Observation of time-dependent violation and measurement of the branching fraction of decays
Collaboration
11 pages
Published in:
- Phys.Rev.D 111 (2025) 1, 012011
- Published: Jan 1, 2025
e-Print:
- 2410.08622 [hep-ex]
DOI:
- 10.1103/PhysRevD.111.012011 (publication)
Report number:
- Belle II preprint: 2024-018,
- KEK preprint: 2024-14
Experiments:
View in:
Citations per year
Abstract: (APS)
We present a measurement of the branching fraction and time-dependent charge-parity () decay-rate asymmetries in decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric collider in 2019–2022 and contains meson pairs from decays. We reconstruct signal decays and fit the parameters from the distribution of the proper-decay-time difference of the two mesons. We measure the branching fraction to be and the direct and mixing-induced asymmetries to be and , respectively, where the first uncertainties are statistical and the second are systematic. We observe mixing-induced violation with a significance of 5.0 standard deviations for the first time in this mode.References(50)
Figures(0)
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