Measurement of the time-integrated CP asymmetry in D⁰→ K⁰_SK⁰_S decays using Belle and Belle II data

2024/11/01 by Belle, Collaborations, Belle II, : +360
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2411.00306

Abstract

We measure the time-integrated CP asymmetry in D⁰ → K⁰_SK⁰_S decays reconstructed in e⁺e^- → cc events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 fb^-1 and 428 fb^-1, respectively. The D⁰ decays are required to originate from the D^*+ → D⁰π⁺ decay, which determines the charm flavor at production time. A control sample of D⁰ → K⁺K^- decays is used to correct for production and detection asymmetries. The result, (-1.4±1.3\rm(stat)±0.1\rm (syst))%, is consistent with previous determinations and with CP symmetry.

Related

• Measurement of the time-integrated CP asymmetry in D⁰→π⁰π⁰ decays at Belle II
• Measurement of the time-integrated CP asymmetry in D⁰ → K⁰_{\rm S} K⁰_{\rm S} decays using opposite-side flavor tagging at Belle and Belle II
• Measurement of CP asymmetry in the D⁰ → K⁰_S K⁰_S decay at Belle
• Measurement of the CP asymmetry in D⁰→π⁺π^-π⁰ decays at Belle II
• CP violation in D⁰ → K_S⁰ K_S⁰ decay at Belle