The Tera-Z phase of future e+e− colliders, FCC-ee and CepC, is a goldmine for exploring Z portal physics. We focus on axion-like particles (ALPs) that can be produced via Z decays with a monochromatic photon. As a template model, we consider composite Higgs models with a light pseudo-scalar that couples through the Wess-Zumino-Witten term to the electroweak gauge bosons. For both photophilic...
I will discuss the decay D to pi l+l-, providing motivation from the B physics anomalies. After having reviewed the previous status of the calculation for this decay, I will motivate our calculation where we take a new approach to the the resonance contributions and include for the first time the relatively large contributions from the weak annihilation diagrams. I will then discuss the...
The Majorana nature of neutrinos and whether lepton number symmetry is conserved are among the most pressing mysteries in physics today. This follows from their widespread implications for cosmology, nuclear physics, and particle physics. Along these lines, searches for the neutrinoless beta beta (0vBB) decay mode of heavy nuclei are highly sensitive probes of these questions, albeit with...
The nature of Dark Matter (DM) is one of the greatest puzzles of modern
particle physics and cosmology. Although overwhelming observational
evidences from galactic to cosmological scales point to the existence of
DM, after decades of experimental effort only its gravitational
interaction has been experimentally confirmed. Currently, we do not have
any clue on DM properties, such as...
