We measure the time-integrated CP asymmetry in D-0 -> (KSKS0)-K-0 decays reconstructed in e(+)e(-) -> c (c) over bar 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 D-0 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) over bar event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, A(CP)(D-0 -> (KSKS0)-K-0) = (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 → KS0 KS0 decays using opposite-side flavor tagging at Belle and Belle II
F. Bianchi;A. Boschetti;M. Destefanis;M. Maggiora;S. Marcello;S. Spataro;F. Testa;
2025-01-01
Abstract
We measure the time-integrated CP asymmetry in D-0 -> (KSKS0)-K-0 decays reconstructed in e(+)e(-) -> c (c) over bar 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 D-0 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) over bar event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, A(CP)(D-0 -> (KSKS0)-K-0) = (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.| File | Dimensione | Formato | |
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