We present an improved measurement of the standard model CP violation parameter sin2phi_1 (also known as sin2beta) based on a sample of 85 times 10^6 B Bbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/psi K_S, psi(2S) K_S, chi_{c1} K_S, eta_c K_S, J/psi K^{*0}, or J/psi K_L CP-eigenstate decay channel and the flavor of accompanying B meson is identified from itsdecay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain sin2phi_1 = 0.719 +/- 0.074(stat) +/- 0.035(syst). We also report measurements of CP violation parameters for the related B^0 -> J/psi pi^0 decay mode and the penguin-dominated processes B^0 -> eta' K_S, phi K_S and K^+K^- K_S.

B meson

CP violation

10.48550/arxiv.hep-ex/0207098

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Time-dependent CP asymmetries in B0-->Ks0pi0gamma transitions

Physical Review D (2006)

Y. Ushiroda K. Sumisawa K. Abe I. Adachi H. Aihara

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Citations (34)

Observation of the decay (B)over-bar(0) -> D-s(+) Lambda (p)over-bar

T. Medvedeva R. Chistov Kentaro Abe I. Adachi H. Aihara

Bar (unit)

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Studies of B0 ---> rho+- pi-+ and evidence of B0 ----> rho0 pi0

Contributed to (2003)

Kazuo Abe Y. Chao S. Kobayashi D. Žontar D. Liventsev

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Measurement of branching fractions for two-body B meson decays with charmonium at Belle

Kazuo Abe Y. Chao S. Kobayashi S. Yanaka Katsuhide Misono

Branching (polymer chemistry)

B meson

Branching fraction

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Measurements of time-dependentCPviolation inB0→ωKS0,<…

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2007)

Y. Chao K. F. Chen H. Miyake O. Tajima K. Trabelsi

We present measurements of time-dependent CP asymmetries in $B^0 \to \omega K_S^0$, $f_0 (980) K_S^0$, $K_S^0 \pi^0$ and $K^+ K^- K_S^0$ based on a sample of 535 $\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. One neutral $B$ meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying $B$ meson is identified from its decay products. CP-violation parameters for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays.

10.1103/physrevd.76.091103

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Citations (25)

Studies of CP violation in B0 ---> J / psi K*0 decays

Contributed to (2004)

Kazuo Abe Heyoung Yang Y. Chao D. Žontar D. Liventsev

CP violation

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Citations (2)