Breaking of isotropy and Lorentz boost invariance in the dynamics of second-generation leptons would lead to direction-dependent changes in the lifetimes of charged pions. This would make the intensity of a neutrino beam produced via pion decay a function of the beam orientation. The experimental signature of this phenomenon—sidereal variations in the event rate at a downstream neutrino detector—has already been studied, in searches for Lorentz-violating neutrino oscillations. Existing analyses of MINOS near detector data can be used to constrain the flavor-diagonal Lorentz violation coefficients affecting muon neutrino speeds at roughly the 10−5 level.
Digital Object Identifier (DOI)
Physical Review D, Volume 87, Issue 9, 2013.
© 2013 American Physical Society
Altschul, B. (2013). Neutrino beam constraints on flavor-diagonal Lorentz violation. Physical Review D, 87(9). https://doi.org/10.1103/physrevd.87.096004