Measurement of $CP$ asymmetries in $B^0 \to \phi K_S^0$ decays with Belle II

Sumitted to PubDB: 2023-02-22

Category: Physics / performance paper

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Principal Authors Chunhui Chen, James Cochran, Soeren Prell, Michele Veronesi
Date 2023-10-01
Working group Time Dependent CP Violation
Belle II Number BELLE2-PUB-PH-2023-026
Abstract We present a measurement of time-dependent rate asymmetries in $B^0\to \phi K^0_S$ decays to search for non-standard-model physics in $b\to q \overline{q}s$ transitions. The data sample is collected with the Belle II detector at the SuperKEKB asymmetric-energy $e^{+}e^{-}$ collider in 2019-2022 and contains $(387\pm 6)\times 10^6$ bottom-antibottom mesons from $\Upsilon(4S)$ resonance decays. We reconstruct $162\pm17$ signal events and extract the charge-parity ($CP$) violating parameters from a fit to the distribution of the proper-decay-time difference of the two $B$ mesons. The measured direct and mixing-induced $CP$ asymmetries are $A=0.31\pm0.20\pm0.05$ and $S=0.54\pm0.26^{+0.06}_{-0.08}$, respectively, where the first uncertainties are statistical and the second are systematic. The results are compatible with the $CP$ asymmetries observed in $b\to c\overline{c} s$ transitions.
ArXiv https://arxiv.org/abs/2307.02802
Inspire https://inspirehep.net/literature/2711983
DOI 10.1103/PhysRevD.108.072012
Reference Phys.Rev.D 108, 072012 (2023)
Bibtex 
@article{Belle-II:2023uql,
    author = "Adachi, I. and others",
    collaboration = "Belle-II",
    title = "{Measurement of CP asymmetries in B0{\textrightarrow}{\ensuremath{\phi}}Ks0 decays with Belle II}",
    eprint = "2307.02802",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II preprint: 2023-012, KEK preprint: 2023-10",
    doi = "10.1103/PhysRevD.108.072012",
    journal = "Phys. Rev. D",
    volume = "108",
    number = "7",
    pages = "072012",
    year = "2023"
}
Journal Phys.Rev.D

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