JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model

ZHANG Ao; LIU Yan-Rui; HUANG Peng-Zhi; DENG Wei-Zhen; CHEN Xiao-Lin; ZHU Shi-Lin

Chinese Physics C> 2005, Vol. 29> Issue(3) : 250-257

JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model

Department of Physics,Peking University,Beijing 100871,China2 Department of Physics,National Taiwan University,Taipei 106,China

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If Jaffe and Wilczek's diquark picture for Θ5+ pentaquark is correct, there should also exist a SU^F(3) pentaquark octet and singlet with no orbital excitation between the diquark pair, hence JP=12-.These states are lighter than the Θ5+ anti-decuplet and lie close to the orbitally excited (L=1) three-quark states in the conventional quark model.We calculate their masses and magnetic moments and discuss their possible strong decays using the chiral Lagrangian formalism. Among them two pentaquarks with nucleon quantum numbers may be narrow. Selection rules of strong decays are derived. We propose the experimental search of these nine additional JP=12- baryon states. Especially there are two additional JP=12- Λ baryons around Λ(1405).We also discuss the interesting possibility of interpreting Λ(1405) as a pentaquark.The presence of these additional states will provide strong support of the diquark picture for the pentaquarks. If future experimental searches fail, one has to re-evaluate the relevance of this picture for the pentaquarks.

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ZHANG Ao, LIU Yan-Rui, HUANG Peng-Zhi, DENG Wei-Zhen, CHEN Xiao-Lin and ZHU Shi-Lin. JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model[J]. Chinese Physics C, 2005, 29(3): 250-257.

ZHANG Ao, LIU Yan-Rui, HUANG Peng-Zhi, DENG Wei-Zhen, CHEN Xiao-Lin and ZHU Shi-Lin. JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model[J]. Chinese Physics C, 2005, 29(3): 250-257. shu

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Received: 2004-09-15
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JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model

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JP=21－Pentaquarks in Jaffe and Wilczek's Diquark Model

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