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      Upgoing ANITA events as evidence of the CPT symmetric universe

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          Abstract

          We explain the two upgoing ultra-high energy shower events observed by ANITA as arising from the decay in the Earth's core of the quasi-stable dark matter candidate in the CPT symmetric universe. The dark matter particle is a 480 PeV right-handed neutrino that decays into a Higgs and a light Majorana neutrino. The latter interacts in the Earth's crust to produce a tau lepton that in turn initiate an atmospheric upgoing shower.

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          Resonant enhancements in weakly interacting massive particle capture by the earth

          Andrew Gould (1987)
          Article 0 comments Cited 227 times – based on 0 reviews     Review now
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            Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data

            M. G. Aartsen, M Ackermann, J. Adams … (2014)
            A search for high-energy neutrinos interacting within the IceCube detector between 2010 and 2012 provided the first evidence for a high-energy neutrino flux of extraterrestrial origin. Results from an analysis using the same methods with a third year (2012-2013) of data from the complete IceCube detector are consistent with the previously reported astrophysical flux in the 100 TeV - PeV range at the level of \(10^{-8}\, \mathrm{GeV}\, \mathrm{cm}^{-2}\, \mathrm{s}^{-1}\, \mathrm{sr}^{-1}\) per flavor and reject a purely atmospheric explanation for the combined 3-year data at \(5.7 \sigma\). The data are consistent with expectations for equal fluxes of all three neutrino flavors and with isotropic arrival directions, suggesting either numerous or spatially extended sources. The three-year dataset, with a livetime of 988 days, contains a total of 37 neutrino candidate events with deposited energies ranging from 30 to 2000 TeV. The 2000 TeV event is the highest-energy neutrino interaction ever observed.
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              Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data

              IceCube Collaboration, M. G. Aartsen, K. Abraham … (2016)
              The IceCube Collaboration has previously discovered a high-energy astrophysical neutrino flux using neutrino events with interaction vertices contained within the instrumented volume of the IceCube detector. We present a complementary measurement using charged current muon neutrino events where the interaction vertex can be outside this volume. As a consequence of the large muon range the effective area is significantly larger but the field of view is restricted to the Northern Hemisphere. IceCube data from 2009 through 2015 have been analyzed using a likelihood approach based on the reconstructed muon energy and zenith angle. At the highest neutrino energies between 191 TeV and 8.3 PeV a significant astrophysical contribution is observed, excluding a purely atmospheric origin of these events at \(5.6\,\sigma\) significance. The data are well described by an isotropic, unbroken power law flux with a normalization at 100 TeV neutrino energy of \(\left(0.90^{+0.30}_{-0.27}\right)\times10^{-18}\,\mathrm{GeV^{-1}\,cm^{-2}\,s^{-1}\,sr^{-1}}\) and a hard spectral index of \(\gamma=2.13\pm0.13\). The observed spectrum is harder in comparison to previous IceCube analyses with lower energy thresholds which may indicate a break in the astrophysical neutrino spectrum of unknown origin. The highest energy event observed has a reconstructed muon energy of \((4.5\pm1.2)\,\mathrm{PeV}\) which implies a probability of less than 0.005% for this event to be of atmospheric origin. Analyzing the arrival directions of all events with reconstructed muon energies above 200 TeV no correlation with known \(\gamma\)-ray sources was found. Using the high statistics of atmospheric neutrinos we report the currently best constraints on a prompt atmospheric muon neutrino flux originating from charmed meson decays which is below \(1.06\) in units of the flux normalization of the model in Enberg et al. (2008).
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                Author and article information

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                Publication date Created: 30 March 2018
                Article
                ArXiV ID: 1803.11554
                SO-VID: dfdea627-810f-4186-b736-2edd0a74eac8
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Comments 3 pages revtex
                Categories hep-ph astro-ph.HE

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