Testing Lorentz Invariance and CPT Conservation with NuMI Neutrinos in the MINOS Near Detector
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A search for a sidereal modulation in the MINOS near detector neutrino data was performed. If present, this signature could be a consequence of Lorentz and CPT violation as predicted by the effective field theory called the standard-model extension. No evidence for a sidereal signal in the data set was found, implying that there is no significant change in neutrino propagation that depends on the direction of the neutrino beam in a sun-centered inertial frame. Upper limits on the magnitudes of the Lorentz and CPT violating terms in the standard-model extension lie between 10(-4) and 10(-2) of the maximum expected, assuming a suppression of these signatures by a factor of 10(-17).
author list (cited authors)
Adamson, P., Andreopoulos, C., Arms, K. E., Armstrong, R., Auty, D. J., Ayres, D. S., ... Zwaska, R.