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

Abstract

We measure the time-integrated CP asymmetry in $D^0\to K_S^0{K}_S^0$ decays reconstructed in $e^{+}{e}^{-}\to c\overline{c}$ 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 $D^{\ast +}\to D^0{\pi }^{+}$ decay, which determines the charm flavor at production time. A control sample of $D^0\to K^{+}{K}^{-}$ decays is used to correct for production and detection asymmetries. The result, $(-1.4\pm 1.3(\mathrm{stat})\pm 0.1(\mathrm{syst}))\%$, is consistent with previous determinations and with CP symmetry.

10 pages, 3 figures. arXiv admin note: text overlap with arXiv:2410.22961

References in corpus (13)

• PYTHIA 6.4 Physics and Manual
• An Introduction to PYTHIA 8.2
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Observation of $CP$ violation in charm decays
• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays
• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ decays
• Search for time-dependent $CP$ violation in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• A $U$-Spin Anomaly in Charm CP Violation
• Measured and projected beam backgrounds in the Belle II experiment at the SuperKEKB collider
• Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
• Measurement of $CP$ asymmetry in $D^0\to K_S^0{K}_S^0$ decays
• Search for $CP$ violation in D${}^0$ $\to$ K${}_{\mathrm{S}}^0$K${}_{\mathrm{S}}^0$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Cited by in corpus (1)

• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K_{\mathrm{S}}^0{K}_{\mathrm{S}}^0$ decays using opposite-side flavor tagging at Belle and Belle II