraints to date.
Anchordoqui Luis A.
Feng Jonathan L.
Goldberg Haim
Shapere Alfred D.
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