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In neutrino oscillations, a neutrino created with one flavor can be laterdetected with a different flavor, with some probability. In general, theprobability is computed exactly by diagonalizing the Hamiltonian operator thatdescribes the physical system and that drives the oscillations. Here we use analternative method developed by Ohlsson & Snellman to compute exact oscillationprobabilities, that bypasses diagonalization, and that produces expressions forthe probabilities that are straightforward to implement. The method employsexpansions of quantum operators in terms of SU(2) and SU(3) matrices. Weimplement the method in the code NuOscProbExact, which we make publiclyavailable. It can be applied to any closed system of two or three neutrinoflavors described by an arbitrary time-independent Hamiltonian. This includes,but is not limited to, oscillations in vacuum, in matter of constant density,with non-standard matter interactions, and in a Lorentz-violating background.

NuOscProbExact: a general-purpose code to compute exact two-flavor and three-flavor neutrino oscillation probabilities