Measurement of CP asymmetries in B0 →η′ KS0 decays at Belle II

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  (Published version)

Date

2024

Authors

Adachi, I.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Akopov, N.
Aloisio, A.
Anh Ky, N.
Asner, D.M.
Atmacan, H.
Aushev, T.

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Journal article

Citation

Physical Review D (particles, fields, gravitation, and cosmology), 2024; 110(11):112002-1-112002-12

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Belle II Collaboration

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DOI

10.1103/physrevd.110.112002

Abstract

We describe a measurement of charge-parity (CP) violation asymmetries in B0 → η0 K0 S decays using Belle II data. We consider η0 → ηð→γγÞπþπ− and η0 → ρð→πþπ−Þγ decays. The data were collected at the SuperKEKB asymmetric-energy eþe− collider between the years 2019 and 2022, and contain ð387 6Þ × 106 bottom-antibottom meson pairs. We reconstruct 829 35 signal decays and extract the CP 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 CP asymmetries are Cη0 K0 S ¼ −0.19 0.08 0.03 and Sη0 K0 S ¼ þ0.67 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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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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http://purl.org/au-research/grants/arc/DP200101792
 http://purl.org/au-research/grants/arc/DP210101900
 http://purl.org/au-research/grants/arc/DP210102831
 http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/LE210100098
 http://purl.org/au-research/grants/arc/LE230100085

Published Version

https://doi.org/10.1103/physrevd.110.112002

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Persistent link to this record

https://hdl.handle.net/2440/144513