We measure the time-integrated CP asymmetry in D0 → K 0S K 0S decays reconstructed in e+e− → cc̄ events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb−1 , respectively. The D0 decays are required to originate from the D*+ → D0 π+ 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 (stat) ± 0.1 (syst))%, is consistent with previous determinations and with CP symmetry.
Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2025). Measurement of the time-integrated CP asymmetry in D0→KS0KS0 decays using Belle and Belle II data. PHYSICAL REVIEW D, 111(1), 012015-1-012015-11 [10.1103/physrevd.111.012015].
Measurement of the time-integrated CP asymmetry in D0→KS0KS0 decays using Belle and Belle II data
Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martellini, C.Membro del Collaboration Group
;Martini, A.Membro del Collaboration Group
;
2025-01-01
Abstract
We measure the time-integrated CP asymmetry in D0 → K 0S K 0S decays reconstructed in e+e− → cc̄ events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb−1 , respectively. The D0 decays are required to originate from the D*+ → D0 π+ 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 (stat) ± 0.1 (syst))%, is consistent with previous determinations and with CP symmetry.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


