Triquark correlations and pentaquarks in a QCD sum rule approach

Details Triquark correlations and pentaquarks in a QCD sum rule approach Triquark correlations and pentaquarks in a QCD sum rule approach

2004-12-09

arxiv.org/abs/hep-ph/0412127v4

Phys.Lett. B610 (2005) 50-60

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 9 figures, corrected typos, reference added, introduction and conclusions modified slightly

Scientific paper

10.1016/j.physletb.2005.01.081

The role of quark correlations in the description of hadron dynamics in many domains of physics, from low energy dynamics to very hot(dense) systems, is being appreciated. Strong correlations of two quarks (diquark) have been widely investigated in this respect. Recently, we have proposed a dynamical scheme to describe the $\Theta^+$ pentaquark in which also three quark correlations (triquark) were instrumental in producing a low mass exotic state. We perform a study, within the QCD sum rule approach including OPE and direct instanton contributions, of triquark correlations and obtain two quasi-bound light $ud\bar{s}$ color quark clusters of 800 MeV and 930 MeV respectively.

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