Abstract :
It is a common believe that, if the tri-bimaximal mixing (TBM) pattern is explained by vacuum alignment in an image model, only a very small reactor angle, say image being image the Cabibbo angle, can be accommodated. This statement is based on the assumption that all the flavon fields acquire VEVs at a very similar scale and the departures from exact TBM arise at the same perturbation level. From the experimental point of view, however, a relatively large value image is not yet excluded by present data. In this paper, we propose a seesaw image model in which the previous assumption can naturally be evaded. The aim is to describe a image without conflicting with the TBM prediction for image which is rather close to the observed value (at image level). In our model the deviation of the atmospherical angle from maximal is subject to the sum-rule: image which is a next-to-leading order prediction of our model.
