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The Standard Model of particle physics describes the known fundamental interactions with remarkable precision, yet it leaves several firmly established observations unexplained and is therefore understood as the low energy limit of a more complete theory. This thesis pursues such physics beyond the ...

We explain the difference between the measured decay widths of $b \to c \tau \nu$ processes and of $B \to K \nu \bar{\nu}$ and their values predicted in the Standard Model by introducing the right-handed interactions both to quarks and to leptons. At low energy scales, in addition to the Standard Mo ...

We argue that a detailed analysis of semileptonic decays can test the possibility of a massive neutrino. The key observable, related to the forward–backward asymmetry, is exactly zero for a massless neutrino but becomes nonzero if the neutral lepton is heavy and interacts with Standard Model fields ...