Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}

Takeuchi, Sachiko; Shimizu, Kiyotaka

doi:10.1103/PhysRevC.71.062202

Title: Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}

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Abstract

We have investigated negative-parity uudds pentaquarks by employing a quark model with the meson exchange and the effective gluon exchange as qq and qq interactions. The system of five quarks is dynamically solved; the qq and qq correlations are taken into account in the wave function. The masses of the pentaquarks are found to be reasonably low. It is found that the lowest-mass state is TJ{sup P}=0(1/2){sup -} and the next lowest one is 0(3/2){sup -}. The former is reported to have a large width. We argue that the observed narrow peak corresponds to the latter state. It is still necessary to introduce an extra attraction to reduce the mass further by 140-280 MeV to reproduce the observed {theta}{sup +} mass. Since their level splitting is less than 80 MeV, the lower level will not become a bound state below the NK threshold even after such an attraction is introduced. It is also found that the relative distance of two quarks with the attractive interaction is found to be by about 1.2-1.3 times closer than that of the repulsive one. The two-body correlation seems important in the pentaquark systems.

Authors:

Takeuchi, Sachiko; Shimizu, Kiyotaka ^[1]

Japan College of Social Work, Kiyose, Tokyo 204-8555 (Japan)

Publication Date:: Wed Jun 01 00:00:00 EDT 2005

OSTI Identifier:: 20698723

Resource Type:: Journal Article

Journal Name:: Physical Review. C, Nuclear Physics

Additional Journal Information:: Journal Volume: 71; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.71.062202; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BAG MODEL; BOSON-EXCHANGE MODELS; BOUND STATE; CORRELATIONS; GLUONS; HYPERONS; K*-892 MESONS; MASS FORMULAE; MEV RANGE; NUCLEONS; PARITY; PARTICLE IDENTIFICATION; PARTICLE WIDTHS; QUARKS; REST MASS; TWO-BODY PROBLEM; WAVE FUNCTIONS

Citation Formats


                    Takeuchi, Sachiko, Shimizu, Kiyotaka, and Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554. Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}.  United States: N. p., 2005. 
        Web.  doi:10.1103/PhysRevC.71.062202.

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                    Takeuchi, Sachiko, Shimizu, Kiyotaka, & Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554. Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}.  United States.  https://doi.org/10.1103/PhysRevC.71.062202

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                    Takeuchi, Sachiko, Shimizu, Kiyotaka, and Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554. 2005.  
        "Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}".  United States.  https://doi.org/10.1103/PhysRevC.71.062202.

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@article{osti_20698723,

  title        = {Pentaquark as a NK* bound state with TJ{sup P}=0(3/2){sup -}},

  author       = {Takeuchi, Sachiko and Shimizu, Kiyotaka and Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554},

  abstractNote = {We have investigated negative-parity uudds pentaquarks by employing a quark model with the meson exchange and the effective gluon exchange as qq and qq interactions. The system of five quarks is dynamically solved; the qq and qq correlations are taken into account in the wave function. The masses of the pentaquarks are found to be reasonably low. It is found that the lowest-mass state is TJ{sup P}=0(1/2){sup -} and the next lowest one is 0(3/2){sup -}. The former is reported to have a large width. We argue that the observed narrow peak corresponds to the latter state. It is still necessary to introduce an extra attraction to reduce the mass further by 140-280 MeV to reproduce the observed {theta}{sup +} mass. Since their level splitting is less than 80 MeV, the lower level will not become a bound state below the NK threshold even after such an attraction is introduced. It is also found that the relative distance of two quarks with the attractive interaction is found to be by about 1.2-1.3 times closer than that of the repulsive one. The two-body correlation seems important in the pentaquark systems.},

  doi          = {10.1103/PhysRevC.71.062202},

  url          = {https://www.osti.gov/biblio/20698723},
  journal      = {Physical Review. C, Nuclear Physics},

  issn         = {0556-2813},

  number       = 6,

  volume       = 71,

  place        = {United States},

  year         = {Wed Jun 01 00:00:00 EDT 2005},

  month        = {Wed Jun 01 00:00:00 EDT 2005}

}

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