Measurements of the CKM angle $\gamma$ and parameters related to mixing and CP violation in the charm at LHCb

TL;DR

This paper reports precise measurements of the CKM angle gamma and charm mixing parameters from LHCb, improving understanding of CP violation and mixing phenomena in charm and B meson decays.

Contribution

It provides a combined measurement of gamma and charm parameters, and introduces new LHCb measurements using specific B decay channels with D to K_S^0 h+ h- final states.

Findings

Gamma measured as (63.8^{+3.5}_{-3.7}) degrees.

Improved precision on the strong-phase difference δ_{Kπ}^D.

Enhanced constraints on the D^0-ar{D}^0 mixing parameter y.

Abstract

A recent combination of measurements performed by the LHCb collaboration determined that $\gamma=(63.8^{+3.5}_{-3.7})^\circ$. The fit combined the results of $\gamma$ and charm measurements, which resulted in precision improvements for the strong-phase difference between $D^0 \to K^-\pi^+$ and $D^0 \to K^+\pi^-$ decays, $\delta_{K\pi}^{D}$, and the $D^0-\bar{D}^0$ mixing parameter, $y$. In addition, new LHCb measurements of the CKM angle $\gamma$ using $B^0 \to D K^{*0}$ and $B^- \to D^{*} K^-$ decays with the $D\to K_{S}^0 h^+ h^-$ final state (where $h=\pi,K$) are presented.