Parametrization of Neutrino Mixing Matrix in Tri-bimaximal Mixing   Pattern
  The neutrino mixing matrix is expanded in powers of a small parameter $\lambda$ in tri-bimaximal mixing pattern. We also present some applications of this parametrization, such as to the expression of the Jarlskog parameter $J$. Comparing with other parametrizations (such as the parametrization in bimaximal mixing pattern), this parametrization converges more quickly, but is of less symmetry. 
Nan Li, Bo-Qiang Ma