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The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3)  eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst).(More)
The Belle detector was designed and constructed to carry out quantitative studies of rare B-meson decay modes with very small branching fractions using an asymmetric eþe collider operating at the U(4S) resonance, the KEK-B-factory. Such studies require data samples containing B10 B-meson decays. The Belle detector is configured around a 1:5 T(More)
We present a measurement of the standard model CP violation parameter sin2 phi(1) (also known as sin2beta) based on a 10.5 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e(+)e(-) collider. One neutral B meson is reconstructed in the J/psiK(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psiK(L), or(More)
We present a measurement of the Standard Model CP violation parameter sin 2φ1 based on a 10.5 fb −1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric e+e− collider. One neutral B meson is reconstructed in the J/ψKS , ψ(2S)KS , χc1KS , ηcKS , J/ψKL or J/ψπ0 CP -eigenstate decay channel and the flavor of the(More)
We are developing a new type of photon detector in preparation of an experiment to search for muons decaying into positrons and gamma rays. In the experiment, the photon detector will utilize liquid xenon (Xe) as the scintillation material because of its fast response, large light yield, and high density. The scintillation light emitted in liquid Xe will be(More)
We report a determination of the B(0)(d)-&B_(0)(d) mixing parameter Deltam(d) based on the time evolution of dilepton yields in Upsilon(4S) decays. The measurement is based on a 5.9 fb(-1) data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to(More)
We have reported the current development status of the graphite target for J-PARC neutrino beam-line. The conceptual design, the lifetime estimation, the cooling method based of the latest design, and the prototype productions are discussed.
During the summer shutdown of 2003 the new silicon vertex detector SVD2 was installed in Belle at the KEKB factory and started to take data in october 2003. It provides important improvements in the tracking capabilities and includes trigger functionality. In addition a new hardware trigger Level 1.5 was 1111 Riken/Brookhaven Research Center, BNL,(More)
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