2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226401Current data indicates that lepton mixing is very close to the tri-bimaximal mixing scenario. In general, however, one expects deviations from any mixing scenario. We discuss several examples to perturb tri-bimaximal mixing, namely soft breaking, renormalization group running and charged lepton corrections. We also present a convenient parametrization of the PMNS matrix which takes advantage of the apparently close to tri-bimaximal mixing pattern. Finally, it is discussed how to generate values of U_{e3} which correspond to the recently found hint for non-zero U_{e3}.3 pages. Talk given at NOW2008, Conca Specchiulla, Otranto, Italy, September 6-13, 2008High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext