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Measurement of C P asymmetries in B 0 → η ′ K S 0 decays at Belle II
We describe a measurement of charge-parity ( C P ) violation asymmetries in B 0 → η ′ K S 0 decays using Belle II data. We consider η ′ → η ( → γ γ ) π + π − and η ′ → ρ ( → π + π − ) γ decays. The data were collected at the SuperKEKB asymmetric-energy e + e − collider between the years 2019 and 202...
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Published in: | Physical review. D 2024-12, Vol.110 (11), Article 112002 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | We describe a measurement of charge-parity ( C P ) violation asymmetries in B 0 → η ′ K S 0 decays using Belle II data. We consider η ′ → η ( → γ γ ) π + π − and η ′ → ρ ( → π + π − ) γ decays. The data were collected at the SuperKEKB asymmetric-energy e + e − collider between the years 2019 and 2022, and contain ( 387 ± 6 ) × 10 6 bottom-antibottom meson pairs. We reconstruct 829 ± 35 signal decays and extract the C P violating parameters from a fit to the distribution of the proper-decay-time difference between the two B mesons. The measured direct and mixing-induced C P asymmetries are C η ′ K S 0 = − 0.19 ± 0.08 ± 0.03 and S η ′ K S 0 = + 0.67 ± 0.10 ± 0.03 , respectively, where the first uncertainties are statistical and the second are systematic. These results are in agreement with current world averages and standard model predictions. |
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ISSN: | 2470-0010 2470-0029 |
DOI: | 10.1103/PhysRevD.110.112002 |