Abstract
Numerous experimental and theoretical arguments in favor of the intermediate dibaryon generation in NN and 3N interactions are presented. Using some specific mechanism for the scalar field production when the 2ħω -excited multi-quark system deexcites to the ground state one formulates a concept for σ-dressed dibaryon as a carrier of intermediate-range attraction and a reason for short-range repulsion in NN -interaction. It is argued that the basic mechanisms responsible for large lowering of the Roper-resonance and the dressed dibaryon masses should be very similar. The modern experimental data of a few groups seem to confirm strongly the dibaryon picture in NN and 3N -interactions. Some important common features of the dibaryon and pomeron in highenergy NN scattering are discussed.
Highlights
General idea of dibaryons, or six-quarks bags, is almost as old as idea of quarks [1,2]
The most important consequence of such scalar meson renormalization in NN and 3N systems is a reduction of dressed dibaryon mass and related to this the strengthening of the NN attraction at intermediate distances rNN ∼ 0.8 − 1 fm induced by this dressed dibaryon. From this point of view, one can say that the origin of the observed strong NN attraction at intermediate distances is due to the the strong chiral symmetry restoration effects in the 2 ω-excited six-quark system
From numerous experimental data and recent theoretical studies one can expect that the σ-meson mass in the Roper resonance and in the 2 ω-excited dibaryon should be renormalized. Such a renormalization for the σ-meson mass and width plays the key role in the Roper and dibaryon dynamics and in the properties of the dense nuclear matter [41]. This chiral symmetry restoration (CSR) effects makes the Roper and dibaryon masses lower and – in dibaryon case – it enhances noticeably the effective NN attraction at intermediate distances which is induced by the intermediate dibaryon generation
Summary
Six-quarks bags, is almost as old as idea of quarks [1,2]. Due to some specific structure of multiquark wavefunctions in color, spin and flavor spaces in S U(6) scheme and specific quark-quark interaction via OGE it might be possible that the dibaryon mass in some channels would be less or near to initial two-baryon mass. Still the most probable candidate for such non-strange dibaryon was JπI = 3+0 dibaryon in ∆∆ channel near ∆∆ threshold [8] In all these previous studies the dibaryons were considered as some exotic multiquark mode, like pentaquark. The σ-dressed dibaryon model just leads to such a strong additional attraction – through the s-channel intermediate dibaryon production – the effect which is absent in one nucleon This fact gives a very good argument in favor of such a dibaryon picture for NN interaction
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