Measurements of observables for B→K∗γ decays at Belle II

Sumitted to PubDB: 2024-11-27

Category: Physics / performance paper

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Principal Authors Gagan Mohanty, Saurabh Sandilya, Rahul Tiwary
Non-Belle II authors Soumen Halder
Date 2026-04-02
Working group Radiative and Electroweak Penguin
Belle II Number BELLE2-PUB-DRAFT-2024-004
Abstract We present measurements of B → K∗γ decays using 362 fb−1 of data collected from 2019 to 2022 by the Belle II experiment running at the SuperKEKB asymmetric-energy e+e− collider. This data sample contains (387 ± 6) × 106 BB events. Branching fractions (B) and CP asymmetries (ACP) are measured for both B0 → K∗0γ and B+ → K∗+γ decays. The CP asymmetry difference (∆ACP) and isospin asymmetry (∆0+) between neutral and charged channels are also measured. We obtain: B[B0 → K∗0γ] = (4.16 ± 0.10 ± 0.11) × 10−5, B[B+ → K∗+γ] = (4.04 ± 0.13 ± 0.13) × 10−5, ACP [B0 → K∗0γ] = (−3.2 ± 2.4 ± 0.4)%, ACP [B+ → K∗+γ] = (−1.0 ± 3.0 ± 0.6)%, ∆ACP = (2.2 ± 3.8 ± 0.7)%, and ∆0+ = (5.1 ± 2.0 ± 1.5)%, where the first uncertainty is statistical and the second is systematic. The results are consistent with world-average values as well as with theoretical expectations.
ArXiv https://arxiv.org/abs/2411.10127
Inspire https://inspirehep.net/literature/2849099
DOI 10.1007/JHEP09(2025)024
Reference JHEP 09, 024 (2025)
Bibtex 
@article{Belle-II:2024kbc,
    author = "Adachi, I. and others",
    collaboration = "Belle-II",
    title = "{Measurement of B {\textrightarrow} K$^{*}$(892){\ensuremath{\gamma}} decays at Belle II}",
    eprint = "2411.10127",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2024-029; KEK Preprint 2024-31, Belle II Preprint 2024-029, KEK Preprint 2024-31",
    doi = "10.1007/JHEP09(2025)024",
    journal = "JHEP",
    volume = "09",
    pages = "024",
    year = "2025"
}

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