Measurement of Branching Fractions and CP Asymmetries in B -> wK Decays and First Evidence of CP Violation in B0 -> wKS0

Abstract

We present a measurement of the branching fractions and charge-parity-(CP-) violating parameters in B -> omega K decays. The results are obtained from the final data sample containing 772 x 10^(6) BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(B0 -> omega K0) = (4.5 +/- 0.4 (stat) +/- 0.3 (syst)) x 10^(-6), B(B- -> omega K-) = (6.8 +/- 0.4 (stat) +/- 0.4 (syst)) x 10^(-6), which are in agreement with their respective current world averages. For the CP violating parameters, we obtain A(B0 -> omega KS) = -0.36 +/- 0.19 (stat) +/- 0.05 (syst), S(B0 -> omega KS) = +0.91 +/- 0.32 (stat) +/- 0.05 (syst), A(B- -> omega K-) = -0.03 +/- 0.04 (stat) +/- 0.01 syst), where A and S represent the direct and mixing-induced CP asymmetry, respectively. We find no evidence of CP violation in the decay channel B-->omega K-; however, we obtain the first evidence of CP violation in the B0 -> omega KS decay channel at the level of 3.1 standard deviations.

25 pages, 5 figures, Submitted to PRD

References in corpus (10)

• Observation of Time-Dependent CP Violation in B0 -> eta' K0 Decays and Improved Measurements of CP Asymmetries in B0 -> phiK0, KsKsKs and B0 -> J/psi K0 Decays
• Study of CP violation in Dalitz-plot analyses of B0 --> K+K-KS, B+ --> K+K-K+, and B+ --> KSKSK+
• Precise measurement of the CP violation parameter sin2phi_1 in B0-->(c\bar c)K0 decays
• Penguin-dominated B -> PV decays in NLO perturbative QCD
• Charmless Two-body $B(B_s)\to VP$ decays In Soft-Collinear-Effective-Theory
• Measurement of CP violating asymmetries in B^0 -> K^+K^- K^0_S decays with a time-dependent Dalitz approach
• Amplitude analysis and measurement of the time-dependent CP asymmetry of $B^0\to K_0^S{K}_0^S{K}_0^S$ decays
• $B\to {\eta }^{(\prime )}({\ell }^{-}{\bar{\nu }}_{\ell },{\ell }^{+}{\ell }^{-},K,K^{\ast })$ decays in the quark-flavor mixing scheme
• Determination of gamma from Charmless B --> M1 M2 Decays Using U-Spin
• Search for CP violating charge asymmetry in B^+ -> J/psi K^+ decays

Cited by in corpus (12)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• New constraints on light vectors coupled to anomalous currents
• Dark forces coupled to non-conserved currents
• Coupling QCD-scale axion-like particles to gluons
• Updating B --> PP, VP decays in the framework of flavor symmetry
• Heavy QCD Axion in $b\to s$ transition: Enhanced Limits and Projections
• Heavy QCD Axion at Belle II: Displaced and Prompt Signals
• Energetic long-lived particles in the CMS muon chambers
• $\rho -\omega$ mixing contribution to the measured $CP$ asymmetry of $B^{\pm }\to \omega K^{\pm }$