We perform a measurement of time-dependent CP violation parameters in decays using a dataset of approximately 772 & times; 106 and 521 & times; 106 Upsilon(4S) decays collected by the Belle and Belle II experiments, respectively. The measured parameters for the combined dataset in the K *0(892) dominated region ( GeV/c 2) are S = 0.09 +/- 0.16 +/- 0.02 and C = -0.09 +/- 0.08 +/- 0.04. For the non-K *0(892) region ( GeV/c 2), the corresponding values are S = -0.32 +/- 0.33 +/- 0.09 and C = -0.07 +/- 0.17 +/- 0.08. The first quoted uncertainties are statistical, while the second ones are systematic. These results are consistent with Standard Model predictions and more precise than previous measurements.

Measurement of time-dependent CP violation parameters in decays at Belle and Belle II

Benfratello, G. F.;Bertacchi, V.;Bettarini, S.;Carminati, M.;Casarosa, G.;Cho, K.;Choudhury, S.;Corona, L.;de Marino, G.;De Pietro, G.;Forti, F.;Lueck, T.;Massaccesi, L.;Moneta, S.;Rizzo, G.;Salutari, L.;Trantou, F. F.;Zani, L.;
2026-01-01

Abstract

We perform a measurement of time-dependent CP violation parameters in decays using a dataset of approximately 772 & times; 106 and 521 & times; 106 Upsilon(4S) decays collected by the Belle and Belle II experiments, respectively. The measured parameters for the combined dataset in the K *0(892) dominated region ( GeV/c 2) are S = 0.09 +/- 0.16 +/- 0.02 and C = -0.09 +/- 0.08 +/- 0.04. For the non-K *0(892) region ( GeV/c 2), the corresponding values are S = -0.32 +/- 0.33 +/- 0.09 and C = -0.07 +/- 0.17 +/- 0.08. The first quoted uncertainties are statistical, while the second ones are systematic. These results are consistent with Standard Model predictions and more precise than previous measurements.
2026
Null, Null; Abumusabh, M.; Adachi, I.; Aggarwal, A.; Ahn, Y.; Aihara, H.; Akdag, M.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Althubiti, N.; Amos, K.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1376727
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