Several topics on CP violation in the lepton sector are reviewed. A few theoretical aspects
concerning neutrino masses, leptonic mixing, and CP violation will be covered, with special …

Analytic expressions of lepton-flavour-and lepton-number-violating decays of charged
leptons are derived in the context of general SU (2) L⊗ U (1) Y seesaw scenarios that are …

We analyze the decay KL→ π 0ν ν in a model independent way. If lepton flavor is conserved
the final state is (to a good approximation) purely CP even. In that case this decay mode …

There are theoretical and phenomenological motivations that there may exist additional
heavy Z′ bosons with family nonuniversal couplings. Flavor mixing in the quark and lepton …

We obtain limits on generic vectorlike leptons at the TeV scale from electroweak precision
tests. These limits are complementary to the ones obtained from lepton flavor violating …

The mixing of the known quarks with new heavy singlets can modify significantly some
observables with respect to the standard model predictions. We analyze the range of …

A bstract We point out that hints of deviations from unitarity in the first row of the CKM matrix
may be explained by the presence of a single vector-like top. We study how the stringent …

Within a class of superstring vacua which have an additional nonanomalous U (1)′ gauge
factor, we address the scale of the U (1)′ symmetry breaking and constraints on the exotic …

The possibility of discovering heavy Majorana neutrinos and lepton number violation via the
like-sign dilepton signal at hadron supercolliders is investigated. The cross sections for the …

Using effective-Lagrangian techniques we perform a systematic survey of the lowest-
dimension effective interactions through which heavy physics might manifest itself in present …