140 citations · 495 across the 56 of their papers we have counts for
55 papers · 1 filter
Proper-time Quantum Mechanics for Multi-Quark System and Composite-Hadron Spectroscopy
Shin Ishida, Tomohito Maeda, Kenji Yamada +1
One of the most important problem in hadron physics is to establish the Lorentz-invariant classification scheme of composite hadrons, extending the framework of non-relativistic qu…
"Quark Confinement" and Evolution of Covariant Hadron-Classification Scheme
Shin Ishida
The extension of Non-Relativistic-to-Covariant classification scheme seems to be an urgent problem in the Hadron Spectroscopy. Here are given the recent results of our research. 1)…
Radiative pi^pm gamma transitions of excited light-quark mesons in the covariant oscillator quark model
Tomohito Maeda, Kenji Yamada, Masuho Oda +1
The COMPASS collaboration, as a part of their hadron spectroscopy program, is going to measure the radiative decay widths of light-quark mesons via the Primakoff reactions. In this…
D_{s1}^{*}(2710) and D_{sJ}^{*}(2860) in the U~(12)*O(3,1)-scheme
Tomohito Maeda, Kenji Yamada, Masuho Oda +1
In order to classify the charmed-strange mesons, including puzzling D_{s0}^{*}(2317) and D_{s1}(2460), and recently observed D_{s1}^{*}(2710) and D_{sJ}^{*}(2860), we employ the U~…
The qqbar S-wave axial-vector mesons in the covariant U~(12)-scheme
Tomohito Maeda, Kenji Yamada, Masuho Oda +1
We study the properties of axial vector mesons a1 and b1 as relativistic S-wave states which are predicted in the U~(12)-scheme, through the analyses of their radiative and pionic…
Radiative Decays of q bar q Chiral States in the U~(12)-Scheme
Tomohito Maeda, Kenji Yamada, Masuho Oda +1
The radiative transitions between ground-states (GS) of light q bar q mesons are investigated in the U~(12)-scheme. In this scheme the rich decay-spectra are offered even in transi…
Physical Origin of Chiral States and Near-Threshold Resonances Observed at BES
Shin Ishida
The purpose of my talk is to explain physical backgrounds of the chiral states, which are predicted to exist generally in the low mass regions of hadrons, containing light quarks,…
The ~U(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and "Exotic" Hadrons
Shin Ishida
Several years ago we have proposed a manifestly covariant -classification scheme of hadrons, which maintains the successful framewo…
Chiral Mass Splitting for c \bar{s} and c \bar{n} Mesons in the \tilde{U}(12)-Classification Scheme of Hadrons
Kenji Yamada, Tomohito Maeda, Shin Ishida
We investigate the chiral mass splitting of parity-doubled J=0,1 states for c \bar{s} and c \bar{n} meson systems in the \tilde{U}(12)_{SF}-classification scheme of hadrons, using…
Four Quark cn - nbar cbar States in U(12)-Scheme and X(3872)/Y(3940)
Muneyuki Ishida, Shin Ishida, Tomohito Maeda
The properties of four quark cn - nbar cbar states are investigated as cn di-quark and nbar cbar di-antiquark system in U(12)-classification scheme of hadrons, recently proposed by…
The DsJ*(2317) and DsJ(2460) mesons in U~(12)-classification scheme of hadrons
Shin Ishida, Muneyuki Ishida, Tomohito Maeda +2
The narrow mesons, DsJ*(2317) and DsJ(2460), observed recently in the final states Ds+ pi0 and Ds*+ pi0 are pointed out to be naturally assigned as the ground-state scalar and axia…
The Ds(2317) and Ds(2463) Mesons as Scalar and Axial-Vector Chiralons in the Covariant Level-Classification Scheme
Shin Ishida, Muneyuki Ishida, Toshihiko Komada +4
The new narrow mesons observed recently in the final states Ds+ pi0 and Ds*+ pi0 are pointed out to be naturally assigned as the ground-state scalar and axial-vector chiralons in t…
Scalar Mesons and Chiral States
Muneyuki Ishida, Shin Ishida
The essential points and physical backgrounds of the covariant level-classification scheme, based on U(12)SF * O(3,1)L, are reviewed: This scheme is extended from the non-relativis…
Ground State Baryons in Covariant Level-Classification Scheme
Muneyuki Ishida, Shin Ishida
In the covariant level-classification scheme of hadrons based on U(12)SF * O(3,1)L symmetry, the ground state baryons and antibaryons are assigned to the (12 * 12 * 12)Sym = 364-mu…
Relation between Scattering and Production Amplitudes -- Case of sigma and kappa in pipi and Kpi Systems --
Muneyuki Ishida, Shin Ishida
In our talk at Nihon university symposium, we have argued that the pipi / Kpi production amplitudes F generally have different structures from those of the pipi / Kpi scattering am…
Properties of sigma and kappa Production Amplitudes
Muneyuki Ishida, Shin Ishida
Our method of analysis, which led to existence of sigma and kappa mesons, is reviewed and examined from a viewpoint of general S-matrix. It is shown that the method is consistent w…
Covariant Classification Scheme of Hadrons and Chiral States
Shin Ishida, Muneyuki Ishida
The essential points and physical backgrounds of the covariant level-classification scheme, recently proposed by us, are reviewed: In this scheme the general composite hadrons are…
Possible Evidence for a Chiral Particle B_0chi, Scalar Meson in the B Meson System
Daiki Ito, Muneyuki Ishida, Shin Ishida +3
In the covariant level-classification scheme of hadrons proposed recently, the existence of "chiral particles", scalar and axial-vector mesons as the partners of the ground-state p…
Possible Evidence for a Chiral Particle D_1chi, Axial-Vector in the D Meson System
Daiki Ito, Muneyuki Ishida, Shin Ishida +3
In the covariant level-classification scheme of hadrons proposed recently, the existence of "chiral particles", scalar and axial-vector mesons as the partners of the ground-state p…
U(12) A New Symmetry Possibly Realizing in Hadron Spectroscopy
Shin Ishida, Muneyuki Ishida
Starting from the multi-local Klein-Gordon equations with Lorentz-scalar squared-mass operator we give a covariant quark representation of the general composite mesons and baryons…
Possible Evidence for a Chiral Axial-Vector State in the D Meson System
Kenji Yamada, Muneyuki Ishida, Shin Ishida +3
We reanalyze the D^{*+} pi^- mass spectrum from CLEO II by the VMW method in order to examine the existence of a chiral axial-vector state, which is predicted in a covariant level-…
Property of Chiral Scalar and Axial-Vector Mesons in Heavy-Light Quark Systems
Muneyuki Ishida, Shin Ishida
Recently we have proposed a new level-classification scheme of hadrons with a manifestly covariant framework. In this scheme the requirement of chiral symmetry on the light quark l…
Covariant Classification Scheme of Hadrons
Shin Ishida, Muneyuki Ishida
Starting from the multi-local Klein-Gordon equations with Lorentz-scalar squared-mass operator we give a covariant quark representation of the general composite mesons and baryons…
Confirmation of sigma(450--600)-Meson in Upsilon' to Upsilon pipi and Other pipi-Production Processes
Muneyuki Ishida, Shin Ishida, Toshihiko Komada +1
Applying the effective amplitude, which is evidently consistent with general constraints from chiral symmetry, the pipi spectra in the relevant processes are analyzed, leading to a…