Measurement of the time-integrated CP asymmetry in $D^0 \to K^0_S K^0_S$ decays using Belle and Belle II data

Abstract We measure the time-integrated CP asymmetry in $D^{0} \rightarrow K^{0}_{S}K^{0}_{S}$ decays reconstructed in $e^{+}e^{-} \rightarrow c\overline{c}$ 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 $D^{0}$ decays are required to originate from the $D^{*+} \rightarrow D^{0}π^{+}$ decay, which determines the charm flavor at production time. A control sample of $D^{0} \rightarrow K^{+}K^{-}$ decays is used to correct for production and detection asymmetries. The result, $(-1.4\pm1.3{\rm(stat)}\pm0.1{\rm (syst)})\%$, is consistent with previous determinations and with CP symmetry.
Tags
Working group Charm
Principal authors @  Sanjeeda Das, Angelo Di Canto, Kavita Lalwani
Reference Phys.Rev.D 111, 012015 (2025), DOI: 10.1103/PhysRevD.111.012015
Document BELLE2-PUB-PH-2024-048
Links arXiv:2411.00306, Inspire, PRD
Bibtex 
@article{Belle:2024vho,
    author = "Adachi, I. and others",
    collaboration = "Belle, Belle-II",
    title = "{Measurement of the time-integrated CP asymmetry in D0{\textrightarrow}KS0KS0 decays using Belle and Belle II data}",
    eprint = "2411.00306",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "KEK Preprint 2024-26, Belle II Preprint 2024-026",
    doi = "10.1103/PhysRevD.111.012015",
    journal = "Phys. Rev. D",
    volume = "111",
    number = "1",
    pages = "012015",
    year = "2025"
}