Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed
| Summary:
We present a measurement of time-dependent rate asymmetries in $B^0to phi
K^0_S$ decays to search for non-standard-model physics in $bto q
overline{q}s$ transitions. The data sample is collected with the Belle II
detector at the SuperKEKB asymmetric-energy $e^{+}e^{-}$ collider in 2019-2022
and contains $(387pm 6)times 10^6$ bottom-antibottom mesons from
$Upsilon(4S)$ resonance decays. We reconstruct $162pm17$ signal events and
extract the charge-parity ($CP$) violating parameters from a fit to the
distribution of the proper-decay-time difference of the two $B$ mesons. The
measured direct and mixing-induced $CP$ asymmetries are $A=0.31pm0.20pm0.05$
and $S=0.54pm0.26^{+0.06}_{-0.08}$, respectively, where the first
uncertainties are statistical and the second are systematic. The results are
compatible with the $CP$ asymmetries observed in $bto coverline{c} s$
transitions.
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