首页|Measurement of $CP$ asymmetries in $B^0\to\eta'K^0_s$ decays at Belle II
Measurement of $CP$ asymmetries in $B^0\to\eta'K^0_s$ decays at Belle II
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Arxiv
We describe a measurement of charge-parity ($CP$) violation asymmetries in
$B^0\to\eta'K^0_S$ decays using Belle II data. We consider
$\eta'\to\eta(\to\gamma\gamma)\pi^+\pi^-$ and
$\eta'\to\rho(\to\pi^+\pi^-)\gamma$ decays. The data were collected at the
SuperKEKB asymmetric-energy $e^+e^-$ collider between the years 2019 and 2022,
and contain $(387\pm 6) \times 10^6$ bottom-antibottom meson pairs. We
reconstruct $829\pm35$ 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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Arxiv
