A comparative study of pentaquark interpolating currents

In a diquark–diquark–antiquark picture of pentaquarks, we use two interpolating currents to calculate the mass of the recently measured Ξ−− state in the framework of QCD sum rules. We show that, even though yielding similar values for mΞ−− (and close to the experimental value), these currents differ...

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Bibliographic Details
Published inPhysics letters. B Vol. 602; no. 3-4; pp. 185 - 196
Main Authors Matheus, R.D., Navarra, F.S., Nielsen, M., Rodrigues da Silva, R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 25.11.2004
Elsevier Science
Subjects
Exact sciences and technology
Physics
The physics of elementary particles and fields
Continuum
Diquark
Antiquark
Operator product expansion
Sum rules
Pentaquark
Comparative study
Quantum chromodynamics
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Summary:In a diquark–diquark–antiquark picture of pentaquarks, we use two interpolating currents to calculate the mass of the recently measured Ξ−− state in the framework of QCD sum rules. We show that, even though yielding similar values for mΞ−− (and close to the experimental value), these currents differ from each other in what concerns the strength of the pole, convergence of the OPE and sensitivity to the continuum threshold parameter.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2004.09.072