TL;DR
This paper reviews the current status of testing the unitarity of the first row of the CKM matrix, emphasizing the precision measurements of $V_{ud}$ and $V_{us}$ from various decay processes and the importance of improving theoretical inputs.
Contribution
It provides a comprehensive overview of the latest experimental and theoretical efforts to verify CKM unitarity, highlighting areas needing future refinement.
Findings
Current measurements suggest CKM unitarity is consistent within uncertainties.
Significant theoretical inputs are crucial for accurate extraction of CKM elements.
Future improvements in theory and experiment are necessary for more precise tests.
Abstract
In this talk I briefly review the precision test of the first row CKM unitarity, focusing mainly on and 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.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Nuclear physics research studies