We measure the time-integrated CP asymmetry in D0 → K0SK0S decays reconstructed in e+e- → c¯c events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb-1, respectively. To infer the flavor of the D0 meson, we exploit the correlation between the flavor of the reconstructed decay and the electric charges of particles reconstructed in the rest of the e+e− → c¯c event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, ACP(D0 → K0SK0S) =(1.3 ± 2.0 ± 0.2)%, where the first uncertainty is statistical and the second systematic, is consistent with previous determinations and with CP symmetry.
Adachi, I., Ahn, Y., Akopov, N., Alghamdi, S., Alhakami, M., Aloisio, A., et al. (2025). Measurement of the time-integrated CP asymmetry in D0→KS0KS0 decays using opposite-side flavor tagging at Belle and Belle II. PHYSICAL REVIEW D, 112(1), 012017-1-012017-9 [10.1103/8x1h-39dp].
Measurement of the time-integrated CP asymmetry in D0→KS0KS0 decays using opposite-side flavor tagging at Belle and Belle II
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
;Salutari, L.Membro del Collaboration Group
;
2025-01-01
Abstract
We measure the time-integrated CP asymmetry in D0 → K0SK0S decays reconstructed in e+e- → c¯c events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb-1, respectively. To infer the flavor of the D0 meson, we exploit the correlation between the flavor of the reconstructed decay and the electric charges of particles reconstructed in the rest of the e+e− → c¯c event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, ACP(D0 → K0SK0S) =(1.3 ± 2.0 ± 0.2)%, where the first uncertainty is statistical and the second systematic, 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.


