Study of Branching fraction and CP Asymmetry of charm mesons at Belle

Abstract

𝐶𝑃 violation in charm meson decays is expected to be small within the Standard Model (SM) framework, and an observation of a large 𝐶𝑃 asymmetry could indicate new physics. We report measurement of branching fractions and direct 𝐶𝑃 asymmetries 𝐴 𝐶𝑃 in 𝐷 0 → 𝜋 + 𝜋 − 𝜂, 𝐾 + 𝐾 − 𝜂, 𝜙𝜂 and 𝐷 0 → 𝐾 0 𝑆 𝐾 0 𝑆 𝜋 + 𝜋 − decays. For the latter the T-odd asymmetry 𝑎 𝑇𝐶𝑃 sensitive to 𝐶𝑃 violation in the decay, is also measured. This report also covers the search for CP violation in 𝐷 → 𝐾ℎ𝜋𝜋 0 ( ℎ = 𝜋, 𝐾 ) decays. The results are based on the full data collected with the Belle detector at the KEKB asymmetric-energy 𝑒 + 𝑒 − collider.