Searching for Quantum Gravity with High-energy Atmospheric Neutrinos and AMANDA-II.

Searching for Quantum Gravity with High-energy Atmospheric Neutrinos and AMANDA-II.

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The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance (VLI) or quantum decoherence (QD). Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on VLI and QD parameters using a maximum likelihood method. Given the absence of new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.... function (PDF) PM(#), a polynomial fit to the zenith-angle dependence of the muon flux at the depth of the AMANDA-II detector. ... (6.2) i The log-likelihood ratio of the UL fit to the BL fit is then a test statistic which we can use as a quality parameter. 6.3 Quality Cuts After initial filtering and reconstruction (after level 3), atmospheric neutrino events are still dominated by ... Including a dependence on the zenith angle is necessary because this test gets less powerful near the horizon, anbsp;...


Title:Searching for Quantum Gravity with High-energy Atmospheric Neutrinos and AMANDA-II.
Author: John Lawrence Kelley
Publisher:ProQuest - 2008
ISBN-13:

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