Tsukasa Aso

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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 report a measurement of the D0-D0 mixing parameter yCP using 23.4 fb−1 of data collected near the Υ(4S) resonance with the Belle detector at KEKB. yCP is measured from the lifetime difference of D0 mesons decaying into the K−π+ state and the CP even eigenstate K−K+. We find yCP = ( −0.5± 1.0 −0.8 ) ×10−2, where the first error is statistical and the(More)
We developed a calculation technique to evaluate the biological dose distribution of heavy ion beams, and verified its reliability by comparison with experimental results. The calculation technique was developed by connecting two general-purpose Monte Carlo codes. In order to evaluate the radiation quality and biological effect, the microdosimetric kinetic(More)
The Particle Therapy Simulation Framework (PTSIM) is a Geant4-based Monte Carlo simulation framework for particle therapy. The PTSIM provides a common platform to model a beam delivery system and a treatment head with patient data obtained from CT images. The PTSIM had already supported three Japanese proton and ion therapy facilities and three more in(More)
Dose calculation for particle therapy has been performed on GRID environments using a Geant4 based particle therapy simulation framework (PTSIM). PTSIM provides a common platform to model a beam line and treatment head with patient data from CT. PTSIM has already provided three of Japanese proton and ion therapy facilities and three more in other countries.(More)
We report a search for the flavor-changing neutral current decay B → Xsl +l− using a 29.5 fb−1 data sample accumulated at the Υ(4S) resonance with Belle detector at the KEKB e+e− storage ring. We observe evidence for B → Kμ+μ− and report the preliminary branching fraction of B(B → Kμ+μ−) = (0.99 −0.32 +0.13 −0.15)× 10−6. We also set the following 90%(More)
We present a measurement of the Standard Model CP violation parameter sin 2φ1 (also known as sin 2β) 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/ψπ 0 CP -eigenstate decay channel and the(More)
P. Krokovny, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, A. Bay, I. Bedny, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi,(More)
Takashi Akagi, Tsukasa Aso, Go Iwai, Akinori Kimura, Satoru Kameoka, Se Beyong Lee, Yoshikazu Maeda, Naruhiro Matsufuji, Teiji Nishio, Chihiro Omachi, Seyjoon Park, Takashi Sasaki, Toshiyuki Toshito, Wataru Takase, Tomohiro Yamashita and Yoshiyuki Watase Hyogo Ion Beam Medical Center, 1-2-1, Kouto, Shinghu-cho, Ibo-gun, Hyogo 679-5165, Japan; Nagaoka(More)