High Energy Physics - Phenomenology
[Submitted on 1 May 2005]
Title:Toward dynamical understanding of the diquarks, pentaquarks and dibaryons
View PDFAbstract: QCD instantons are known to produce deeply bound diquarks. We study whether it may be used as building blocks in the formation of multiquark states, in particular pentaquarks and dibaryons.
A simple model is presented in which the lowest scalar diquark (and possibly the tensor one) can be treated as an independent ``body'', with the same color and (approximately) the same mass as a constituent (anti)quark. In it a new symmetry exists between states with the same number of ``bodies'' but different number of quarks appear, in particular the 3-``body'' pentaquarks can be naturally related to some excited baryons. The limitations of this model are seen from the fact that it leads to light dibaryon $H$. Another reported work is based on a calculation of a large set of correlation functions for nonlocal operators with 4 to 6 light quarks in the Random Instanton Liquid Model (RILM).
The effective interaction between diquarks is studied and found to posses a strongly {\em repulsive core}, due to the Pauli principle for quark zero modes.
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