Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-04
Phys.Rev.D77:113006,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 5 figures. Added discussion on experimental errors. To appear in PRD
Scientific paper
10.1103/PhysRevD.77.113006
Among all neutrino mixing parameters, the atmospheric neutrino mixing angle theta_{23} introduces the strongest variation on the flux ratios of ultra high energy neutrinos. We investigate the potential of these flux ratio measurements at neutrino telescopes to constrain theta_{23}. We consider astrophysical neutrinos originating from pion, muon-damped and neutron sources and make a comparative study of their sensitivity reach to theta_{23}. It is found that neutron sources are most favorable for testing deviations from maximal theta_{23}. Using a chi^2 analysis, we show in particular the power of combining (i) different flux ratios from the same type of source, and also (ii) combining flux ratios from different astrophysical sources. We include in our analysis ``impure'' sources, i.e., deviations from the usually assumed initial (1 : 2 : 0), (0 : 1 : 0) or (1 : 0 : 0) flux compositions.
Choubey Sandhya
Niro Viviana
Rodejohann Werner
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