https://doi.org/10.1140/epjc/s10052-020-7621-7
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
c
ghiller@physik.uni-dortmund.de
Received:
30
September
2019
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
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Funded by SCOAP3
