Neutrino parameters from matter effects in $P_{ee}$ at long baselines
  We show that the earth matter effects in the ${\rm {\nu_e \to \nu_e}}$ survival probability can be used to cleanly determine the third leptonic mixing angle $\theta_{13}$ and the sign of the atmospheric neutrino mass squared difference, $\Delta m^2_{31}$, using a $\beta$-beam as a $\nu_e$ source. 
Sanjib Kumar Agarwalla, Sandhya Choubey, Srubabati Goswami and Amitava   Raychaudhuri