arXiv:1010.4096·v2·High Energy Astrophysical Phenomena
Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube
IceCube Collaboration: R. Abbasi · Y. Abdou · T. Abu-Zayyad · J. Adams · J. A. Aguilar · M. Ahlers · K. Andeen · J. Auffenberg · X. Bai · M. Baker · S. W. Barwick · R. Bay
Abstract
A search for sidereal modulation in the flux of atmospheric muon neutrinos in IceCube was performed. Such a signal could be an indication of Lorentz-violating physics. Neutrino oscillation models, derivable from extensions to the Standard Model, allow for neutrino oscillations that depend on the neutrino's direction of propagation. No such direction-dependent variation was found. A discrete Fourier transform method was used to constrain the Lorentz and CPT-violating coefficients in one of these models. Due to the unique high energy reach of IceCube, it was possible to improve constraints on certain Lorentz-violating oscillations by three orders of magnitude with respect to limits set by other experiments.
Comments: 5 pages, 2 figures. Revision updates a reference and adds a comment on the 120 degree zenith restriction