Measurement of the CP-Violating Asymmetry Amplitude sin2beta

Abstract

We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.034 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.030 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes.

7 pages, 2 postscript figures, submitted to PRL

Cited by in corpus (177)

• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• The Physics of the B Factories
• Physics at Super B Factory
• An inclusive measurement of the photon energy spectrum in b->s gamma decays
• Direct CP Violating Asymmetry in B0 -> K+pi- Decays
• B Meson Semileptonic Form Factors from Unquenched Lattice QCD
• Effects of mixing with quark singlets
• Present Status of Inclusive Rare B Decays
• Evidence for B0->pi0pi0
• Evidence for Direct CP Violation in B0 -> K+- pi-+ Decays
• Impact of tag-side interference on time-dependent CP asymmetry measurements using coherent B0 B0bar pairs
• Four-Zero Texture of Hermitian Quark Mass Matrices and Current Experimental Tests
• SU(3) Relations and the CP Asymmetries in B Decays to ${\eta }^{\prime }{K}_S$, $\varphi K_S$ and $K^{+}{K}^{-}{K}_S$
• Improved Measurement of CP Asymmetries in B0 -> (ccbar)K0(*) Decays
• Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu
• Ambiguity-Free Measurement of cos2beta: Time-Integrated and Time-Dependent Angular Analyses of B->J/Psi K pi
• B-Bbar mixing in unquenched lattice QCD
• Measurement of the Cabibbo-Kobayashi-Maskawa angle gamma in B-+ -> D(*)K-+ decays with a Dalitz analysis of D -> K0s pi- pi+
• Measurement of Time-Dependent CP-Violating Asymmetries in B0 --> phi Ks0, K+ K- Ks0, and eta' Ks0 Decays
• Role of Charm Factory in Extracting CKM-Phase Information via B --> DK
• Improved Measurement of CP-Violation Parameters sin(2phi1) and |lambda|, B Meson Lifetimes, and B0-B0bar Mixing Parameter Delta m_d
• On supersymmetric contributions to the CP asymmetry of the B -> phi K_S
• Experiments in Fundamental Neutron Physics
• MSLED: A Minimal Supersymmetric Large Extra Dimensions Scenario
• Time-Dependent CP-Violating Asymmetries in b -> s qbar q Transitions
• Observation of CP violation in B^0 -> eta' K^0 Decays
• Study of B meson decays to three-body charmless hadronic final states
• A Study of B0 to rho+rho- Decays and Constraints on the CKM Angle alpha
• A Possibility of large electro-weak penguin contribution in B -> K pi modes
• Large electroweak penguin contribution in B -> K pi and pi pi decay modes
• Two-Body Charmless B Decays Involving eta and eta'
• Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|
• Measurements of Branching Fractions and CP-Violating Asymmetries in B0 -> rho+- h-+ Decays
• Observation of B+ -> psi(3770) K+
• A possible supersymmetric solution to the discrepancy between B -> ϕK_S and B -> η' K_S CP asymmetries
• Amplitude Analysis of the Decay B+- -> pi+- pi+- pi-+
• Measurement of CP violating asymmetries in B^0 -> K^+K^- K^0_S decays with a time-dependent Dalitz approach
• Study of the decay B0(B0bar)-->rho+rho-, and constraints on the CKM angle alpha
• Observation of the Decay B+ --> K+K-pi+
• Moduli Stabilisation and Applications in IIB String Theory
• Evidence for CP-Violating Asymmetries in B0->pi+pi- Decays and Constraints on the CKM Angle phi2
• Measurements of Branching Fractions and Time-Dependent CP-Violating Asymmetries in B to eta' K Decays
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Improved Measurements of Branching Fractions for B->Kpi, pipi and KK Decays
• Observation of B0->pi0pi0
• Limits on the Decay-Rate Difference of Neutral-B Mesons and on CP, T, and CPT Violation in B0-antiB0 Oscillations
• Branching Fractions and CP Asymmetries in B0 -> pi0pi0, B+ -> pi+pi0 and B+ -> K+pi0 Decays and Isospin Analysis of the B -> pipi System
• Correlated bounds on CP asymmetries in $B^0\to {\eta }^{\prime }{K}_S$
• Charmless two-body B decays: A global analysis with QCD factorization
• Measurement of time dependent CP asymmetry parameters in B0 meson decays to omega K0S, eta'K0, and pi0K0S
• CP violation in $B\to \varphi K_S$ decay at large $\tan \beta$
• Time-dependent Dalitz Plot Measurement of CP Parameters in B0 --> Ks Pi+ Pi- Decays
• Measurement of Time-Dependent CP-Violating Asymmetries and Constraints on sin(2 beta+gamma) with Partial Reconstruction of B->D*-+pi+- Decays
• Measurements of CP-violating Asymmetries and Branching Fractions in B Meson Decays to eta' K
• Time-Dependent CP Violation in $B^0\to P^0{P}^0{X}^0$ Decays
• B_s^0 - bar{B}_s^0 Mixing and the B_s -> J/psi phi Asymmetry in Supersymmetric Models
• Right handed currents and FSI phases in B^0 --> ϕK^{*0}
• Measurement of CP-Violating Asymmetries in B0->D(*)+D-
• Maximal CP Violation Hypothesis and Phase Convention of the CKM Matrix
• Interpreting the time-dependent CP asymmetry in $B^0\to {\pi }^0{K}_S$
• Direct CP violation in $B^{\pm }\to p\bar{p}{K}^{(\ast )\pm }$
• CP asymmetries in $B\to \varphi K_S$ and $B\to {\eta }^{\prime }{K}_S$ in MSSM
• New physics effects on the CP asymmetries in B -> phi K_S and B -> eta' K_S decays
• Simultaneous solution to B --> phi K CP Asymmetry and B --> eta(prime) K, eta K^* branching ratio anomalies from R-parity violation
• Search for eta_c decays into pi pi and K Bar K
• Using untagged B^0 -> D K_S to determine gamma
• Observation of the Decay $B^0\to {\pi }^0{\pi }^0$
• Chargino contributions to the CP asymmetry in B -> Phi K(S) decay
• The CKM Matrix and The Unitarity Triangle: Another Look
• Wolfenstein-like Parametrization of the Neutrino Mixing Matrix
• Limits on the Decay-Rate Difference of Neutral B Mesons and on CP, T, and CPT Violation in B0-B0bar Oscillations
• Observation of B0 -> K*0 K*0bar and search for B0 -> K*0 K*0
• Study of Time-Dependent CP-Violating Asymmetries in b->sq q Decays
• Comparative Study of CP Asymmetries in Supersymmetric Models
• Implications of CP Asymmetries in $B\to {\pi }^{+}{\pi }^{-}$
• B to rho ell nu form factors in lattice QCD
• Measurement of the Direct CP Asymmetry in b -> s gamma Decays
• Evidence for CP violation in B0->J/Psi pi0 decays
• Exploring flavor structure of supersymmetry breaking from rare B decays and unitarity triangle
• Observation of the Decay $B^{\pm }\to {\pi }^{\pm }{\pi }^0$, Study of $B^{\pm }\to K^{\pm }{\pi }^0$, and Search for $B^0\to {\pi }^0{\pi }^0$
• Branching Fraction Measurements of B+ -> rho+ gamma, B0 -> rho0 gamma, and B0 -> omega gamma
• On measuring alpha in B(t)-> rho^\pm pi^\mp
• Study of B0 -> rho+-pi-+ Time-dependent CP Violation at Belle
• Observation of B0bar --> D0 K0bar and B0bar --> D0 K*0bar decays
• Search for b->u transitions in B- -> D0 K- and B- -> D*0 K-
• Gold-plated Mode of CP-Violation in Decays of B_c Meson from QCD Sum Rules
• Observation of B Meson Decays to omegaK* and Improved Measurements for omegarho and omega f_0
• Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay
• Measurement of the Branching Fraction and Time-Dependent CP Asymmetry in the Decay B0->D*+D*-Ks
• Measurement of Time-Dependent CP-Violating Asymmetries in $B_0\to K_s{K}_s{K}_s$ Decay
• Limit on the B0->rho0rho0 Branching Fraction and Implications for the CKM Angle alpha
• Measurement of the Branching Fraction and the CP-Violating Asymmetry for the Decay B0 --> K0S Pi0
• Measurements of CP-violating Asymmetries in $B^0\to K_s^0{\pi }^0$ Decays
• Measurement of Branching Fraction and CP Asymmetry in B+ ->rho+ pi0
• T--odd correlations in (B -> K* l^+ l^-) decay beyond standard model
• CP Asymmetries of $B\to \varphi K$ and $B\to {\eta }^{(\prime )}K$ Decays Using a Global Fit in QCD Factorization
• Soft CP violation in K-meson systems
• Improved Measurements of Partial Rate Asymmetry in B -> h h Decays
• The Matrix of Unitarity Triangle Angles for Quarks
• Chargino Contributions in $B\to \varphi K_S$ Asymmetry
• Measurement of Branching Fraction and Time-Dependent CP Asymmetry Parameters in B0 -> D*+ D*- Ks Decays
• Branching Fractions and CP Asymmetries in B0 --> K+ K- K0S and B+ --> K+ K0S K0S
• Difference of \tilde εand εin fitting the parameters of CKM matrix
• Measurement of the Branching Fraction and CP-violating Asymmetries in Neutral B Decays to D*+-D-+
• A Measurement of CP Asymmetry in b->sgamma using a Sum of Exclusive Final States
• Branching Fraction, Polarization and CP-Violating Asymmetries in B0 -> D*+ D*- Decays
• Branching Fraction Measurements of B ->etac K Decays
• Measurement of Time-Dependent CP Asymmetry in B0->D^(*)+-pi-+ Decays and Constraints on |sin(2beta+gamma)|
• B^0_{d,s} - \bar{B}^0_{d,s} mixing in the model III 2HDM
• Solving the SUSY CP problem with flavor breaking F-terms
• Shape of the Unitary Triangle and Phase Conventions of the CKM Matrix
• Measurement of Time-Dependent CP Asymmetries and Constraints on sin(2beta+gamma) with Partial Reconstruction of B0 -> D*-+ pi+- Decays
• Searching for new physics in the angular distribution of B^0 -> phi K^* decay
• A New Concept for Searching for Time-Reversal Symmetry Violation Using Pa-229 Ions Trapped in Optical Crystals
• Measurements of Branching Fractions and CP-Violating Asymmetries in B Meson Decays to Charmless Two-Body States Containing a K0
• Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay B0 --> D*+D*-
• Pathways to a clean gamma (phi3): From B to Super B-factories
• Tying in CP and Flavor Violations with Fermion Masses and Neutrino Oscillations
• Analysis of Supersymmetric Effects on B -> phi K Decays in the PQCD Approach
• Measurement of the Branching Fraction and Polarization for the Decay B- to D*0 K*-
• Search for the decay B+ -> Kbar*0(892) K+
• Search for the Radiative Penguin Decays B+ -> rho+ gamma, B0 -> rho0 gamma, and B0 -> omega gamma
• Some exact results on CP and CPT violations in a $C=-1$ entangled pseudoscalar neutral meson pair
• Searching for dominant rescattering sources in B to two pseudoscalar decays
• Study of Time-Dependent CP Asymmetry in Neutral B Decays to J/psi pi0
• Observation of $B^0\to D^{+}{D}^{-}$, $B^{-}\to D^0{D}^{-}$ and $B^{-}\to D^0{D}^{\ast -}$ decays
• Majorana Neutrino Mixing
• Evidence for B0->rho0rho0 Decay and Implications for the CKM Angle alpha
• CKM matrix and CP violation in B-mesons
• Measurements of the Branching Fraction and Time-Dependent CP Asymmetries of B0 to J/Psi Pi0 decays
• Implications of Non-Standard CP Violation in Hadronic $B$-Decays
• Evidence for the Decay B+- --> K*+- pi0
• Improved Measurement of the Partial-Rate CP Asymmetry in B+ -> K0pi+ and B- -> K0bar pi- Decays
• Measurement of the Charge Asymmetry in $B\to K^{\ast }(892{)}^{\pm }{\pi }^{\mp }$
• Improved Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay B0->D*+D*-
• Large Supersymmetric Contribution to CP Asymmetry of B_d \to ϕK_S from Left-Handed Squark Mixing
• Large Direct CP Violation in B -> phi phi Xs Decays
• $B^0-{\bar{B}}^0$ mixing in supersymmetry with gauged baryon and lepton numbers
• The quark mixing matrix with manifest Cabibbo substructure and an angle of the unitarity triangle as one of its parameters
• CP and CPT Violating Parameters Determined from the Joint Decays of $C=+1$ Entangled Neutral Pseudoscalar Mesons
• Probing new physics in B -> phi pi decay
• CP asymmetry in B \to phi K_S in a SUSY SO(10) GUT
• Evidence of B0 --> rho0 pi0
• Measurement of Branching Fractions for $B\to {\chi }_{c1(2)}K(K^{\ast })$ at Belle
• Search for b--> u transitions in B- -> [K+pi-pi0]_D K-
• Search for B+/- --> [K-/+ pi+/-]_D K+/- and upper limit on the b --> u amplitude in B+/- --> D K+/-
• Novel two-loop SUSY effects on CP asymmetry in $B\to \varphi K_s$
• Search for B0 -> K*+ K*-
• The one loop contributions to c(t) electric dipole moment in the CP violating BLMSSM
• CP violation in B meson decays
• The neutron electric dipole moment experiment at the Spallation Neutron Source
• Measurement of the Ratio of Decay Amplitudes for B0bar -> J/psi K*0 and B0 -> J/psi K*0
• Survey of deformation in nuclei in order to estimate the enhancement of sensitivity to atomic EDM
• Triangular mass matrices for quarks and leptons
• Measurement of the branching fraction and decay rate asymmetry of B- --> D_{pi+pi-pi0}K-
• CP Test in J/Psi -> gamma phi phi Decay
• What can we learn from a measurement of sin(2 beta + gamma)?
• Search for B Meson Decays to eta' eta' K
• Time dependent CP asymmetry in $B^0\to {\rho }^0\gamma$ decay to probe the origin of CP violation
• What can we learn from phi_1 and B_d^0 -> pi^+ pi^- ?
• Bounds on gamma from CP violation measurements in B -> pi+ pi- and B -> psi K_S
• Measurement of sin2beta with Hadronic and Previously Unused Muonic J/psi Decays
• Measurement of the CP asymmetry in $D^{+}\to {\pi }^{+}{\pi }^0$ decays at Belle II
• Waiting for Clear Signals of New Physics in B and K Decays
• A new implication for strong interactions if large, direct CP violation in Bbar^0(B^0) -> pi^+pi^- is confirmed
• Measurement of $B\to X\gamma$ Decays and Determination of $|V_{td}/V_{ts}|$
• Fermion Masses and Mixing in Four and More Dimensions
• Possibility of Measuring the CP-Violation gamma-parameter in Decays of Xi_bc Baryons
• T violation in $B\to K\varphi \varphi$ decays
• Electric dipole moments from the perspective of a scalar triplet and singlet extension of the MSSM: A study of neutrons, electrons, mercury, and b and c quarks
• Unitarity triangle test of the extra factor of two in particle oscillation phases
• Exploring CP Violation through B Decays
• What Next in Flavour Physics and CP Violation?
• Selected Topics in CP Violation and Weak Decays from BABAR
• Phenomenology of charmless hadronic B decays
• Recent measurements of CP violation at the B factories
• Branching Fraction and CP Asymmetries of $B^0\to K_S^0{K}_S^0{K}_S^0$