Measurement of time-dependent $CP$ asymmetries in ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}\ensuremath{\eta}\ensuremath{\gamma}$ decays

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Measurement of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} η γ$ decays

H. Nakano et al. (Belle Collaboration)

Phys. Rev. D 97, 092003 – Published 18 May 2018

Abstract

We report a measurement of time-dependent $C P$ violation parameters in $B^{0} \to K_{S}^{0} η γ$ decays. The study is based on a data sample, containing $772 \times 10^{6} B \bar{B}$ pairs, that was collected at the $ϒ (4 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We obtain the $C P$ violation parameters of $S = - 1.32 \pm 0.77 (stat) \pm 0.36 (syst)$ and $A = - 0.48 \pm 0.41 (stat) \pm 0.07 (syst)$ for the invariant mass of the $K_{S}^{0} η$ system up to $2.1 GeV / c^{2}$ .

Received 21 March 2018

DOI:https://doi.org/10.1103/PhysRevD.97.092003

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Published by the American Physical Society