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Chinese Physics C> 2007, Vol. 31> Issue(1) : 48-51 

Effect of Pentaquark Θ+ on the Equation of State of Nuclear Matter

  •  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

  • Assuming Θ+ interacts with nucleon or Θ+ by exchanging isoscalar mesons σ and ω, the equation of state of {p,n,Θ+} and possible metastable state are studied in the framwork of the density dependent relativistic hadron field theory(DDRH). The ratio of the proton isospin to the neutron isospin with different baryon densities and the effect of the Θ+ component on the binding energy per baryon of the system are also discussed. It is shown that when the binding energy per baryon of the system takes the maximal value, Θ+ might be bound in the nuclear matter.
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    [1] . Schaffer J, Dover C B, Gal A et al. Phys. Rev. Lett.,1993,71: 13282. Schaffer J, Dover C B, Gal A et al. Ann. Phys., 1994, 235:353. GUO Hua, YANG Shu, HU Xiang et al. Chin. Phys., 2001,10: 8054. Diakonov D, Petrov V, Polyakov M V. Z. Phys., 1997,A359(3): 3055. GAO Hai-Yan, MA Bo-Qiang. Mod. Phys. Lett., 1999,A14: 23136. Nakano T et al. Phys. Rev. Lett., 2003, 91: 0120027. Barmin V V, Borisov V S, Davidenko G V et al. Phys.Atom. Nucl., 2003, 66: 17158. Stepanyan S et al. Phys. Rev. Lett., 2003, 91: 2520019. Airapetian A et al. Phys. Lett., 2004, B585: 21310. Asratyan A E, Dolgolenko A G, Kubantsev M A. Phys.Atom. Nucl., 2004, 67: 68211. ZHU Shi-Lin. Int. J. Mod. Phys., 2004, A19: 343912. Michael Danilov. hep-ex/050901213. ZOU Bing-Song, Riska D O. Phys. Rev. Lett., 2005, 95:07200114. Brockmann R, Toki H. Phys. Rev. Lett., 1992, 68: 340815. Hofmann F, Keil C M, Lenske H. Phys. Rev., 2001, C64:03431416. LI Xi-Guo, GAO Yuan, LIU Zi-Yu. HEP NP, 2004,28(11): 1150(in Chinese)(李希国, 高远, 刘紫玉. 高能物理与核物理, 2004, 28(11):1150)17. GAO Yuan, LI Xi-Guo, LI Yong-Qing. HEP NP, 2005,29(11): 1067(in Chinese)(高远, 李希国, 李永青. 高能物理与核物理, 2005, 29(11):1067)18. Walecka J D. Ann. Phys., (N.Y.) 1974, 83: 49119. Serot B D, Walecka J D. Adv. Nucl. Phys., 1986, 16: 120. Serot B D, Walecka J D. Int. J. Mod. Phys., 1997, E6: 51521. GAO Yuan, LI Xi-Guo, JIA Duo-Jie. HEP NP, 2003,27(11): 995(in Chinese)(高远, 李希国, 贾多杰. 高能物理与核物理, 2003, 27(11):995)22. LI Xi-Guo, GAO Yuan. HEP NP, 2004, 28(9): 973(in Chinese)(李希国, 高远. 高能物理与核物理, 2004, 28(9): 973)23. Pierre A M, Guichon, Koichi Saito et al. Nucl. Phys., 1996,A601: 34924. ZHONG X H, TAN Y H, LI L et al. nucl-th/0408046

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GAO Yuan, LI Xi-Guo and LI Yong-Qing. Effect of Pentaquark Θ+ on the Equation of State of Nuclear Matter[J]. Chinese Physics C, 2007, 31(1): 48-51.
GAO Yuan, LI Xi-Guo and LI Yong-Qing. Effect of Pentaquark Θ+ on the Equation of State of Nuclear Matter[J]. Chinese Physics C, 2007, 31(1): 48-51. shu
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Received: 2005-12-15
Revised: 2006-08-09
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Effect of Pentaquark Θ+ on the Equation of State of Nuclear Matter

    Corresponding author: LI Xi-Guo,
  • Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2005-12-15
  • Accepted Date: 2006-08-09
  • Available Online: 2007-01-05

Abstract: Assuming Θ+ interacts with nucleon or Θ+ by exchanging isoscalar mesons σ and ω, the equation of state of {p,n,Θ+} and possible metastable state are studied in the framwork of the density dependent relativistic hadron field theory(DDRH). The ratio of the proton isospin to the neutron isospin with different baryon densities and the effect of the Θ+ component on the binding energy per baryon of the system are also discussed. It is shown that when the binding energy per baryon of the system takes the maximal value, Θ+ might be bound in the nuclear matter.

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