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We apply the permutation symmetry S_3 to both charged-lepton and neutrinomass matrices, and suggest a useful symmetry-breaking scheme, in which theflavor symmetry is explicitly broken down via S_3 -> Z_3 -> nothing in thecharged-lepton sector and via S_3 -> Z_2 -> nothing in the neutrino sector.Such a two-stage breaking scenario is reasonable in the sense that both Z_3 andZ_2 are the subgroups of S_3, while Z_3 and Z_2 only have a trivial subgroup.In this scenario, we can obtain a relatively large value of the smallestneutrino mixing angle, e.g., theta_{13} ~ 9^\circ, which is compatible with therecent result from T2K experiment and will be precisely measured in the ongoingDouble Chooz and Daya Bay reactor neutrino experiments. Moreover, the maximalatmospheric mixing angle theta_{23} ~ 45^\circ can also be obtained while thebest-fit value of solar mixing angle theta_{12} ~ 34^\circ is assumed, whichcannot be achieved in previous S_3 symmetry models.

Relatively large theta13 and nearly maximal theta23 from the approximate S3 symmetry of lepton mass matrices