Effective Masses of Pentaquark Θ+ in Nuclear Matter

  • The properties of baryons in nuclear matter are analysed in the relativistic mean-field theory(RMF). It is found that the scalar field σ meson affects the properties of baryon at high density. A density dependent scalar coupling gσN is determined according to the idea of quark-meson coupling model and extended to RMF. It is shown that gσN affects the property of nuclear matter weakly at low density, but strongly at high density. The relation between the scalar density ρS and the nuclear density ρ and the effective mass of the pentaquark Θ+ are studied with the density dependent coupling constant. The density dependent scalar coupling obviously affects the effective masses of baryons in nuclear matter, especially at high density.
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GUO Yan-Rui, LI Xi-Guo, ZHONG Xian-Hui, LIU Zi-Yu and JIN Gen-Ming. Effective Masses of Pentaquark Θ+ in Nuclear Matter[J]. Chinese Physics C, 2007, 31(8): 724-730.
GUO Yan-Rui, LI Xi-Guo, ZHONG Xian-Hui, LIU Zi-Yu and JIN Gen-Ming. Effective Masses of Pentaquark Θ+ in Nuclear Matter[J]. Chinese Physics C, 2007, 31(8): 724-730. shu
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Received: 2006-11-07
Revised: 2007-03-12
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Effective Masses of Pentaquark Θ+ in Nuclear Matter

    Corresponding author: GUO Yan-Rui,
  • Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China4 Department of Physics, Nankai University, Tianjin 300071, China

Abstract: The properties of baryons in nuclear matter are analysed in the relativistic mean-field theory(RMF). It is found that the scalar field σ meson affects the properties of baryon at high density. A density dependent scalar coupling gσN is determined according to the idea of quark-meson coupling model and extended to RMF. It is shown that gσN affects the property of nuclear matter weakly at low density, but strongly at high density. The relation between the scalar density ρS and the nuclear density ρ and the effective mass of the pentaquark Θ+ are studied with the density dependent coupling constant. The density dependent scalar coupling obviously affects the effective masses of baryons in nuclear matter, especially at high density.

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