Speaker
Description
Rare $\vert \Delta c \vert=\vert \Delta u \vert=1$ processes constitute unique flavor probes in the up-sector of the Standard Model. Semileptonic FCNC decays of charmed baryons, such as $\Lambda_c\to p \mu^+\mu^-$, offer a large set of clean null test observables such as CP-asymmetries, lepton-universality ratios, missing energy modes, lepton flavor violating modes and angular observables. In these observables any signal cleanly indicates Physics Beyond the Standard Model. A variety of rare charm baryon modes exists ($\Lambda_c\to p \mu^+\mu^-,\,\Xi_c^{0,\,+}\to \Sigma^{0,\,+} \mu^+\mu^-,\,\Xi_c^0\to \Lambda^0 \mu^+\mu^-,\,\Omega_c^0\to \Xi^0 \mu^+\mu^-$) and complements similar analyses of charmed meson decays.
Along with sizable charm production rates at current flavor facilities, null test searches provide a formidable road in the search for New Physics scenarios, such as leptoquarks, $Z^\prime$- or SUSY-models. We present an overview of null test opportunities with rare charm baryon decays and give sensitivities to New Physics contributions.