$J^P={1/2}^-$ Pentaquarks in Jaffe and Wilczek's Diquark Model

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dc.creatorZhang, A.
dc.creatorLiu, Y. -R.
dc.creatorHuang, P. -Z.
dc.creatorDeng, W. -Z.
dc.creatorChen, X. -L.
dc.creatorZhu, Shi-Lin
dc.date2004-03-19
dc.date2004-03-23
dc.date.accessioned2026-07-07T03:52:16Z
dc.date.available2026-07-07T03:52:16Z
dc.descriptionIf Jaffe and Wilczek's diquark picture for $Θ_5$ pentaquark is correct, there should also exist a $SU_F$(3) pentaquark octet and singlet with no orbital excitation between the diquark pair, hence $J^P={1/2}^-$. These states are lighter than the $Θ_5$ 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 $J^P={1/2}^-$ baryon states. Especially there are two additional $J^P={1/2}^-$ $Λ$ 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.
dc.identifierhttps://arxiv.org/abs/hep-ph/0403210
dc.identifierhttp://arxiv.org/abs/hep-ph/0403210
dc.identifierHigh Energy Phys.Nucl.Phys. 29 (2005) 250
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/43404
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Lattice
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.title$J^P={1/2}^-$ Pentaquarks in Jaffe and Wilczek's Diquark Model
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