Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara
| Summary:
We describe a measurement of charge-parity ($CP$) violation asymmetries in
$B^0toeta’K^0_S$ decays using Belle II data. We consider
$eta’toeta(togammagamma)pi^+pi^-$ and
$eta’torho(topi^+pi^-)gamma$ decays. The data were collected at the
SuperKEKB asymmetric-energy $e^+e^-$ collider between the years 2019 and 2022,
and contain $(387pm 6) times 10^6$ bottom-antibottom meson pairs. We
reconstruct $829pm35$ signal decays and extract the $CP$ violating parameters
from a fit to the distribution of the proper-decay-time difference between the
two $B$ mesons. The measured direct and mixing-induced $CP$ asymmetries are
$text{C}_{eta’K^0_S} = -0.19 pm 0.08 pm 0.03 $ and $text{S}_{eta’K^0_S} =
+0.67 pm 0.10 pm 0.04 $, respectively, where the first uncertainties are
statistical and the second are systematic. These results are in agreement with
current world averages and standard model predictions.
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