A5100610040- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Radiopharmaceutical Chemistry and Applications
- Gamma-ray bursts and supernovae
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Radioactive Decay and Measurement Techniques
Tokyo Metropolitan University
2015-2025
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
Boston University
2013-2023
Duke University
2018-2023
Universidad Autónoma de Madrid
2018-2023
University of California, Irvine
2013-2023
Colorado State University
2021-2023
University of Colorado Boulder
2018
We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ based on $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is fully reconstructed as $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$,...
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade is under construction, to increase luminosity by two orders magnitude during a three-year shutdown, with ultimate goal 8E35 /cm^2 /s luminosity. To exploit increased luminosity, been proposed. A new international collaboration Belle-II, being formed. Technical Design Report presents physics motivation, basic methods accelerator upgrade, as...
We present an improved measurement of the standard model CP violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ (also known as $\mathrm{sin}2\ensuremath{\beta})$ based on a sample $85\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral B meson is reconstructed in $J/\ensuremath{\psi}{K}_{S}^{0},$...
We present improved measurements of $CP$-violation parameters in ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{K}^{0}$, ${\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0}$, ${K}_{S}^{0}{K}_{S}^{0}{K}_{S}^{0}$ decays based on a sample $535\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB energy-asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. obtain...
We present a measurement of the standard model CP violation parameter sin2 phi(1) (also known as sin2beta) based on 10.5 fb(-1) data sample collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric e(+)e(-) collider. One neutral B meson is reconstructed in J/psiK(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psiK(L), or J/psipi(0) CP-eigenstate decay channel and flavor accompanying identified from its charged particle products. From asymmetry distribution time interval between two...
Using a $282\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected by the Belle experiment at KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, we study ${D}^{0}$ decays to ${K}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu}$ final states. The flavor momentum are tagged through full reconstruction of recoiling charm meson additional mesons from fragmentation. method provides very good...
We report a determination of the B(0)(d)-&B_(0)(d) mixing parameter Deltam(d) based on time evolution dilepton yields in Upsilon(4S) decays. The measurement is 5.9 fb(-1) data sample collected by Belle detector at KEKB. proper-time difference distributions for same-sign and opposite-sign events are simultaneously fitted to an expression containing as free parameter. Using both muons electrons, we obtain = 0.463+/-0.008 (stat)+/-0.016 (syst) ps(-1). This first from measurements Upsilon(4S)....
We present a precise measurement of the standard model $CP$-violation parameter $\mathrm{sin}2{\ensuremath{\phi}}_{1}$, direct $CP$ violation $|\ensuremath{\lambda}|$, lifetimes charged and neutral $B$ mesons their ratio, ${B}^{0}$-${\overline{B}}^{0}$ mixing $\ensuremath{\Delta}{m}_{d}$ based on sample $152\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy...
We present new measurements of CP-violation parameters in B0 -> phiK0, K+K-Ks, f0(980)Ks, eta'Ks, omegaKs and Kspi0 decays based on a sample 275 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with Belle detector KEKB energy-asymmetric e+e- collider. One neutral B meson is fully reconstructed one specified decay channels, flavor accompanying identified from its products. for each modes are obtained asymmetries distributions proper-time intervals between two decays. The combined...
We report measurements of the branching fractions for B0→π+π−, K+π−, K+K−, and K0π0 B+→π+π0, K+π0, K0π+, K+¯K0, based on 10.4fb−1 data collected Υ(4S) resonance with Belle detector. find B(B0→π+π−)=(0.56+0.23+0.04−0.20−0.05)×10−5, B(B0→K+π−)=(1.93+0.34+0.15−0.32−0.06)×10−5, B(B+→K+π0)=(1.63+0.35+0.16−0.33−0.18)×10−5, B(B+→K0π+)=(1.37+0.57+0.19−0.48−0.18)×10−5, B(B0→K0π0)=(1.60+0.72+0.25−0.59−0.27)×10−5. also set upper limits B0→K+K−, B+→K+¯K0.Received 17 April...
We report the first observation of CP-violating asymmetries in B0 --> pi+pi- decays based on a 140 fb-1 data sample collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. reconstruct one neutral B meson as CP eigenstate and identify flavor accompanying from its decay products. apply an unbinned maximum likelihood fit to distribution time intervals between two points. The yields asymmetry amplitudes Apipi = +0.58+/-0.15(stat)+/-0.07(syst) Spipi...
We report measurements of the charmless semileptonic decays B0→π−/ρ−ℓ+ν and B+→π0/ρ0ℓ+ν, based on a sample 2.75×108 BB¯ events collected at ϒ(4S) resonance with Belle detector KEKB e+e− asymmetric collider. In this analysis, accompanying B meson is reconstructed in mode B→D(∗)ℓν, enabling detection signal modes high purity. measure branching fractions B(B0→π−ℓ+ν)=(1.38±0.19±0.14±0.03)×10−4, B(B0→ρ−ℓ+ν)=(2.17±0.54±0.31±0.08)×10−4, B(B+→π0ℓ+ν)=(0.77±0.14±0.08±0.00)×10−4...
We report a search for the flavor-changing neutral current decay B-->K(*)l+l- using 29.1 fb(-1) data sample accumulated at Upsilon(4S) resonance with Belle detector KEKB e+e- storage ring. observe process B-->Kl+l-(l = e, mu), first time, branching fraction of B(B-->Kl+l-) (0.75(+0.25)(-0.21)+/-0.09)x10(-6).
As long-baseline neutrino experiments enter the precision era, difficulties associated with understanding interaction cross sections on atomic nuclei are expected to limit experimental sensitivities oscillation parameters. In particular, ability relate observables energy in previous has relied solely theoretical models of neutrino-nucleus interactions, which currently suffer from very large uncertainties. By observing charged current $ν_μ$ interactions over a continuous range off-axis angles...
Abstract We have investigated the status of nuclear fuel assemblies in Unit-1 reactor Fukushima Daiichi power plant by cosmic muon radiography. In this study, tracking detectors were placed outside building. succeeded identifying inner structure complex, such as containment vessel, pressure and other structures building, through concrete wall found that a large number missing original loading zone inside vessel. The natural interpretation is most was melted dropped down to bottom vessel or...
This article describes an observation of mixing-induced $\mathrm{CP}$ violation and a measurement the parameter, $\mathrm{sin}2{\ensuremath{\varphi}}_{1},$ with Belle detector at KEKB asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. Using data sample $29.1 {\mathrm{fb}}^{\ensuremath{-}1}$ recorded on $\ensuremath{\Upsilon}(4S)$ resonance that contains 31.3 million $B\overline{B}$ pairs, we reconstruct decays neutral B mesons to following eigenstates: $J/\ensuremath{\psi}{K}_{S}^{0},$...
We present a measurement of $CP$ asymmetry using time-dependent Dalitz plot analysis ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays based on $414\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample containing $449\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs. The was collected the $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector at KEKB asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$...
We report preliminary results on the analysis of three-body Y(10860)=> B barB pi, Y(10860) => (B barB* + c.c.) pi and B* decays including an observation Zb(10610)+- pi-+ [B barB*+c.c]+- Zb(10650)+- [B* barB*]+- as intermediate channels. measure branching fractions to be Br(Y(10860)=> barB*+c.c.]+- pi-+)=(28.3+-2.9+-4.6)x10^{-3} pi-+)=(14.1+-1.9+-2.4)x10^{-3} set 90% C.L. upper limit barB]+- pi-+)<4.0x10^{-3}. also amplitude Y(10860)=>Y(nS)pi+pi-, n=1,2,3 internal structure...
Null points in magnetic fields destroy the adiabatic invariants of charged particle motion, resulting a chaotic motion. The mixing effect chaos produces efficient collisionless heating electrons. entropy production is represented by an effective resistance macroscopic description. This ``chaos-induced resistance'' enables plasma at low gas pressure suitable for ultrafine etching.