A5105674006- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- International Science and Diplomacy
- Lanthanide and Transition Metal Complexes
- Medical Imaging and Pathology Studies
- Digital Radiography and Breast Imaging
- Biotin and Related Studies
- Plasma Diagnostics and Applications
Obayashi (Japan)
2016-2025
Nagoya University
2016-2025
Fermi National Accelerator Laboratory
2024
University of Chicago
2024
European Organization for Nuclear Research
2023-2024
A. Alikhanyan National Laboratory
2024
AGH University of Krakow
2023-2024
Jagiellonian University
2024
Rutherford Appleton Laboratory
2017-2024
Atlas Scientific (United States)
2024
The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb(-1) data sample collected by the Belle detector at or near Υ(nS) (n = 1,2,…,5) resonances. Y(4260) state observed, its resonance parameters are determined. In addition, an excess of production around 4 observed. This feature can be described Breit-Wigner parametrization properties that consistent Y(4008) was previously reported Belle. study decays, structure observed in M(π(±)J/ψ) mass spectrum 5.2σ...
We perform a full amplitude analysis of B0→ψ′K+π− decays, with ψ′→μ+μ− or e+e−, to constrain the spin and parity Z(4430)−. The JP=1+ hypothesis is favored over 0−, 1−, 2− 2+ hypotheses at levels 3.4σ, 3.7σ, 4.7σ 5.1σ, respectively. based on 711 fb−1 data sample that contains 772×106 BB¯ pairs collected Υ(4S) resonance by Belle detector asymmetric-energy e+e− collider KEKB.7 MoreReceived 20 June 2013DOI:https://doi.org/10.1103/PhysRevD.88.074026© 2013 American Physical Society
We present results from a study of $X(3872)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}J/\ensuremath{\psi}$ decays produced via exclusive $B\ensuremath{\rightarrow}KX(3872)$ decays. determine the mass to be ${M}_{X(3872)}=(3871.85\ifmmode\pm\else\textpm\fi{}0.27(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.19(\mathrm{syst}))\text{ }\text{ }\mathrm{MeV}$, 90% confidence level upper limit on natural width ${\ensuremath{\Gamma}}_{X(3872)}<1.2\text{ product branching fraction...
We report a study of $B\to (J/\psi \gamma) K$ and (\psi' \gamma)K$ decay modes using $772\times 10^{6}$ $B\bar{B}$ events collected at the \Upsilon(4S)$ resonance with Belle detector KEKB energy-asymmetric $e^+ e^-$ collider. observe $X(3872) \to J/\psi \gamma$ first evidence for $\chi_{c2} in (X_{c\bar{c}}\gamma) decays, while search \psi' no significant signal is found. measure branching fractions, $\mathcal{B}(B^{\pm} X(3872) K^{\pm}) \mathcal{B}(X(3872) J/\psi\gamma)$ $=$...
We report on a search for heavy neutrinos in B-meson decays. The results are obtained using data sample that contains 772x10^6 BB-bar pairs collected at the Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. No signal is observed and upper limits set mixing of left-handed Standard Model mass range 0.5 - 5.0 GeV/c^2.
We present measurements of B+→¯¯¯D*0τ+ντ and B+→¯¯¯D0τ+ντ decays in a data sample 657×106 B¯¯¯B pairs collected with the Belle detector at KEKB asymmetric-energy e+e− collider. find 446+58−56 events significance 8.1 standard deviations, 146+42−41 3.5 deviations. The latter signal provides first evidence for this decay mode. measured branching fractions are B(B+→¯¯¯D*0τ+ντ)=(2.12+0.28−0.27(stat)±0.29(syst))% B(B+→¯¯¯D0τ+ντ)=(0.77±0.22(stat)±0.12(syst))%.Received 13 May...
We present a measurement of the charmless semileptonic decay $B^0\to\pi^-\ell^+\nu$ using data sample containing 657$\times 10^6$ $B\bar{B}$ events collected with Belle detector at KEKB asymmetric-energy $e^+e^-$ collider operating near $\Upsilon(4S)$ resonance. determine total branching fraction decay, $\mathcal{B}(B^0\to\pi^-\ell^+\nu)=(1.49\pm 0.04{(\mathrm{stat})}\pm 0.07{(\mathrm{syst})})\times 10^{-4}$. also report new precise differential rate, and extract Cabibbo-Kobayashi-Maskawa...
The interference fragmentation function translates the of a quark with transverse projection spin into an azimuthal asymmetry two final-state hadrons. In e+e- annihilation product functions is measured. We report nonzero asymmetries for pairs charge-ordered pi+pi- pairs, which indicate significant in this channel. results are obtained from 672 fb-1 data sample that contains 711 \times 106 and was collected at near ?(4S) resonance, Belle detector KEKB asymmetric-energy collider.
We report measurements of B→χ(c1)γK and χ(c2)γK decays using 772×10(6) BB[over ¯] events collected at the Υ(4S) resonance with Belle detector KEKB asymmetric-energy e(+)e(-) collider. Evidence a new in χ(c1)γ final state is found statistical significance 3.8σ. This has mass 3823.1±1.8(stat)±0.7(syst) MeV/c(2), value that consistent theoretical expectations for previously unseen 1(3)D(2) cc[over meson. find no other narrow set upper limits on branching fractions X(3872)→χ(c1)γ χ(c2)γ decays.
We report results of a study doubly charmed baryons and strange baryons. The analysis is performed using $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. search for ${\mathrm{\ensuremath{\Xi}}}_{cc}^{+(+)}$ ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}({\ensuremath{\pi}}^{+})$...
We report the first evidence for ${\ensuremath{\eta}}_{b}(2S)$ using ${h}_{b}(2P)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(2S)\ensuremath{\gamma}$ transition and observation of ${h}_{b}(1P)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(1S)\ensuremath{\gamma}$ ${h}_{b}(2P)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(1S)\ensuremath{\gamma}$ transitions. The mass width ${\ensuremath{\eta}}_{b}(1S)$ are measured to be...
The differential cross section for the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{0}$ has been measured in kinematic range $0.84\text{ }\text{ }\mathrm{GeV}<W<4.0\text{ }\mathrm{GeV}$, $|\mathrm{cos}{\ensuremath{\theta}}^{*}|<0.8$, where $W$ and ${\ensuremath{\theta}}^{*}$ are energy ${\ensuremath{\pi}}^{0}$ (or $\ensuremath{\eta}$) scattering angle, respectively, $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass system....
We present a new measurement of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}c\overline{c}$ cross section where $c\overline{c}$ pair can fragment either into charmed hadrons or charmonium state. In former case $J/\ensuremath{\psi}$ and hadron are reconstructed, while latter process is measured using recoil mass technique, which allows identification two-body final states without reconstruction one charmonia. The...
We report measurements of the branching fractions and direct CP asymmetries (A_{CP}) for B->K pi, pi KK decays (but not pi^0 pi^0) based on final data sample 772x10^6 B B-bar pairs collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e^+ e^- collider. set a 90% confidence-level upper limit K^+- K^-+ 2.0x10^{-7}; all other are observed ranging from 10^{-6} to 10^{-5}. In $B^0/B^0-bar -> K^+-\pi^-+ mode, we confirm Belle's previously reported large A_{CP} value -0.069...
A bstract We present measurements of absolute branching fractions hadronic and lep-tonic $ D_s^{+} decays to K − + π , {{\overline{K}}^0} ηπ μ ν τ report a search for the leptonic → e decays. The results are obtained from data sample 913 fb −1 collected at or near \varUpsilon (4 S ) (5 resonances with Belle detector KEKB asymmetric-energy collider. measured be \begin{array}{*{20}{c}} {\mathcal{B}\left( {D_s^{+}\ \to\ {K^{-}}{K^{+}}{\pi^{+}}} \right) = \left( {5.06\pm 0.15\pm 0.21}...
We search for lepton-flavor-violating and lepton-number-violating tau decays into a lepton (l = electron or muon) two charged mesons (h, h' pion Kaon) using 854 fb^{-1} of data collected with the Belle detector at KEKB asymmetric-energy e^+e^- collider. obtain 90% confidence level upper limits on to lhh' branching fractions in range (2.0-8.4)*10^{-8}. These results improve upon our previously published by factors about 1.8 average.
We present the first measurement of angle phi_3 Unitarity Triangle using a model-independent Dalitz plot analysis B->DK, D->KsPiPi decays. The method uses an input measurements strong phase amplitude from CLEO collaboration. result is based on full data set 772x10^6 BBbar pairs collected by Belle experiment at Upsilon(4S) resonance. obtain = (77.3^{+15.1}_{-14.9} +- 4.1 4.3)^{\circ} and suppressed ratio r_B 0.145 0.030 0.010 0.011. Here error statistical, second experimental systematic...
We report the observation of B(s)⁰→J/ψf₀(980) and evidence for B(s)⁰→J/ψf₀(1370), which are CP eigenstate decay modes. These results obtained from 121.4 fb⁻¹ data collected at Υ(5S) resonance with Belle detector KEKB e(+)e⁻ collider. measure branching fractions B(B(s)⁰→J/ψf₀(980); f₀(980)→π(+)π⁻)=(1.16(-0.19)(+0.31)(stat)(-0.17)(+0.15)(syst)(-0.18)(+0.26)(N(B(s)((*))B(s)((*)))))×10⁻⁴ a significance 8.4σ, B(B(s)⁰→J/ψf₀(1370);...
We report a measurement of $CP$ violating asymmetries in ${B}^{0}({\overline{B}}^{0})\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}_{S}^{0}$ decays with time-dependent Dalitz approach. This analysis is based on data sample $657\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs accumulated at the $\ensuremath{\Upsilon}(4S)$ resonance Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. As result an unbinned maximum likelihood fit to selected...
We present a time-dependent Dalitz plot measurement of CP violation parameters in B0 --> Ks Pi+ Pi- decays. These results are obtained from large data sample that contains 657 million BBbar pairs collected at the Y(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. For parameters, we obtain two consistent solutions describe well. The first these may be preferred by external information other measurements. There is no evidence for direct rho0(770) Ks, f0(980) and K*+(892)...
We have made a precise measurement of the absolute branching fractions Bs->Ds(*)+ Ds(*)- decays using 121.4 fb-1 data recorded by Belle experiment running on Upsilon(5S) resonance. The results are B(Bs0->Ds+ Ds-) = (0.58 +0.11 -0.09 +-0.13)%, B(Bs0->Ds*+- Ds-+) (1.8 +-0.2 +-0.4)%, and B(Bs0->Ds*+ Ds*-) (2.0 +-0.3 +-0.5)%; sum is B(Bs0->Ds(*)+ (4.3 +-0.4 +-1.0)%. Assuming saturates to CP-even final states, fraction constrains ratio Delta(Gamma_s)/cos(phi_s), where Delta(Gamma_s) difference in...
We observe evidence for CP violation in the decay D+ → K(S)(0)π+ using a data sample with an integrated luminosity of 977 fb(-1) collected by Belle detector at KEKB e+ e- asymmetric-energy collider. The asymmetry is measured to be (-0.363±0.094±0.067)%, which 3.2 standard deviations away from zero, and consistent expected due neutral kaon final state.
We measure the branching fractions of ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\eta}}^{(\ensuremath{'})}$ decays with complete Belle data sample $772\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $\ensuremath{\Upsilon}(4S)$ resonance detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The results for are:...
Decays of the $\ensuremath{\Upsilon}(5\mathrm{S})$ resonance to channels with ${B}^{+}$ and ${B}^{0}$ mesons are studied using a $23.6\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Fully reconstructed ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$, ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*0}$,...