Getting at large theta_13 with almost maximal theta_23 from tri-bimaximal mixing

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  • 26 June 2011
Abstract
We introduce a small correction term dM_nu in the neutrino sector and examine whether a large theta_13 and an almost maximal theta_23 can simultaneously be obtained starting from the tri-bimaximal neutrino mixing. It is found that one can easily induce theta_13 simeq 10^circ, which is favored by the recent T2K experiment, by taking account of the enhancement due to the degeneracy among three neutrino masses. We also find that (dM_nu)_22 = (dM_nu)_33 is a key condition for theta_23 simeq 45^circ.

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