Measurement of the branching fraction and 𝐶𝑃-violating asymmetry of the decay 𝐵⁰ →𝜋⁰𝜋⁰ using 387 million ϒ(4𝑆) decays in Belle II data
Date
2025
Authors
Adachi, I.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Alhakami, M.
Aloisio, A.
Althubiti, N.
Anh Ky, N.
Asner, D.M.
Atmacan, H.
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Advisors
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Journal article
Citation
Physical Review D, 2025; 111(7):L071102-1-L071102-10
Statement of Responsibility
Belle II Collaboration
Conference Name
Abstract
We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B⁰ → π⁰π⁰ decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387 × 10⁶ ϒ(4S) mesons. Using an optimized event selection, we find 125 ± 20 signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is (1.25 ± 0.23) × 10⁻⁶ and the CP-violating asymmetry is 0.03 ± 0.30.
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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
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