The new physics reach of null tests with $$D \rightarrow \pi \ell \ell $$ and $$D_s \rightarrow K \ell \ell $$ decays

@article{Bause2019TheNP,
  title={The new physics reach of null tests with \$\$D \rightarrow \pi \ell \ell \$\$ and \$\$D\_s \rightarrow K \ell \ell \$\$ decays},
  author={Rigo Bause and Marcel Golz and Gudrun Hiller and Andrey Tayduganov},
  journal={European Physical Journal C},
  year={2019},
  volume={80},
  pages={65}
}
$$|\Delta c|=|\Delta u|=1$$ 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 $$D \rightarrow \pi \ell \ell ^{(\prime )}$$ and $$D_s \rightarrow K \ell \ell ^{(\prime )}$$ decays, $$\ell… 
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