Analytical theory of neutrino oscillations in matter with CP violation

Mikkel B. Johnson, Ernest M. Henley, and Leonard S. Kisslinger
Phys. Rev. D 91, 076005 – Published 16 April 2015

Abstract

We develop an exact analytical formulation of neutrino oscillations in matter within the framework of the standard neutrino model assuming three Dirac neutrinos. Our Hamiltonian formulation, which includes CP violation, leads to expressions for the partial oscillation probabilities that are linear combinations of spherical Bessel functions in the eigenvalue differences. The coefficients of these Bessel functions are polynomials in the neutrino CKM matrix elements, the neutrino mass differences squared, the strength of the neutrino interaction with matter, and the neutrino mass eigenvalues in matter. We give exact closed-form expressions for all partial oscillation probabilities in terms of these basic quantities. Adopting the standard neutrino model, we then examine how the exact expressions for the partial oscillation probabilities might simplify by expanding in one of the small parameters α and sinθ13 of this model. We show explicitly that for small α and sinθ13, there are branch points in the analytic structure of the eigenvalues that lead to singular behavior of expansions near the solar and atmospheric resonances. We present numerical calculations that indicate how to use the small-parameter expansions in practice.

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  • Received 2 February 2015

DOI:https://doi.org/10.1103/PhysRevD.91.076005

© 2015 American Physical Society

Authors & Affiliations

Mikkel B. Johnson

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Ernest M. Henley

  • Department of Physics, University of Washington, Seattle, Washington 98195, USA

Leonard S. Kisslinger

  • Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213, USA

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Vol. 91, Iss. 7 — 1 April 2015

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