Measurement of <i>CP</i> asymmetries in B<SUP>0</SUP> → φK<sub>s</sub><SUP>0</SUP> decays with Belle II
Description
We present a measurement of time-dependent rate asymmetries in B-0 -> phi K-s(0) decays to search for non-standard-model physics in b -> q (q) over bars transitions. The data sample is collected with the Belle II detector at the SuperKEKB asymmetric-energy e(+)e(-) collider in 2019-2022 and contains (387 +/- 6) x 10(6) bottomantibottom mesons from gamma(4S) resonance decays. We reconstruct 162 +/- 17 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 C = -0.31 +/- 0.20 +/- 0.05 and S = 0.54 +/- 0.26(-0.08)(+0.06), respectively, where the first uncertainties are statistical and the second are systematic. The results are compatible with the CP asymmetries observed in b -> c (c) over bars transitions.
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bib-384c4258-ddec-436a-aa83-c57255a0e1f2.txt
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