The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons

doi:10.1063/1.2176532

Title: The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons

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Abstract

Several years ago we have proposed a manifestly covariant U-tilde(12)SF-classification scheme of hadrons, which maintains the successful SU(6)SF x O(3)L framework in Non-Relativistic Quark Model and is also reconcilable with the mechanism of Spontaneously-Broken Chiral Symmetry in Relativistic Field Theoretical Models. The essential point here is to notice the overlooked freedom of the SU(2){rho}-spin for (confined) light quarks, which leads to existence of new type of 'exotic' hadrons, called 'chiralons' and to a selection rule, {rho}3-line rule, on the spectator quark line.A series of puzzling new hadrons recently observed such as X(3872)-meson family and {theta}(1540) and so on are possibly classified mostly as chiralons.

Authors:

Ishida, Shin ^[1]

Research Institute of Science and Technology, College of Science and Technology, Nihon University, Tokyo 101-8308 (Japan)

Publication Date:: Sat Feb 11 00:00:00 EST 2006

OSTI Identifier:: 20798122

Resource Type:: Journal Article

Resource Relation:: Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176532; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CLASSIFICATION; D QUARKS; MESONS; PARTICLE IDENTIFICATION; QUARK MODEL; RELATIVISTIC RANGE; SELECTION RULES; SPIN; SU-2 GROUPS; SU-6 GROUPS; U QUARKS

Citation Formats


                    Ishida, Shin. The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons.  United States: N. p., 2006. 
        Web.  doi:10.1063/1.2176532.

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                    Ishida, Shin. The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons.  United States.  doi:10.1063/1.2176532.

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                    Ishida, Shin. Sat .  
        "The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons".  United States.  
        doi:10.1063/1.2176532.

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@article{osti_20798122,

  title        = {The U-tilde(12)-Classification Scheme, Static U(4)-Spin Symmetry for Light-Quarks and 'Exotic' Hadrons},

  author       = {Ishida, Shin},

  abstractNote = {Several years ago we have proposed a manifestly covariant U-tilde(12)SF-classification scheme of hadrons, which maintains the successful SU(6)SF x O(3)L framework in Non-Relativistic Quark Model and is also reconcilable with the mechanism of Spontaneously-Broken Chiral Symmetry in Relativistic Field Theoretical Models. The essential point here is to notice the overlooked freedom of the SU(2){rho}-spin for (confined) light quarks, which leads to existence of new type of 'exotic' hadrons, called 'chiralons' and to a selection rule, {rho}3-line rule, on the spectator quark line.A series of puzzling new hadrons recently observed such as X(3872)-meson family and {theta}(1540) and so on are possibly classified mostly as chiralons.},

  doi          = {10.1063/1.2176532},

  journal      = {AIP Conference Proceedings},

  number       = 1,

  volume       = 814,

  place        = {United States},

  year         = {Sat Feb 11 00:00:00 EST 2006},

  month        = {Sat Feb 11 00:00:00 EST 2006}

}

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DOI: 10.1063/1.2176532

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A Novel View of Exotic Hadrons and the Covariant U-tilde(12)-Classification Scheme

Yamada, Kenji - AIP Conference Proceedings

I classify exotic hadrons into two types, 'genuine' and 'hidden' exotics, and propose that the 'hidden' exotics would be interpreted as 'chiralons' in the U-tilde(12){sub SF}xO(3,1){sub L}-classification scheme of hadrons. Based upon this conjecture I investigate the mass spectrum of 1S, 1P, and 2S states for the cc-bar system by use of a phenomenological mass formula with the spin-dependent interactions and present possible assignments for exotic neutral charmonium-like states which were recently discovered. It is also mentioned that some J{sup PC}-exotic states predicted in this scheme might correspond to those found in a recent lattice QCD calculation of the charmoniummore » spectrum.« less
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Mass distributions of {pi}+{pi}-{pi}0 and {omega}{pi}0 systems obtained by several experiments are analyzed. We obtain indication of extra vector mesons {omega}(1250) and {rho}(1250) in lower mass region. Those state are expected to exist in the U-tilde(12)-classification scheme.
DOI: 10.1063/1.2176524
Radiative decays of ground-state qq-bar mesons in the U-tilde(12)-classification scheme of hadrons

Maeda, Tomohito ; Yamada, Kenji ; Oda, Masuho ; ... - AIP Conference Proceedings

The radiative transitions between ground-states of light qq-bar mesons are investigated in the U-tilde(12)-classification scheme. In this scheme the rich decay-spectra are offered even in transition between ground states due to the appearance of 'chiral states', out of the framework of non-relativistic quark model(NRQM) based on the SU(6)-symmetry, and it is shown that these states play an important role to improve our previous results, obtained without considering them.
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