A spontaneously broken quintet Baryon model for strong interactions

Abstract

A gauge type model of quantum field theory for strong interactions based on a quinted of observed fields, namely the proton, neutron, λ, λc and λb baryon fields is proposed. Gauging the resulting global symmetry groupK= SU(3)×1U(1)×2U(1)×3U(1) for matter fields, one obtains boson-fermion field theory with eleven gauge bosons. The analysis of admissible Higgs sector indicates that the Higgs multipleΦ consists of one adjoint and two fundamental representationsSU(3) and three scalar representations of1U(1),2U(1) and3U(1). The structure of the Higgs sector implies that the original symmetry group extends to the groupK×U(2). Breaking spontaneously the obtained field theory, one converts gauge bosons into the eleven massive vector bosons which can be identified with the observed ϱ, K*, ¯K*, Φ, Ω, J/ψ and Y vector mesons. The surviving global symmetry is isomorphic with the symmetry groupSU(2)×0U(1)× ×1U(1)×2U(1)×3U(1) corresponding to the isospin, strangeness, baryon number, charm and beauty conservation observed in strong interactions. The surviving Higgs scalars have the same quantum numbers as π, K, ¯K, η, S, δ, ɛ, χ and χb mesons. The model gives a newSU(3) classification scheme for baryons without charm and beauty in terms of triplets, sextets and 15-plets. These multiplets can be identified with the observed baryons; the scheme also includes the observed Z0 and Z1 baryons (the experimental evidence of which is, nevertheless, still weak). The model predicts the existence and the specific quantum numbers of new mesons and baryons with charm and beauty, and provides a very simple framework for the dibaryon analysis. Since all final physical fields are massive, this model is free from infrared divergences.