Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics

TL;DR

This paper reviews the current status of the CKM matrix fit within the Standard Model, highlighting recent experimental inputs, constraints on rare decays, and implications for potential new physics in flavor-changing processes.

Contribution

It provides an updated global fit of CKM parameters, incorporating recent measurements and analyzing constraints on $ riangle F=2$ New Physics using the CKMfitter analysis framework.

Findings

Current CKM fit consistent with Standard Model predictions

Stringent constraints on $ riangle F=2$ New Physics models

Updated measurements of $B_s o\mu\mu$ and $B_d o\mu\mu$ decays

Abstract

This letter summarises the status of the global fit of the CKM parameters within the Standard Model performed by the CKMfitter group. Special attention is paid to the inputs for the CKM angles $\alpha$ and $\gamma$ and the status of $B_s\to\mu\mu$ and $B_d\to \mu\mu$ decays. We illustrate the current situation for other unitarity triangles. We also discuss the constraints on generic $\Delta F=2$ New Physics. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical uncertainties.