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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


