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Abstract:
Current experimental data on neutrino mixing are
very well described by TriBiMaximal mixing. Accordingly,
any phenomenological parametrization of the MNSP matrix
must build upon TriBiMaximal mixing. We propose one
particularly natural parametrization, which we call
"TriMinimal". The three small deviations of the PDG
angles from their TriBiMaximal values, and the PDG phase,
parametrize the TriMinimal mixing matrix. As an important
example of the utility of this new parametrization, we
present the simple resulting expressions for the
flavor-mixing probabilities of atmospheric and astrophysical
neutrinos. As no foreseeable experiment will be sensitive
to more than second order in the small parameters, we
expand these flavor probabilities to second order.
