# The CKM Parameters

## TL;DR

This paper reviews the CKM matrix's role in quark flavor physics, summarizing experimental constraints, theoretical inputs, and recent precision improvements from B factories and LHCb data, including fits within the Standard Model and New Physics scenarios.

## Contribution

It provides a comprehensive review of the latest experimental and theoretical constraints on the CKM matrix, including updated fits and model-independent analyses of New Physics.

## Key findings

- Improved precision in CKM parameter measurements
- Updated fits of CKM matrix within the Standard Model
- Analysis of potential New Physics effects

## Abstract

The Cabibbo-Kobayashi-Maskawa matrix is a key element to describe flavour dynamics in the Standard Model. With only four parameters, this matrix is able to describe a large range of phenomena in the quark sector, such as CP violation and rare decays. It can thus be constrained by many different processes, which have to be measured experimentally with a high accuracy and computed with a good theoretical control. With the advent of the B factories and the LHCb experiment taking data, the precision has significantly improved recently. The most relevant experimental constraints and theoretical inputs are reviewed and fits to the CKM matrix are presented for the Standard Model and for some topical model-independent studies of New Physics.