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.

Measurement of the time-integrated CP asymmetry in D0 → K0SK0S decays using opposite-side flavor tagging at Belle and Belle II / Belle, C., Adachi, I., Ahn, Y., Akopov, N., Alghamdi, S., Alhakami, M., Aloisio, A., Althubiti, N., Amos, K., Angelsmark, M., Ky, N.A., Antonioli, C., Asner, D. m., Atmacan, H., Aushev, T., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N. k., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 112:1(2025), pp. 012017.1-012017.9. [10.1103/8x1h-39dp]

Measurement of the time-integrated CP asymmetry in D0 → K0SK0S decays using opposite-side flavor tagging at Belle and Belle II

Dorigo, M.;Gabrielli, A.;Ganiev, E.;Gaudino, G.;Ghosh, D.;Giordano, R.;Gobbo, B.;Graziani, E.;Johnson, A.;Khan, M.;Li, Y.;Mancinelli, G.;Manfredi, R.;Mantovano, M.;Merola, M.;Park, H.;Park, J.;Park, K.;Raiz, S.;Schnell, G.;Serrano, J.;Soffer, A.;Veronesi, M.;Vitale, L.;Yuan, J.;
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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3121658
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