A5038054806- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Quantum chaos and dynamical systems
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Cold Fusion and Nuclear Reactions
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Astrophysics and Cosmic Phenomena
- Electron Spin Resonance Studies
- Quantum, superfluid, helium dynamics
Osaka University
2006-2019
High Energy Accelerator Research Organization
2015-2018
Japan Proton Accelerator Research Complex
2015-2017
Institute of Particle and Nuclear Studies
2015-2017
Okayama University
2015
Tokyo University of Science
2015
Kyoto University
2015
The University of Tokyo
2015
Argonne National Laboratory
2014
Thomas Jefferson National Accelerator Facility
2009-2012
The nucleon resonances are investigated within a dynamical coupled-channels model of $\ensuremath{\pi}N$ and $\ensuremath{\gamma}N$ reactions up to the invariant mass $W=2$ GeV. meson-baryon ($MB$) channels included in calculations $MB=$ $\ensuremath{\pi}N$, $\ensuremath{\eta}N$, $K\ensuremath{\Lambda}$, $K\ensuremath{\Sigma}$, $\ensuremath{\pi}\ensuremath{\pi}N$ that has $\ensuremath{\pi}\ensuremath{\Delta}$, $\ensuremath{\rho}N$, $\ensuremath{\sigma}N$ resonant components. amplitudes...
We show that two almost degenerate poles near the $\pi\Delta$ threshold and next higher mass pole in $P_{11}$ partial wave of $\pi N$ scattering evolve from a single bare state through its coupling with N$, $\eta $\pi\pi reaction channels. This finding provides new information on understanding dynamical origins Roper $N^*(1440)$ $N^*(1710)$ resonances listed by Particle Data Group. Our results for resonance other waves are also presented.
We study the resonance energy of strange dibaryons using two models with energy-independent and energy-dependent potentials for s-wave barKN interaction, both which are derived by certain reductions from leading order term effective chiral Lagrangian. These potential produce rather different off-shell behaviors two-body - piSigma amplitudes in I=0 channel, i.e., model (energy-dependent) predicts one (two) pole Lambda(1405) region, while they describe available data equally well. find that...
A new generation of complete experiments is focused on a high precision extraction pseudoscalar meson photoproduction amplitudes. Here, we review the development most general analytic form cross section, dependent upon three polarization vectors beam, target and recoil baryon, including all single-, double- triple-polarization terms involving 16 spin-dependent observables. We examine different conventions that have been used by authors, present expressions allow direct numerical calculation...
A dynamical coupled-channels (DCC) model for neutrino-nucleon reactions in the resonance region is developed. Starting from DCC that we have previously developed through an analysis of $\ensuremath{\pi}N,\ensuremath{\gamma}N\ensuremath{\rightarrow}\ensuremath{\pi}N,\ensuremath{\eta}N,K\mathrm{\ensuremath{\Lambda}},K\mathrm{\ensuremath{\Sigma}}$ reaction data $W\ensuremath{\le}2.1\text{ }\text{ }\mathrm{GeV}$, extend vector current to ${Q}^{2}\ensuremath{\le}3.0\text{ }(\mathrm{GeV}/c{)}^{2}$...
The authors develop a dynamical coupled-channels model for kaon-nucleon reactions that satisfies unitarity. overcomes limitations of previous approaches to study baryon resonances with strangeness below 2 GeV and their decay. resultant amplitudes can play an important role in predicting hyperon production kaon-nucleus reactions.
By extending the dynamical coupled-channels analysis performed in our previous work [Phys. Rev. C 88, 035209 (2013)] to include available data of photoproduction pi meson off neutron, transition amplitudes for photo-excitation neutron nucleon resonances, gamma n --> N*, at resonance pole positions are determined. The combined fits both proton- and neutron-target reactions also revise results p N* amplitudes. Our allow an isospin decomposition N I=1/2 which is necessary testing hadron...
We have performed a dynamical coupled-channels analysis of available $p(e,{e}^{\ensuremath{'}}\ensuremath{\pi})N$ data in the region $W\ensuremath{\leqslant}1.6$ GeV and ${Q}^{2}\ensuremath{\leqslant}1.45$ (GeV/$c$)${}^{2}$. The channels included are ${\ensuremath{\gamma}}^{*}N$, $\ensuremath{\pi}N$, $\ensuremath{\eta}N$, $\ensuremath{\pi}\ensuremath{\pi}N$ that has $\ensuremath{\pi}\ensuremath{\Delta}$, $\ensuremath{\rho}N$, $\ensuremath{\sigma}N$ components. With hadronic parameters model...
A unitary coupled-channels model is presented for investigating the decays of heavy mesons and excited meson states into three light pseudoscalar mesons. The accounts three-mesons final state interactions in decay processes, as required by both three-body two-body unitarity conditions. In absence $Z$-diagram mechanisms that are necessary consequences unitarity, our amplitudes reduced to a form similar those used so-called isobar-model analysis. We apply three-pions ${a}_{1}(1260)$,...
Resonance parameters (pole masses and residues) associated with the excited states of hyperons, ${\mathrm{\ensuremath{\Lambda}}}^{*}$ ${\mathrm{\ensuremath{\Sigma}}}^{*}$, are extracted within a dynamical coupled-channels model developed recently by us [Phys. Rev. C 90, 065204 (2014)] through comprehensive partial-wave analysis...
As a step toward performing complete coupled-channels analysis of the world data $\ensuremath{\pi}N,{\ensuremath{\gamma}}^{*}N\ensuremath{\rightarrow}\ensuremath{\pi}N,\ensuremath{\eta}N,\ensuremath{\pi}\ensuremath{\pi}N$ reactions, $\ensuremath{\pi}N\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}N$ reactions are investigated starting with dynamical model developed in Phys. Rev. C 76, 065201 (2007). The channels included $\ensuremath{\pi}N,\ensuremath{\eta}N$, and...
We show that two ${P}_{11}$ nucleon resonance poles near the $\ensuremath{\pi}\ensuremath{\Delta}$ threshold, obtained in several analyses, are stable against large variations of parameters within a dynamical coupled-channels analysis based on meson-exchange mechanisms. By also performing an model with bare state, we find this two-pole structure is insensitive to analytic amplitude region below $\ensuremath{\pi}N$ threshold. Our results...
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...
A precise description of neutrino-nucleus reactions will play a key role in addressing fundamental questions such as the leptonic CP violation and neutrino mass hierarchy through analyzing data from next-generation oscillation experiments. The energy relevant to spans broad range and, accordingly, dominant reaction mechanism varies across region quasi-elastic scattering nucleon resonance excitations deep inelastic scattering. This corresponds transitions effective degree freedom for...
JLDG is a data-grid for the lattice QCD (LQCD) community in Japan. Several large research groups Japan have been working on simulations using supercomputers distributed over distant sites. The provides such collaborations with an efficient method of data management and sharing.
Within a dynamical coupled-channels model that has already been fixed by analyzing the data of $\ensuremath{\pi}N\ensuremath{\rightarrow}\ensuremath{\pi}N$ and $\ensuremath{\gamma}N\ensuremath{\rightarrow}\ensuremath{\pi}N$ reactions, we present predicted double pion photoproduction cross sections up to second resonance region, $W<1.7$ GeV. The roles played different mechanisms within our in determining both single reactions are analyzed, focusing on effects attributable direct...
We investigate the model dependence of meson resonance properties extracted from Dalitz-plot analysis three-pions photo-production reactions on nucleon. Within a unitary developed in our earlier work, we generate distributions as data to perform an isobar fit that is similar most previous analyses three-pion production reactions. It found positions two models agree well when both accurately, except for poles near branch points. The residues resonant amplitudes and by usual Breit-Wigner...
As a first step toward developing reaction model that enables comprehensive description of neutrino-nucleon reactions in the nucleon resonance region, we have applied for time dynamical coupled-channels model, which successfully describes \pi N, \gamma N --> \eta K\Lambda, K\Sigma up to W = 2 GeV, predict neutrino-induced meson-production with \Delta S 0 at forward angle limit. This has been achieved by relating divergence axial-current matrix elements Q^2 X amplitudes through PCAC...
The scattering length and effective range of the piSigma channel are studied in order to characterize strangeness S=-1 meson-baryon Lambda(1405) resonance. We examine various off-shell dependence amplitude dynamical chiral models evaluate threshold quantities with constraint at KbarN threshold. find that parameters important structure resonance provide further constraints on subthreshold extrapolation interaction.
The current and near-future neutrino-oscillation experiments require significantly improved neutrino-nucleus reaction models. Neutrino-nucleon pion production data play a crucial role to validate corresponding elementary amplitudes that go into such Thus, the currently available extracted from charged-current neutrino-deuteron (${\ensuremath{\nu}}_{\ensuremath{\mu}}d\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}\ensuremath{\pi}NN$) must be corrected for nuclear effects as Fermi...
Motivated by an experimental proposal for the measurement of pi N --> reactions at J-PARC, we examine a potential impact cross section data on determination resonance parameters high-mass N* states. For this purpose, make use ANL-Osaka dynamical coupled-channels model, which has been developed recently combined analysis unpolarized as well polarized observables pion- and photon-induced N, eta K Lambda, Sigma production off proton target. We present predictions total sections invariant...
An approach for relating the nucleon resonances extracted from $\ensuremath{\pi}N$ reaction data to lattice QCD calculations has been developed by using finite-volume Hamiltonian method. Within models of reactions, bare states are introduced parametrize intrinsic excitations nucleon. We show that resonance can be related probability ${P}_{{N}^{*}}(E)$ finding state, ${N}^{*}$, in scattering infinite volume. further demonstrate ${P}_{{N}^{*}}^{V}(E)$ same eigenfunctions underlying finite...
A model for the $\overline{K}d\ensuremath{\rightarrow}\ensuremath{\pi}YN$ reactions with $Y=\mathrm{\ensuremath{\Lambda}},\mathrm{\ensuremath{\Sigma}}$ is developed, aiming at establishing low-lying $\mathrm{\ensuremath{\Lambda}}$ and $\mathrm{\ensuremath{\Sigma}}$ hyperon resonances through analyzing forthcoming data from J-PARC E31 experiment. The off-shell amplitudes generated dynamical coupled-channels (DCC) model, which was developed in Kamano et al. [Phys. Rev. C 90, 065204 (2014)],...