A minimal dynamical scheme for "understanding" hadronic widths

Mitra, A. N. ; Sharma, Anju (1997) A minimal dynamical scheme for "understanding" hadronic widths Fortschritte der Physik/Progress of Physics, 45 (5). pp. 411-434. ISSN 0015-8208

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/prop.21...

Related URL: http://dx.doi.org/10.1002/prop.2190450504


Using a quark model scheme of 'least Dynamics', an inclusive determination of the total widths of mesons and baryons is proposed via the following mechanism: There exists a short (breathing) mode for the temporary dissociation of a hadron into a pair of "qausi-free" quarks and/or diquarks which eventually hadronize with certainty, so that the requisite widths correspond to this "first stage" dissociation itself. A detailed model (described elsewhere) based on the momentum dependence of the quark's mass function m(p) suggests a significant mass reduction of these quasi-free quarks w.r.t their "constituent" values m(O). Using this logic, a phenomenological coupling scheme for the meson-(quasifree)quark-vertex function is derived from Schwinger's Partial (broken chiral). Symmetry which incorporates the conservation of isospin, baryonic charge and hypercharge with respective 'gauge mesons' rho, omega, phi. A very similar structure is found for baryon couplings to quark (q)-diquark (D) pairs, with the same overall coupling constant (gs) for both systems. Its tentative identification with the QCD value yields a surprisingly good pattern of agreement with data for both hadron types, using two "quasi-free" masses (mud and ms) as inputs, with the corresponding diquark masses determined additively.

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