Testing Lorentz invariance and CPT conservation with NuMI neutrinos in the MINOS near detector

Phys Rev Lett. 2008 Oct 10;101(15):151601. doi: 10.1103/PhysRevLett.101.151601. Epub 2008 Oct 9.

Abstract

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).