Regular Article - Theoretical Physics
The new physics reach of null tests with and decays
Fakultät für Physik, TU Dortmund, Otto-Hahn-Str. 4, 44221, Dortmund, Germany
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Accepted: 6 January 2020
Published online: 27 January 2020
processes are unique probes of flavor physics in the up-sector within and beyond the Standard Model (SM). SM tests with rare semileptonic charm meson decays are based on an approximate CP–symmetry, a superior GIM–mechanism, angular distributions, lepton-universality and lepton flavor conservation. We analyze the complete set of null test observables in and decays, , and find large room for new physics safely above the SM contribution. We identify signatures of supersymmetry, leptoquarks and anomaly-free –models with generation-dependent charges, for which we provide explicit examples. –effects in transitions can be sizable if both left-handed and right-handed couplings to quarks are present.
© The Author(s), 2020