Speaker
Mr
Rigo Bause
(TU Dortmund)
Description
Rare $|\Delta c|=|\Delta u|=1$ processes are unique probes of flavour physics in the Standard Model (SM) and beyond and provide an excellent opportunity to analyse CP-violation and search for new physics (NP) due to their strong GIM-suppression in the SM.
Furthermore, a variety of null test observables is available for decays, such as $D\to \pi \ell^+ \ell^-$, $\ell = e,\,\mu$, and provide vital insight into possible NP signals and tests of lepton universality can be performed in charm.
The observation of direct CP-violation in hadronic decays, $\Delta A_{\text{CP}}$, draws a connection to semileptonic decays,
like in the case of flavourful, anomaly-free $U(1)^\prime$-extensions, where a NP-interpretation of $\Delta A_{\text{CP}}$ indicates measurable CP-asymmetries in $c\to u \ell^+ \ell^-$ transitions and vice versa.
In this talk we present a study (from the work 2004.01206) on CP-violating NP linking semileptonic and hadronic rare charm decays and discuss a selection of $Z^\prime$-models that generate U-spin and isospin breaking which can be probed in patterns of hadronic decays of charm mesons.
Signatures for CP-asymmetries in $D^0 \to \pi^+\pi^-$, $D^0 \to K^+K^-$ and $D^0 \to \pi^0\pi^0$, $D^+ \to \pi^+ \pi^0$ as well as potential deviations from the universality limit in $D \to \pi \ell^+ \ell^-$ are provided as well.
Primary authors
Prof.
Gudrun Hiller
(TU Dortmund)
Hector Gisbert
(TU Dortmund)
Marcel Golz
(TU Dortmund)
Mr
Rigo Bause
(TU Dortmund)
