Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle

Abstract

We describe a flavor tagging algorithm used in measurements of the CP violation parameter sin2phi_1 at the Belle experiment. Efficiencies and wrong tag fractions are evaluated using flavor-specific B meson decays into hadronic and semileptonic modes. We achieve a total effective efficiency of $ 28.8 +- 0.6 %.

28 pages, 9 figures

References in corpus (1)

• Observation of Large CP Violation and Evidence for Direct CP Violation in B0-->pi+pi- Decays

Cited by in corpus (87)

• The Physics of the B Factories
• Test of lepton flavor universality and search for lepton flavor violation in $B\to K\ell \ell$ decays
• 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
• Measurement of Polarization and Triple-Product Correlations in B -> phi K^* Decays
• Precise measurement of the CP violation parameter sin2phi_1 in B0-->(c\bar c)K0 decays
• Improved Measurement of CP-Violation Parameters sin(2phi1) and |lambda|, B Meson Lifetimes, and B0-B0bar Mixing Parameter Delta m_d
• Time-Dependent CP-Violating Asymmetries in b -> s qbar q Transitions
• Measurement of EPR-type flavour entanglement in Upsilon(4S)->B0 B0bar decays
• Measurement of the $\bar{B}\to X_s\gamma$ Branching Fraction with a Sum of Exclusive Decays
• Observation of Direct CP-Violation in B0 --> pi+pi- Decays and Model-Independent Constraints on phi2
• Time-Dependent CP Asymmetries in B0 -> Ks pi0 gamma transitions
• Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-
• Measurement of the branching fraction, polarization, and CP asymmetry for B0->rho+rho- decays, and determination of the CKM phase phi_2
• Measurement of CP violating asymmetries in B^0 -> K^+K^- K^0_S decays with a time-dependent Dalitz approach
• Observation of b --> d gamma and Determination of |V_td/V_ts|
• Measurements of Branching Fractions and Polarization in B > K^* rho Decays
• Observation of B0->pi0pi0
• Evidence for Isospin Violation and Measurement of $CP$ Asymmetries in $B\to K^{\ast }(892)\gamma$
• Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays
• Evidence for CP Violation in B0 -> D+D- Decays
• Measurement of the CKM parameter cos(2phi_1) using time-dependent Dalitz analysis of B0bar -> D[Ks pi+ pi-] h0
• CP violation in the B system
• Measurement of $\cos 2\beta$ in $B^0\to D^{(\ast )}{h}^0$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data
• A Method to Measure ${\varphi }_1$ Using ${\bar{B}}^0\to D{h}^0$ With Multibody $D$ Decay
• Observation of B Decays to Two Kaons
• Measurement of CP Asymmetries and Branching Fractions in a Time-Dependent Dalitz Analysis of B^0-->(rho pi)^0 and a Constraint on the Quark Mixing Angle phi_2
• Improved measurement of CP-violating parameters in rho+rho- decays
• Study of B0 -> rho+-pi-+ Time-dependent CP Violation at Belle
• Improved measurements of branching fractions for B -> K pi and B -> pi pi decays
• Evidence for B-> eta' pi and improved measurements for B-> eta' K
• Measurements of time-dependent CP violation in $B^0\to \omega K_S^0$, $f_0(980)K_S^0$, $K_S^0{\pi }^0$ and $K^{+}{K}^{-}{K}_S^0$ decays
• Measurement of Time-Dependent CP-Violating Asymmetries in $B_0\to K_s{K}_s{K}_s$ Decay
• Study of B^0 -> rho^0 rho^0 decays, implications for the CKM angle phi_2 and search for other B^0 decay modes with a four-pion final state
• Measurement of branching fraction and direct $CP$ asymmetry in charmless $B^{+}\to K^{+}{K}^{-}{\pi }^{+}$ decays at Belle
• Improved Evidence for Direct CP Violation in B0 --> pi+ pi- Decays and Model-Independent Constraints on phi_2
• Measurement of Branching Fractions and CP Asymmetries in B -> wK Decays and First Evidence of CP Violation in B0 -> wKS0
• Search for $B^0\to K^{\ast 0}\overline{K}{}^{\ast 0}$, $B^0\to K^{\ast 0}{K}^{\ast 0}$ and $B^0\to K^{+}{\pi }^{-}{K}^{\mp }{\pi }^{\pm }$ Decays
• Study of ${\mathbf{B}}^0\to {\rho }^{+}{\rho }^{-}$ decays and implications for the CKM angle ${\varphi }_2$
• Improved measurement of time-dependent CP violation in B0 -> J/Psi pi0 decays
• Improved Measurements of Partial Rate Asymmetry in B -> h h Decays
• Measurement of Time-dependent $CP$ Asymmetries in $B^0\to K_S^0\eta \gamma$ Decays
• Measurement of Branching Fraction and Time-Dependent CP Asymmetry Parameters in B0 -> D*+ D*- Ks Decays
• Measurements of Branching Fractions and CP Asymmetries in B-> etah Decays
• Search for $B^0\to p\bar{p}$, $\Lambda \bar{\Lambda }$ and $B^{+}\to p\bar{\Lambda }$ at Belle
• Measurements of Branching Fractions and Time-dependent CP Violating Asymmetries in $B^0\to D^{(\ast )\pm }{D}^{\mp }$ Decays
• Measurement of Branching Fraction and First Evidence of CP Violation in B0 --> a1+-(1260) pi-+ Decays
• Search for the decay $B^0\to D{K}^{\ast 0}$ followed by $D\to K^{-}{\pi }^{+}$
• Evidence for the suppressed decay B^- -> DK^-, D -> K^+π^-π^0
• Evidence for the decay B0 --> K+K-pi0
• Time-Dependent {\boldmath $CP$}-Violating Asymmetry in $B^0\to {\rho }^0\gamma$ Decays
• Measurement of Time-Dependent CP-Violating Asymmetry in B0 -> Ks pi0 gamma Decay
• New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2{\varphi }_1$ in $B^0\to J/\psi K_{\text{S}}^0$ decays
• Search for B decays into eta' rho, eta' K*, eta' phi, eta' omega and eta' eta(') at Belle
• Measurement of charmless $B$ Decays to $\eta K^{\ast }$ and $\eta \rho$
• Improved Measurements of Branching Fractions and CP Asymmetries in B-> eta h Decays
• Search for Resonant $B^{\pm }\to K^{\pm }h\to K^{\pm }\gamma \gamma$ Decays at Belle
• First evidence for $\cos 2\beta >0$ and resolution of the CKM Unitarity Triangle ambiguity by a time-dependent Dalitz plot analysis of $B^0\to D^{(\ast )}{h}^0$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays
• First measurement of the CKM angle ${\varphi }_3$ with $B^{\pm }\to D(K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}{\pi }^0)K^{\pm }$ decays
• Measurement of Time-Dependent $CP$ Violation in $B^0\to {\eta }^{\prime }{K}^0$ Decays
• Measurement of the CKM angle ${\phi }_1$ in $B^0\to \bar{D}{}^{(\ast )0}{h}^0$, $\bar{D}{}^0\to K_S^0{\pi }^{+}{\pi }^{-}$ decays with time-dependent binned Dalitz plot analysis
• Search for B -> phi pi decays
• First Observation of Radiative B^0 -> ϕK^0 γDecays and Measurements of Their Time-Dependent CP Violation
• Search for the decay B0 -> phi gamma
• Search for the lepton-flavor-violating decay $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$
• Measurement of the branching fraction and time-dependent $CP$ asymmetry for $B^0\to J/\psi {\pi }^0$ decays
• Measurement of the branching fraction and $CP$ asymmetry in $B^0\to {\pi }^0{\pi }^0$ decays, and an improved constraint on ${\varphi }_2$
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• Measurements of B Decays to Two Kaons
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• Evidence for B to K eta' gamma Decays at Belle
• First Measurement of Inclusive B -> X_s eta Decays
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• First observation of CP violation and improved measurement of the branching fraction and polarization of B0 -> D*+ D*- decays
• Observation of $B^{+}\to p\bar{\Lambda }{K}^{+}{K}^{-}$ and $B^{+}\to \bar{p}\Lambda K^{+}{K}^{+}$
• Evidence for the decay $B^0\to p\bar{p}{\pi }^0$
• Search for $B^0\to X(3872)\gamma$
• Search for the b --> d gamma process
• Study of $B\to p\bar{p}\pi \pi$
• Measurement of the branching fraction and $CP$ asymmetry for $B\to {\bar{D}}^0\pi$ decays
• Weak Value Amplification in High Energy Physics: A Case Study for Precision Measurement of CP Violation in B Meson Decays
• Angular analysis of the low $K^{+}{K}^{-}$ invariant mass enhancement in $B^{+}\to K^{+}{K}^{-}{\pi }^{+}$ decays
• First measurement of the $B^{+}\to {\pi }^{+}{\pi }^0{\pi }^0$ branching fraction and \textit{CP} asymmetry
• $B$-flavor tagging at Belle II
• Search for $B^0\to K_S^0{K}_S^0\gamma$ decays at Belle
• Combined analysis of Belle and Belle II data to determine the CKM angle ${\varphi }_3$ using $B^{+}\to D(K_S^0{h}^{-}{h}^{+})h^{+}$ decays
• Search for the CP-violating decays ${\rm Y}(4S)B0\bar{B}0J/K{0}_S+J/\psi ({\eta }_c)K{0}_S$