Measurement of time-integrated CP Asymmetry of D^0 → KSKS decay (Belle + Belle II)

Sumitted to PubDB: 2024-11-27

Category: Proceeding, Visibility: Public

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Authors	Kavita Lalwani
Date	Nov. 16, 2024
Belle II Number	BELLE2-CONF-PROC-2024-031
Abstract	We measure the time-integrated CP asymmetry, ACP , in D^0 →KsKs decays reconstructed in e+e− → ccbar events collected by Belle and Belle II experiments. The full Belle data sample is used, corresponding to an integrated luminosity of 980fb^−1. For Belle II, the data collected before long shutdown 1 are used, and correspond to an integrated luminosity of 427 fb^−1. The D^0 decays are required to come from the flavor-conserving D^∗+ → D^0π^+ decay (D^∗+ tag) to determine the charm flavor at production time. A control sample of D^∗+-tagged D^0 → K^+K^− is used to correct for production and detection asymmetries. The result, Acp(D^0→KsKs) = (-1.4 ± 1.3(stat) ± 0.1(syst))% , is consistent with previous determinations and with CP symmetry.