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 𝐶⁢𝑃 asymmetries in 𝐵0 →𝜙⁢𝐾0𝑠 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.
2023
108
7
072012-1
072012-10
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.072012
Cabibbo–Kobayashi–Maskawa matrix, Bottom quark, CP violation, Particle data analysis
Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2069037
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