We present a measurement of time-dependent rate asymmetries in B0→ϕK0S decays to search for non-standard-model physics in b→q¯qs 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+0.06−0.08, respectively, where the first uncertainties are statistical and the second are systematic. The results are compatible with the CP asymmetries observed in b→c¯cs transitions.

Measurement of CP asymmetries in B0→ϕKs0 decays with Belle II / 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., Aversano, M., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw., Barrett, M., Baudot, J., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108/2023:7(2023), pp. 072012."-"-072012."-". [10.1103/PhysRevD.108.072012]

Measurement of CP asymmetries in B0→ϕKs0 decays with Belle II

Gabrielli, A.;Ganiev, E.;Ghosh, D.;Johnson, A.;Lanceri, L.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2023-01-01

Abstract

We present a measurement of time-dependent rate asymmetries in B0→ϕK0S decays to search for non-standard-model physics in b→q¯qs 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+0.06−0.08, respectively, where the first uncertainties are statistical and the second are systematic. The results are compatible with the CP asymmetries observed in b→c¯cs transitions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3068419
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