$C\!P$ violation in beauty and charm quarks at LHCb

TL;DR

The LHCb experiment has made significant measurements of CP violation in beauty and charm quarks, including the first evidence of CPV in a single charm decay, with results aligning with Standard Model predictions.

Contribution

This paper reports new CP violation measurements in charm and beauty quark decays, including the first evidence of CPV in a charm decay and improved CKM parameter determination.

Findings

First evidence of CPV in a charm decay ($3.8\sigma$)

Most precise measurement of CPV in $B_s^0\to\phi\phi$ decays

Improved CKM angle $\gamma$ measurement

Abstract

The LHCb experiment has been reporting remarkable $C\!P$-violation (CPV) measurements concerning the sectors of $b$ and $c$ quarks. Recently, the new measurements of time-integrated CPV with $D^0\to K^+ K^-$ decays led to the first evidence ($3.8\sigma$) of CPV in a single charmed decay. The first search for CPV in the $D_{(s)}^+\to K^+K^+K^-$ decays was executed. The knowledge of the CKM parameter $\gamma$ was improved by new results; the current combination of the LHCb measurements is: $\left(63.8^{+3.5}_{-3.7}\right)^\circ$. The study of $B_s^0\to\phi\phi$ decays resulted in the most precise measurement of time-dependent CPV in any penguin-dominated $B$ meson decay. All the results are consistent with the Standard-Model predictions.