Sizeable \theta_13 from the Charged Lepton Sector in SU(5),   (Tri-)Bimaximal Neutrino Mixing and Dirac CP Violation
  The recent results from T2K and MINOS experiments point towards a relatively large value of the reactor angle \theta_13 in the lepton sector. In this paper we show how a large \theta_13 can arise from the charged lepton sector alone in the context of an SU(5) GUT. In such a scenario (tri-)bimaximal mixing in the neutrino sector is still a viable possibility. We also analyse the general implications of the considered scenario for the searches of CP violation in neutrino oscillations. 
David Marzocca, Serguey T. Petcov, Andrea Romanino, Martin Spinrath
hep-ph