Observation of Large CP Violation in the Neutral B Meson System

Abstract

We present a measurement of the Standard Model CP violation parameter sin 2phi_1 based on a 29.1 fb^{-1} data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/psi Ks, psi(2S) Ks, chi_c1 Ks, eta_c Ks, J/psi K_L or J/psi K^{*0} decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin 2phi_1 = 0.99 +- 0.14(stat) +- 0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

4 figures, to appear in Phys. Rev. Letters

References in corpus (4)

• Observation of CP violation in the B^0 meson system
• Measurement of CP-violating asymmetries in B0 decays to CP eigenstates
• Measurement of the CP Violation Parameter sin(2phi_1) in B^0_d Meson Decays
• Study of the CP asymmetry of B0 -> J/psi K0S decays in ALEPH

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• A realistic formulation of approximate CP
• Direct CP Violation and Isospin Triangles of B->ππDecays
• Search for $CP$ violation in ${\Xi }_c^{+}\to {\Sigma }^{+}{h}^{+}{h}^{-}$ and ${\Lambda }_c^{+}\to p{h}^{+}{h}^{-}$ at Belle II
• Observability of`Cascade Mixing' in B0 --> J/psi K0
• Search for the Electric Dipole Moment of the tau lepton
• Predictions for the unitarity triangle angles in a new parametrization
• CP violation in scattering of neutrinos on polarized proton target
• Theory Motivation: What measurements are needed?
• Sensitivity of $CP$ Violation of $\Lambda$ decay in $J/\psi \to \Lambda \bar{\Lambda }$ at STCF
• Observation of CP violation in charm decays at LHCb
• General analysis of time evolution of decay spectrum in B^0 -> pi^+ pi^- l^+ l^-
• Unlocking time-dependent $CP$ violation without signal vertexing at $B$ factories
• Measurement of CP Violation in $D^0/{\bar{D}}^0$
• What We've Learned from Heavy Flavour Experiments Since CKM2010
• Flavour Physics at LHCb -- 50 years of the KM paradigm
• A vertex-structure model for new direct CP-violating effects in Bbar^0(B^0) -> phi K_S and in B^-+ -> pi^-+ eta' (eta)
• Probing CKM parameters through unitarity, ε_K and Δm_{B_{d,s}}
• Theoretical correction to the neutral $B^0$ meson asymmetry
• Recoil electron polarization-dependent T-odd correlations in neutrino elastic scattering on polarized electron target
• CP violation in neutrino-photon scattering
• Rare Decays at B Factories
• New Physics in CP-Violating Observables for Beauty
• Recent Belle results on CP violation
• Highlights from Five Years at the B Factories
• Observability of 2HDM Neutral Higgs Bosons in fully hadronic decay at future linear collider
• Measurement of CP violation in Bs --> J/psi phi decay
• Non-leptonic B-decays, CP violation & the UT
• Search for the CP-violating decays ${\rm Y}(4S)B0\bar{B}0J/K{0}_S+J/\psi ({\eta }_c)K{0}_S$
• Observation of $CP$ violation in $B^0\to J/\psi \rho (770{)}^0$ decays
• Phenomenological analysis of charmless $B\to PV$ decays in the modified perturbative QCD approach
• Status and Prospects of Discrete Symmetries Tests in Positronium Decays with the J-PET Detector
• Precise Measurement of Chromoelectric Dipole Moment of the Charm Quark
• Symmetry violations at BaBar
• Right-handed chirality of muon neutrinos in polarized muon decay at rest
• Measurement of CP asymmetries in $D^0\to hh$ decays
• Results of time evolution analyses of B-decays at Belle