Measurement of the branching fraction, polarization, and time-dependent asymmetry in decays and constraint on the CKM angle
Collaboration
15 pages
e-Print:
- 2412.19624 [hep-ex]
Report number:
- Belle II preprint 2024-024,
- KEK preprint 2024-23
Experiments:
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Citations per year
0 Citations
Abstract: (arXiv)
We present a measurement of the branching fraction and fraction of longitudinal polarization of decays, which have two 's in the final state. We also measure time-dependent violation parameters for decays into longitudinally polarized pairs. This analysis is based on a data sample containing \BBbar pairs collected with the Belle~II detector at the SuperKEKB asymmetric-energy collider in 2019-2022. We obtain , , and , where the first uncertainties are statistical and the second are systematic. We use these results to perform an isospin analysis to constrain the CKM angle and obtain two solutions; the result consistent with other Standard Model constraints is .References(56)
Figures(4)
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