PJC: Kristjan Müürsepp: "Flavour as a gateway to hints of new physics"

Thursday 6 Mar 2025, 13:30 → 15:00 Europe/Rome

Aula Touschek (Sapienza)

In the first part of the talk I will elaborate on the possibility that the 2.7 sigma deviation of the B+ -> K+ + missing energy signal from the Standard Model (SM) prediction can be explained by a dark photon which has interactions with the SM only via higher dimensional operators. I will also briefly touch upon the complementary process B0 -> K0 + missing energy that allows placing a lower bound on the cut-off scale for the operators connecting the dark photon to the SM. Finally, to highlight the predictivity of the model I will mention the resulting prediction for the decay B^0_s -> phi + missing energy. In the second part of the talk, I will introduce a novel high-energy test of CKM unitarity violation via WW-scattering. I will explain the idea, based on the anomalous growth of the WW scattering cross section with the center of mass energy, and estimate the resulting bounds on the unitarity violation from the recent ATLAS measurement of pp-> WW. Finally, I present forecasts for high-lumi LHC and future colliders.