We report a measurement of the CP-violating parameters C and S in B^{0}→K_{S}^{0}π^{0} decays at Belle II using a sample of 387×10^{6}  BB[over ¯] events recorded in e^{+}e^{-} collisions at a center-of-mass energy corresponding to the ϒ(4S) resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain C=-0.04_{-0.15}^{+0.14}±0.05 and S=0.75_{-0.23}^{+0.20}±0.04, where the first uncertainties are statistical and the second are systematic.

Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of CP Violation in B^{0}→K_{S}^{0}π^{0} Decays at Belle II. PHYSICAL REVIEW LETTERS, 131(11), 111803-1-111803-8 [10.1103/PhysRevLett.131.111803].

Measurement of CP Violation in B^{0}→K_{S}^{0}π^{0} Decays at Belle II

Branchini, P
Membro del Collaboration Group
;
Budano, A
Membro del Collaboration Group
;
Bussino, S
Membro del Collaboration Group
;
De Pietro, G
Membro del Collaboration Group
;
Laurenza, M
Membro del Collaboration Group
;
Martellini, C
Membro del Collaboration Group
;
Prencipe, E;
2023-01-01

Abstract

We report a measurement of the CP-violating parameters C and S in B^{0}→K_{S}^{0}π^{0} decays at Belle II using a sample of 387×10^{6}  BB[over ¯] events recorded in e^{+}e^{-} collisions at a center-of-mass energy corresponding to the ϒ(4S) resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain C=-0.04_{-0.15}^{+0.14}±0.05 and S=0.75_{-0.23}^{+0.20}±0.04, where the first uncertainties are statistical and the second are systematic.
2023
Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of CP Violation in B^{0}→K_{S}^{0}π^{0} Decays at Belle II. PHYSICAL REVIEW LETTERS, 131(11), 111803-1-111803-8 [10.1103/PhysRevLett.131.111803].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/462098
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