Constraints on the CKM angle $\gamma$ from $B^\pm\to Dh^\pm$ decays using $D\rightarrow h^\pm h^{\prime\mp}\pi^0$ final states

TL;DR

This paper measures $CP$ violation observables in $B^\pm o Dh^\pm$ decays using LHCb data, providing new constraints on the CKM angle $\gamma$ through analysis of various $D$ decay modes and observing significant $CP$ asymmetries.

Contribution

It presents the first measurement of eleven $CP$ violation observables in $B^\pm o Dh^\pm$ decays with $D$ decays to three-body final states, improving constraints on the CKM angle $\gamma$.

Findings

Observation of the mode $B^\pm o [\pi^\pm K^\mp\pi^0]_D K^\pm$ with >7 sigma significance.

Measurement of the ratio $R_{{ m ADS}(K)} = (1.27\pm0.16\pm0.02) imes 10^{-2}$.

Evidence for large $CP$ asymmetry $A_{{ m ADS}(K)} = -0.38\pm0.12\pm0.02$.

Abstract

A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb$^{-1}$ is used to measure eleven $CP$ violation observables in $B^\pm\to Dh^\pm$ decays, where $h$ is either a kaon or a pion. The neutral $D$ meson decay is reconstructed in the three-body final states: $K^\pm\pi^\mp\pi^0$}; $\pi^+\pi^-\pi^0$; $K^+K^-\pi^0$ and the suppressed $\pi^\pm K^\mp\pi^0$ combination. The mode where a large $CP$ asymmetry is expected, $B^\pm\to [\pi^\pm K^\mp\pi^0]_DK^\pm$, is observed with a significance greater than seven standard deviations. The ratio of the partial width of this mode relative to that of the favoured mode, $B^\pm\to [K^\pm\pi^\mp\pi^0]_D K^\pm$, is $R_{{\rm ADS}(K)} = (1.27\pm0.16\pm0.02)\times 10^{-2}$. Evidence for a large $CP$ asymmetry is also seen: $A_{{\rm ADS}(K)} = -0.38\pm0.12\pm0.02$. Constraints on the CKM angle $\gamma$ are calculated from the eleven reported observables.