Pentaquark and diquark-diquark clustering: a QCD sum rule approach
نویسنده
چکیده
In this work we study the Θ+(1540) in the framework of QCD sum rules based on (ud)2s̄ diquark clustering as suggested by Jaffe and Wilczek. Within errors, the mass of the pentaquark is compatible with the experimentally measured value. The mass difference between the Θ+ and the pentaquark with the quantum numbers of the nucleon amounts to 70 MeV, consistent with the interpretation of the N(1440) as a pentaquark.
منابع مشابه
Magnetic moment of the pentaquark Θ(1540) with light-cone QCD sum rules
In this article, we study the magnetic moment of the pentaquark state Θ+(1540) as diquark-diquark-antiquark ([ud][ud]s̄) state in the framework of the light-cone QCD sum rules approach. The numerical results indicate the magnetic moment of the pentaquark state Θ+(1540) is about μΘ+ = −(0.49± 0.06)μN . PACS : 12.38.Aw, 12.38.Lg, 12.39.Ba, 12.39.-x
متن کاملReanalysis the pentaquark Θ(1540) in the framework of QCD sum rules approach with direct instantons
In this article, we study the pentaquark state Θ+(1540) with a (scalar)diquark(pseudoscalar)diquark-antiquark type interpolating current in the framework of the QCD sum rules approach by including the contributions from the direct instantons. The numerical results indicate that the contributions from the direct instantons are very small and can be safely neglected. PACS : 12.38.Aw, 12.38.Lg, 12...
متن کاملMagnetic moment of the pentaquark Θ(1540) as diquark-diquark-antiquark state with QCD sum rules
In this article, we study the magnetic moment of the pentaquark state Θ+(1540) as diquark-diquark-antiquark ([ud][ud]s̄) state with the QCD sum rules in the external weak electromagnetic field (EFSR) and the light-cone QCD sum rules (LCSR) respectively. The numerical results indicate the magnetic moment is about μΘ+ = −(0.11 ± 0.02)μN for the EFSR and μΘ+ ≈ −(0.1−0.5)μN for the LCSR. As the valu...
متن کاملar X iv : h ep - p h / 05 04 27 3 v 1 2 8 A pr 2 00 5 Magnetic moment of the pentaquark state Θ + ( 1540 )
In this article, we study the magnetic moment of the pentaquark Θ(1540) as diquark-diquark-antiquark state with the QCD sum rules approach in the external electromagnetic field. Due to the special structure of the interpolating current, only the interactions of the s quark with the external electromagnetic field have contributions to the tensor structure σμν p̂+ p̂σμν . The numerical results indi...
متن کاملar X iv : h ep - p h / 05 04 27 3 v 2 1 2 Ju l 2 00 5 Magnetic moment of the pentaquark state Θ + ( 1540 )
In this article, we study the magnetic moment of the pentaquark Θ(1540) as (scalar)diquark-(pseudoscalar)diquark-antiquark state with the QCD sum rules approach in the external electromagnetic field. Due to the special structure of the interpolating current, only the electromagnetic interactions of the s quark with the external field have contributions to the magnetic moment with tensor structu...
متن کامل