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
V. Bertacchi;S. Bettarini;G. Casarosa;L. Corona;G. de Marino;F. Forti;L. Massaccesi;S. Moneta;G. Rizzo;F. Tenchini;F. F. Trantou;L. Zani;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


