Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle II Collaborations, :, L. Aggarwal, H. Ahmed
| Summary:
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
center-of-mass energies at or near the $Upsilon(4S)$ resonance. We use 980
fb$^{-1}$ of data from Belle and 428 fb$^{-1}$ of data from Belle~II. We
measure six $C!P$-violating asymmetries that are based on triple products and
quadruple products of the momenta of final-state particles, and also the
particles’ helicity angles. We obtain a precision at the level of 0.5% for
$D^+to{}K_{S}^{0}K^{-}pi^{+}pi^{+}$ decays, and better than 0.3% for
$D^+_{s}to{}K_{S}^{0}K^{-}pi^{+}pi^{+}$ 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
other asymmetries are the first such measurements performed for charm decays.
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