Search for CP violation in $D^+_{(s)}\to K_S^0K^-\pi^+\pi^+$ decays

Sumitted to PubDB: 2024-07-05

Category: Physics / performance paper

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Principal Authors Kay Kinoshita, Longke Li, Alan Schwartz
Date 2026-04-02
Working group Charm
Belle II Number BELLE2-PUB-DRAFT-2024-011
Abstract We perform the first search for $C\!P$ violation in ${D_{(s)}^{+}\to K_{S}^{0}K^{-}\pi^{+}\pi^{+}}$ decays. We use a combined data set from the Belle and Belle II experiments, which study $e^+e^-$ collisions at a center-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. The total integrated luminosity is 1407~fb$^{-1}$. We measure six $C\!P$-violating asymmetries that are based on triple-products and quadruple products of the momenta of final-state particles. Such asymmetries are sensitive to $C\!P$ violation due to interference among different partial-wave contributions to the decay amplitudes. We obtain a precision reaching 0.5\% for $\Dp\to\KS\Km\pip\pip$ decays and 0.2\% for $\Dsp\to\KS\Km\pip\pip$ decays. No evidence of $C\!P$ violation is found. Our results for the triple-product asymmetries are the most precise to date for singly-Cabibbo-suppressed $D^+$ decays; our results for the quadruple-product asymmetries are the first such measurements performed for charm decays.
ArXiv https://arxiv.org/abs/2409.15777
Inspire https://inspirehep.net/literature/2832416
DOI 10.1007/JHEP04(2025)036
Reference JHEP 04, 036 (2025)
Bibtex 
@article{Belle:2024ymt,
    author = "Aggarwal, L. and others",
    collaboration = "Belle, Belle-II",
    title = "{Search for CP violation in $ {D}_{(s)}^{+}\to {K}_S^0{K}^{-}{\pi}^{+}{\pi}^{+} $ decays using triple and quadruple products}",
    eprint = "2409.15777",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2024-025, KEK Preprint 2024-24, UCHEP-24-05",
    doi = "10.1007/JHEP04(2025)036",
    journal = "JHEP",
    volume = "04",
    pages = "036",
    year = "2025"
}

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