Study of direct CP in charmed B decays and measurement of the CKM angle gamma at Belle

TL;DR

This paper reports a precise measurement of the CKM angle gamma using B meson decays at the Belle experiment, providing key insights into CP violation in charm and beauty quark systems.

Contribution

The study combines multiple decay channels to achieve the most precise measurement of gamma to date at Belle.

Findings

Measured gamma = (68^{+15}_{-14}) degrees, the most precise to date.

Used a large dataset of 770 fb^-1 from the Belle experiment.

Improved understanding of direct CP violation in charmed B decays.

Abstract

The Belle experiment, running at the KEKB e^+ e^- asymmetric energy collider during the first decade of the century, has recorded 770 fb^-1 of data at the Upsilon(4S) resonance. A combination of recent Belle results obtained with this sample is used to perform a measurement of the CKM angle gamma. We use B^+- -> DK^+- and B^+- -> D^*K^+- decays where the D meson decays into K_S^0pi+pi-, Kpi, KK, pipi, K_S^0 pi^0 and K_S^0 eta final states and D^* decays into Dpi^0 and Dgamma. Belle obtains the most precise gamma measurement to date, gamma = (68^{+15}_{-14}) degree.