Abstract
|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 ^{(prime )}=e, mu , and find large room for new physics safely above the SM contribution. We identify signatures of supersymmetry, leptoquarks and anomaly-free U(1)^prime –models with generation-dependent charges, for which we provide explicit examples. Z^prime –effects in c rightarrow u ell ell ^{(prime )} transitions can be sizable if both left-handed and right-handed couplings to quarks are present.
Highlights
New physics (NP) can be probed in rare semileptonic charm decays [1,2,3,4,5,6,7]
Standard Model (SM) tests with rare semileptonic charm meson decays are based on an approximate CP–symmetry, a superior GIM–mechanism, angular distributions, leptonuniversality and lepton flavor conservation
Null tests are based on approximate symmetry limits, which follow from parametric or structural features of the Standard Model (SM) that do not have to be present in general models beyond the SM+3νR (the SM)
Summary
New physics (NP) can be probed in rare semileptonic charm decays [1,2,3,4,5,6,7]. Already key to ongoing and future precision programs in rare semileptonic b-decays [8,9], are indispensable when methods to achieve sufficient theoretical control on decay amplitudes are not available. This is exactly the case in charm decays, subject to notorious resonance pollution and poor convergence of the heavy quark expansion [10]. We discuss exclusive rare charm meson decays in the SM.
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