Tests of Lorentz invariance at the Sudbury Neutrino Observatory
2018
Experimental tests of Lorentz symmetry in systems of all types are critical for ensuring that the basic assumptions of physics are well founded. Data from all phases of the
Sudbury Neutrino Observatory, a kiloton-scale
heavy water
Cherenkov detector, are analyzed for possible violations of Lorentz symmetry in the
neutrinosector. Such violations would appear as one of eight possible signal types in the detector: six seasonal variations in the solar
electron neutrinosurvival probability differing in energy and time dependence and two shape changes to the oscillated
solar neutrinoenergy spectrum. No evidence for such signals is observed, and limits on the size of such effects are established in the framework of the
standard model extension, including 38 limits on previously unconstrained operators and improved limits on 16 additional operators. This makes limits on all minimal, Dirac-type Lorentz violating operators in the
neutrinosector available for the first time.
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