The reactor mixing angle and CP violation with two texture zeros in the light of T2K

Abstract

We reconsider the phenomenological implications of two texture zeros in symmetric neutrino mass matrices in the light of the recent T2K result for the reactor angle and the new global analysis which gives also best fit values for the Dirac CP phase delta. The most important results of the analysis are: Among the viable cases classified by Frampton et al. only A1 and A2 predict the reactor mixing angle to be different from zero at 3 sigma. Furthermore these two cases are compatible only with a normal mass spectrum in the allowed region for the reactor angle. At the best fit value A1 and A2 predict 0.024 >= sin^2(theta13) >= 0.012 and 0.014 <= sin^2(theta13) <= 0.032, respectively, where the bounds on the right and the left correspond to cos(delta)=-1 and cos(delta)=1, respectively. The cases B1, B2, B3 and B4 predict nearly maximal CP violation, i.e. cos(delta) is approximately zero.

16 pages, 13 figures, references added, version matches publication in Nucl. Phys. B

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• Texture zeros flavor neutrino mass matrix and triplet Higgs models
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• Charged lepton-flavor violating processes and suppression of nonunitary mixing effects in low-scale seesaw models
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• Phenomenology of Trimaximal mixing with one texture equality
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