We present a measurement of time-dependent rate asymmetries in B0→φKS0 decays to search for non-standard-model physics in b→qq¯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 (387±6)×106 bottom-antibottom mesons from ϒ(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→cc¯s transitions.
Measurement of 𝐶𝑃 asymmetries in 𝐵0 →𝜙𝐾0𝑠 decays with Belle II
Bianchi, F.;Das, S.;Destefanis, M.;Maggiora, M.;Marcello, S.;Spataro, S.;
2023-01-01
Abstract
We present a measurement of time-dependent rate asymmetries in B0→φKS0 decays to search for non-standard-model physics in b→qq¯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 (387±6)×106 bottom-antibottom mesons from ϒ(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→cc¯s transitions.| File | Dimensione | Formato | |
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PhysRevD.108.072012.pdf
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