Paride Paradisi

We review the experimental status of CP violation in charm systems and its impact on New Physics scenarios. We emphasize that the synergy of low-energy flavor data with the high-p T part of the LHC program will teach us a lot about new dynamics at the TeV scale (if any) with the upcoming 14 TeV LHC run. VI Italian workshop on p-p physics at the LHC,

We argue that the anomalous magnetic moment of the electron (a _e ) can be used to probe new physics. We show that the present bound on new-physics contributions to a _e is 8 × 10⁻¹³, but the sensitivity can be improved by about an order of magnitude with new measurements of a _e and more refined determinations of α in atomic-physics experiments. Tests on new-physics effects in a _e can play a crucial role in the interpretation of the observed discrepancy in the anomalous magnetic moment of the muon (a _μ ). In a large class of models, new contributions to magnetic moments scale with the square of lepton masses and thus the anomaly in a _μ suggests a new-physics effect in a _e of (0.7 ± 0.2) × 10⁻¹³. We also present examples of new-physics theories in which this scaling is violated and larger effects in a _e are expected. In such models the value of a _e is correlated with specific predictions for processes with violation of lepton number or lepton universality, and with the electric dipole moment of the electron.

In the context of minimal supersymmetry with slepton mass universality we find that an enhancement in h → γγ by at least 40%, as hinted by present data, implies a deviation of the muon anomalous magnetic moment by exactly the right amount to explain the observed anomaly. The enhancement in h → γγ selects a light stau with large left-right mixing, a light Bino, and heavy higgsinos. The corresponding parameters are compatible with thermal dark matter, predict small deviations in h → Zγ and h → ττ, and measurable violations of lepton universality.

We analyze possible interpretations of the recent LHCb evidence for CP violation in D meson decays in terms of physics beyond the Standard Model. On general grounds, models in which the primary source of flavor violation is linked to the breaking of chiral symmetry (left-right flavor mixing) are natural candidates to explain this effect, via enhanced chromomagnetic operators. In the case of supersymmetric models, we identify two motivated scenarios: disoriented A-terms and split families. These structures predict other non-standard signals, such as nuclear EDMs close to their present bounds and, possibly, tiny but visible deviations in K and B physics, or even sizable flavor-violating processes involving the top quark or the stops. Some of these connections, especially the one with nuclear EDMs, hold beyond supersymmetry, as illustrated with the help of prototype non-supersymmetric models.