First row CKM unitarity

Abstract

In this talk I briefly review the precision test of the first row CKM unitarity, focusing mainly on $V_{ud}$ and $V_{us}$ extracted from pion, kaon, neutron and superallowed nuclear beta decays. I will discuss the current status of several important Standard Model theory inputs to these processes, and the need for future improvements.

References added

Cited by in corpus (1)

• Leptonic Operators for Cabbibo Angle Anomaly with SMEFT RG Evolution