a new symmetry possibly realizing in hadron spectroscopy

Ishida, Shin; Ishida, Muneyuki

doi:10.1016/s0370-2693(02)02087-7

Cited by 11 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A repulsive background interaction could stem from left-hand singularities [1035] which are usually omitted in fits to the data. Ishida san and collaborators interpret the (485) as a relativistic qq state in an S-wave, making the lowest mass scalar mesons to a nonet of 'chiralons' [1036,1037]. Weinberg [1038] showed that the isoscalar S-wave scattering amplitude vanishes when the momenta of the pions go to zero, growing linearly with increasing s. The conflict between this consequence of chiral symmetry and unitarity requires the existence of a low-mass pole (see however [1039]).…”

Section: Other Interpretationsmentioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

View full text Add to dashboard Cite

Glueballs, hybrids and multiquark states are predicted as bound states in models guided by quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the (scalar) glueball ground state are in the mass range from 1000 to 1800 MeV, followed by a tensor and a pseudoscalar glueball at higher mass. Experiments have reported evidence for an abundance of meson resonances with 0 −+ , 0 ++ and 2 ++ quantum numbers. In particular, the sector of scalar mesons is full of surprises starting from the elusive and mesons. The a 0 (980) and f 0 (980), discussed extensively in the literature, are reviewed with emphasis on their Janus-like appearance as KK molecules, tetraquark states or qq mesons. Most exciting is the possibility that the three mesons f 0 (1370), f 0 (1500), and f 0 (1710) might reflect the appearance of a scalar glueball in the world of quarkonia. However, the existence of f 0 (1370) is not beyond doubt and there is evidence that both f 0 (1500) and f 0 (1710) are flavour octet states, possibly in a tetraquark composition. We suggest a scheme in which the scalar glueball is dissolved into the wide background into which all scalar flavour-singlet mesons collapse.There is an abundance of meson resonances with the quantum numbers of the . Three states are reported below 1.5 GeV/c 2 whereas quark models expect only one, perhaps two. One of these states, (1440), was the prime glueball candidate for a long time. We show that (1440) is the first radial excitation of the meson.Hybrids may have exotic quantum numbers which are not accessible by qq mesons. There are several claims for J P C = 1 −+ exotics, some of them with properties as predicted from the flux tube model interpreting the quark-antiquark binding by a gluon string. The evidence for these states depends partly on the assumption that meson-meson interactions are dominated by s-channel resonances. Hybrids with non-exotic quantum numbers should appear as additional states. Light-quark mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers. Two states do not fall under this classification. They are discussed as hybrid candidates.The concept of multiquark states has received revived interest due to new resonances in the spectrum of states with open and hidden charm. The new states are surprisingly narrow and their masses and their decay modes often do not agree with simple quark-model expectations.Lattice gauge theories have made strong claims that glueballs and hybrids should appear in the meson spectrum. However, the existence of a scalar glueball, at least with a reasonable width, is highly questionable. It is possible that hybrids will turn up in complex multibody final states even though so far, no convincing case has been made for them by experimental data. Lattice gauge theories fail to identify the nonet of scalar mesons. Thus, at the present status of approximations, lattice gauge theories seem not to provide a trustworthy guide into unknown territory ...

show abstract

Section: Other Interpretationsmentioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

View full text Add to dashboard Cite

show abstract

“…In this work, focusing exclusively on charmed strange mesons, we investigate systematically the strong decays with one pseudoscalar emission by using the covariant oscillator quark model (COQM). In order to construct the wave functions (WF) of composite sc mesons, we employ the U (4) DS × O(3, 1) L -scheme 6) which corresponds to a covariant extension of conventional SU (2) σ × O(3) L -scheme adopted in non-relativistic quark models (NRQM). A key ingredient of this scheme is the introduction of a new degree of freedom SU (2) ρ , called ρ-spin, in addition to the conventional Pauli-spin SU (2) σ .…”

Section: §1 Introductionmentioning

confidence: 99%

Strong Decays of sc Mesons in the Covariant Oscillator Quark Model with the \widetildeU(4)DS ×O(3,1)L-Classification Scheme

Maeda

Yamada

Oda

et al. 2010

Progress of Theoretical Physics Supplement

Self Cite

View full text Add to dashboard Cite

We investigate the strong decays with one pseudoscalar emission of charmed strange mesons in the covariant oscillator quark model. The wave functions of composite sc mesons are constructed as the irreducible representations of the e U (4) DS × O(3, 1) L . Through the observed mass and results of decay study we discuss a novel assignment of observed charmed strange mesons from the viewpoint of the e U (4) DS × O(3, 1) L -classification scheme. It is shown that D * s0 (2317) and D s1 (2460) are consistently explained as ground state chiralons, appeared in the e U (4) DS × O(3, 1) L scheme. Furthermore, it is also found that recentlyobserved D * s1 (2710) could be described as first excited state chiralon. We treated u −,s (0), being independent of u +,s (0), as a fundamental building block to construct the composite hadrons. Possible physical origin of ρ 3 = −1 component is discussed in Ref. 7). * * ) The COQM have been successfully applied to various (static and non-static) problem of hadrons for many years. As relatively recent application, for example, see Ref. 8) and references therein.

show abstract

“…Within this context, we have proposed a new level-classification scheme, 8), 9) which has a relativistically covariant framework and is in conformity with the approximate chiral symmetry. In this new classification scheme, the "chiral states", which are not included within the framework of the NRQM, are expected to exist in the lower mass region, and the σ-nonet is naturally assigned as the (qq) relativistic S-wave chiral state.…”

Section: §1 Introductionmentioning

confidence: 99%

Indications for the Existence of Chiral Particles: the Axial-Vector D1 and the Scalar B0

Ito

Ishida

et al. 2002

Progress of Theoretical Physics

View full text Add to dashboard Cite

In a 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 pseudoscalar and vector mesons, respectively, were predicted in D and B meson systems, realizing a linear representation of chiral symmetry concerning the light quark. In this work we reanalyze the D * π mass spectra obtained through Υ (4S) and Z 0 decay and the Bπ spectra obtained through Z 0 decay to show the possibility of the existence of D χ 1 and B χ 0 , respectively. * ) Preliminary results from the analysis of D χ 1 were reported at the conference Hadron 2001 at

show abstract

a new symmetry possibly realizing in hadron spectroscopy

Cited by 11 publications

References 37 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Strong Decays of sc Mesons in the Covariant Oscillator Quark Model with the \widetildeU(4)DS ×O(3,1)L-Classification Scheme

Indications for the Existence of Chiral Particles: the Axial-Vector D1 and the Scalar B0

Contact Info

Product

Resources

About