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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Citations (10)

Dynamic range improvement by narrow-channel effect suppression and smear reduction technologies in small pixel IT-CCD image sensors

IEEE Transactions on Electron Devices (2000)

Akihito Tanabe Y. Kudoh Y. Kawakami I. Masubuchi S. Kawai

Technologies for narrow-channel effect suppression in photodiodes (PDs) and vertical CCDs (V-CCDs) and for smear reduction in PDs have been developed in order to improve dynamic range in small pixel interline-transfer CCD (IT-CCD) image sensors. The new technologies have been applied to a progressive-scan IT-CCD image sensor with 5 /spl mu/m square pixels and have (1) increased the charge handling capability of its V-CCDs to 4500 electrons/V; (2) improved its smear value to -95 dB; and (3) increased the saturation charge of its PDs to 2.3/spl times/10/sup 4/ electrons.

Photodiode

Charge-coupled device

Wide dynamic range

10.1109/16.861580

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Citations (8)

Search for charmless two-body baryonic decays ofBmesons

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (2002)

K. Abe K. Abe K. Abe I. Adachi Byoung Sup Ahn

We report the results of a search for the rare baryonic decays ${B}^{0}\ensuremath{\rightarrow}p\overline{p},$ $\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}},$ and ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}.$ The analysis is based on a data set of $31.7\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ events collected by the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. No statistically significant signals are found, and we set branching fraction upper limits $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}p\overline{p})<1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}})<1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ and $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}})<2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at the 90% confidence level.

KEKB

Branching fraction

10.1103/physrevd.65.091103

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Citations (29)

A Microprocessor for Speech Recognition

IEEE Journal on Selected Areas in Communications (1985)

Y. Kawakami H. Ishizuka Masao Watari Hiroaki Sakoe Tohru Hoshi

A new single-chip microprocessor for speech recognition, the SRP, has been developed, utilizing a multiprocessor architecture and a pipelined structure. It can recognize up to 340 isolated words or 40 connected words in real time. The SRP contains a vector distance calculator, a DP-equation calculator, and an I/O controller operating in a pipelined manner. Algorithm variations and operation parameters are user programmable, and the total size of the SRP program for a typical speech recognition system is about 700 words. The device has been fabricated with n-channel Si-gate E/D MOS technology with 2.5 μm design rules and employs 7296 three-transistor dynamic RAM cells for a total of more than 40 000 transistors.

Microprocessor

Calculator

10.1109/jsac.1985.1146207

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Citations (3)

Erratum: Publisher's note - Observation of the ηc(2S) in exclusive B → KKSK-π+ decays (Physical Review Letters (2002) 89 (102001))

Physical Review Letters (2002)

S. K. Choi S. L. Olsen K. Abe R. Abe K. Abe

Source

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Citations (0)

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

Source

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[Use of pit and fissure sealant for the deciduous 2d molars].

PubMed (1986)

Naoki Ohnishi E Takemura Kiyoshi Arai A Oguma Y. Kawakami

Fissure

Source

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Citations (1)

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

Source

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Citations (2)

Evidence for the Electroweak Penguin Decay $B \to X_{s}\ell^{+}\ell^{-}$}

arXiv (Cornell University) (2001)

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

We report a search for the flavor-changing neutral current decay $B \to X_{s} \ell^{+} \ell^{-}$ using a 29.5 fb$^{-1}$ data sample accumulated at the $Υ(4S)$ resonance with the Belle detector at the KEKB $e^{+}e^{-}$ storage ring. We observe evidence for $B\to Kμ^+μ^-$ and report the preliminary branching fraction of ${\cal B}(B \to K μ^{+} μ^{-}) = (0.99^{+0.39}_{-0.32}^{+0.13}_{-0.15}) \times 10^{-6}$. We also set the following 90% confidence level upper limits on the branching fractions for exclusive and inclusive decays, ${\cal B}(B \to K e^{+} e^{-}) < 1.2 \times 10^{-6}$, ${\cal B}(B \to K^*(892) e^{+} e^{-}) < 5.1 \times 10^{-6}$, ${\cal B}(B \to K^*(892) μ^{+} μ^{-}) < 3.0 \times 10^{-6}$, ${\cal B}(B \to X_{s} e^{+} e^{-}) < 10.1 \times 10^{-6}$, ${\cal B}(B \to X_{s} μ^{+} μ^{-}) < 19.1 \times 10^{-6}$.

10.48550/arxiv.hep-ex/0107072

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Citations (6)