Experimental overview of CKM metrology from kaon physics

There is currently a significant tension between the prediction from the unitarity of the first row of the CKM matrix, |Vud|² +|Vᵤₛ|² + |Vub|² =1, and measurements. This is known as the Cabibbo angle anomaly, with the tension corresponding to around three standard deviations. Precision measurements linked to kaon physics can provide insights into Vud and Vᵤₛ. In particular, studies of K→πν decays can provide a measurement of Vᵤₛ and the ratio between the rates of K±→μ±ν and π±→μ±ν decays can provide a measurement of the ratio |Vᵤₛ|/|Vud|. Future measurements of these CKM parameters using current and future experiments can play a crucial role in resolving the current tension between observations and the prediction from unitarity. In these proceedings the current state-of-the-art in CKM metrology from kaon physics is presented, and future prospects are summarised.