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Full-Text Articles in Physics
Lorentz And Cpt Violation In Scalar-Mediated Potentials, Brett David Altschul
Lorentz And Cpt Violation In Scalar-Mediated Potentials, Brett David Altschul
Faculty Publications
In Lorentz- and CPT-violating effective field theories involving scalar and spinor fields, there exist forms of Lorentz violation that modify only the scalar-spinor Yukawa interaction vertices. These affect low-energy fermion and antifermion scattering processes through modifications to the nonrelativistic Yukawa potentials. The modified potentials involve novel combinations of momentum, spin, and Lorentz-violating background tensors.
Neutrino Beam Constraints On Flavor-Diagonal Lorentz Violation, Brett David Altschul
Neutrino Beam Constraints On Flavor-Diagonal Lorentz Violation, Brett David Altschul
Faculty Publications
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.