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arXiv · hep-ph/9901439

Is there diquark clustering in the nucleon?

L. Ya. Glozman·K. Varga
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Abstract

It is shown that the instanton-induced interaction in qq pairs, iterated in t-channel, leads to a meson-exchange interactions between quarks. In this way one can achieve a simultaneous understanding of low-lying mesons, baryons and the nuclear force. The discussion is general and does not necessarily rely on the instanton-induced interaction. Any nonperturbative gluonic interaction between quarks, which is a source of the dynamical chiral symmetry breaking and explains the $π$ - $ρ$ mass splitting, will imply an effective meson exchange picture in baryons. Due to the (anti)screening there is a big difference between the initial 't Hooft interaction and the effective meson-exchange interaction. It is demonstrated that the effective meson-exchange interaction, adjusted to the baryon spectrum, does not bind the scalar diquark and does not induce any significant quark-diquark clustering in the nucleon because of the nontrivial role played by the Pauli principle.

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L. Ya. Glozman, K. Varga. 1999-10-05. Is there diquark clustering in the nucleon?. https://doi.org/10.1103/physrevd.61.074008

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