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  • 标题:Anisotropic lattice QCD study of pentaquark baryons in spin 3/2 channel
  • 本地全文:下载
  • 作者:T. Doi ; N. Ishii ; Y. Nemoto
  • 期刊名称:PoS - Proceedings of Science
  • 印刷版ISSN:1824-8039
  • 出版年度:2005
  • 卷号:2005
  • 出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
  • 摘要:We perform the comprehensive analysis of the pentaquark (5Q) in JP = 3/2± channel using anisotropic quenched lattice QCD. We employ the standard Wilson gauge action at b = 5.75 and the O(a) improved Wilson (clover) quark action on a 123×96 lattice with the renormalized anisotropy as as/at = 4. A large number of gauge configurations as Nconf = 1000 is analyzed, which is found to be essential to achieve a reliable measurement. We study three types of the Rarita-Schwinger intepolationg fields with I = 0: (a) the NK∗-type, (b) the (color-)twisted NK∗- type, (c) a diquark-type. As a result, we find only massive states as m5Q ≃ 2.1−2.2 GeV in JP = 3/2− channel, and m5Q = 2.4−2.6 GeV in JP = 3/2+ channel in the chiral limit. The analysis with the hybrid boundary condition (HBC) is performed to distinguish whether these resonances are compact 5Q resonances or two-particle scattering states. No low-lying compact 5Q resonance states are found below 2.1GeV.
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