Multiquark states

Abstract

The pentaquark state recently discovered has been discussed based on various quark model calculations. Odd parity for the state can not be ruled out theoretically because contributions related to non-trivial color structures have not been studied completely. Other multiquark states, especially dibaryons, have been discussed also. A strangeness -3 NΩ dibaryon has been shown to have a width as small as 12-22 keV and should be detectable in Ω high productivity reactions such as at RHIC, COMPAS and the planned JHF and FAIR projects.

Productions of hadrons, pentaquarksΘ+andΘ*++, and di-baryonShao1, Xie2, Wang3 2005Phys. Rev. C

“…The last exotic state we are going to look at is the di-baryon (ΩΩ) 0 + . For more than 20 years the search for di-baryon has been another important attempt in hadronic physics [69,70,71,72,73,74]. One believes that if di-baryons do exist those with multi-strangeness must be ideal candidates to be observed because of their relatively long lifetime due to the stability with respect to strong decay.…”

Symmetries in subatomic multi-quark systems

“…Such systems have been examined from the point of view of symmetries a long time ago, see, e.g., [13][14][15] See also. [16][17][18] The symmetries that were found useful were the combined spin color symmetry SU cs (6) the orbital symmetry and the flavor symmetry. Such multiquarks were later discovered experimentally, the penta-quark 19,20 and the tetraquark.…”

Symmetries in subatomic six-quark fermions

“…The first calculations 1,2 of such systems employed the Jaffe version 3,4 of the MIT bag model. Hints of such multi-quarks have since been seen observed experimentally, the penta-quark [5][6][7][8] and the tetra-quark. 9,10 For the latter see also the recent reviews.…”