Constraints on Cosmic Neutrino Fluxes from the ANITA Experiment

Department of Physics, The Ohio State University, Columbus, Ohio, United States
Physical Review Letters (Impact Factor: 7.51). 01/2006; 96(17). DOI: 10.1103/PhysRevLett.96.171101
Source: arXiv

ABSTRACT We report new limits on cosmic neutrino fluxes from the test flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment, which completed an 18.4 day flight of a prototype long-duration balloon payload, called ANITA-lite, in early 2004. We search for impulsive events that could be associated with ultra-high energy neutrino interactions in the ice, and derive limits that constrain several models for ultra-high energy neutrino fluxes. We rule out the long-standing Z-burst model as the source for the ultra-high energy cosmic rays.

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Available from: W. R. Binns, Oct 18, 2012
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    • "Evidence supporting an extragalactic origin of these CR is the observation of energy flux suppression consistent with the GZK-effect[5] [6] by the High Resolution Fly's Eye Experiment[3] and the Pierre Auger Observatory (Auger)[4]. The primary evidence supporting the astrophysical origin of these CR (as opposed to, say, heavy relic decay) is the lack of an observable flux of photons by Auger[7] [8] [9] and the lack of neutrinos observed by ANITA[10] [11]. "
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    ABSTRACT: The two-point angular correlation function is a traditional method used to search for deviations from expectations of isotropy. In this paper we develop and explore a statistically descriptive three-point method with the intended application being the search for deviations from isotropy in the highest energy cosmic rays. We compare the sensitivity of a two-point method and a "shape-strength" method for a variety of Monte-Carlo simulated anisotropic signals. Studies are done with anisotropic source signals diluted by an isotropic background. Type I and II errors for rejecting the hypothesis of isotropic cosmic ray arrival directions are evaluated for four different event sample sizes: 27, 40, 60 and 80 events, consistent with near term data expectations from the Pierre Auger Observatory. In all cases the ability to reject the isotropic hypothesis improves with event size and with the fraction of anisotropic signal. While ~40 event data sets should be sufficient for reliable identification of anisotropy in cases of rather extreme (highly anisotropic) data, much larger data sets are suggested for reliable identification of more subtle anisotropies. The shape-strength method consistently performs better than the two point method and can be easily adapted to an arbitrary experimental exposure on the celestial sphere. Comment: Fixed PDF error
    Journal of Physics G Nuclear and Particle Physics 05/2009; 36(11). DOI:10.1088/0954-3899/36/11/115203 · 2.78 Impact Factor
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    • "The upper limits from AMANDA [40], see also Ref. [41], ANITA-lite [42], FORTE [43], GLUE [44], and RICE [45] are plotted. Also shown are projected sensitivities of ANITA [42], EUSO [46], IceCube [47], LOFAR [48], OWL [49], the Pierre Auger Observatory in ν e , ν µ modes and in ν τ mode (bottom swath) [50], SalSA [51], and WSRT [48], corresponding to one event per energy decade and indicated duration. Also shown are predictions from astrophysical Cosmic Ray (CR) sources [52], from inelastic interactions of CR's with the cosmic microwave background (CMB) photons (cosmogenic neutrinos) [52] [53], and from topological defects [54]. "
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    ABSTRACT: Recently, a new non-Standard Model neutrino interaction mediated by a light scalar field was proposed, which renders the big-bang relic neutrinos of the cosmic neutrino background a natural dark energy candidate, the so-called Neutrino Dark Energy. As a further consequence of this interaction, the neutrino masses become functions of the neutrino energy densities and are thus promoted to dynamical, time/redshift dependent quantities. Such a possible neutrino mass variation introduces a redshift dependence into the resonance energies associated with the annihilation of extremely high-energy cosmic neutrinos on relic anti-neutrinos and vice versa into Z-bosons. In general, this annihilation process is expected to lead to sizeable absorption dips in the spectra to be observed on earth by neutrino observatories operating in the relevant energy region above 10^13 GeV. In our analysis, we contrast the characteristic absorption features produced by constant and varying neutrino masses, including all thermal background effects caused by the relic neutrino motion. We firstly consider neutrinos from astrophysical sources and secondly neutrinos originating from the decomposition of topological defects using the appropriate fragmentation functions. On the one hand, independent of the nature of neutrino masses, our results illustrate the discovery potential for the cosmic neutrino background by means of relic neutrino absorption spectroscopy. On the other hand, they allow to estimate the prospects for testing its possible interpretation as source of Neutrino Dark Energy within the next decade by the neutrino observatories ANITA and LOFAR. Comment: 38 pages, 19 figures
    Journal of Cosmology and Astroparticle Physics 06/2006; 2006(10). DOI:10.1088/1475-7516/2006/10/012 · 5.81 Impact Factor
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