The boson mass and the condensate in two dimensional QCD with SU(Nc) colors are numerically evaluated with the Bogoliubov vacuum. It is found that the boson mass is finite at the massless limit, and it is well described by the phenomenological expression MNc = 2 3 √ Ncg 3π for large Nc. Also, the condensate values agree very well with the prediction by the 1/Nc expansion. The validity of the na...

A bstract We study a renormalizable theory that includes heavy weak-singlet vectorlike lepton, τ ′ , decays into pseudoscalar boson and tau lepton. show this can be the dominant decay mode of provided couplings deviate from case Nambu-Goldstone boson. For range parameters, is long-lived, mainly photon pair at one loop, or tree level. Electroweak production + ′− leads to rich phenomenology colli...

The chiral symmetry is applied to an extended constituent quark potential model. With random phase approximation (RPA), a small component effect is added to the constituent quark model. To obtain the pseudoscalar π meson as a Goldstone boson, the quark effective potentials are modified in the model to account for the dynamical breaking of chiral symmetry. Also the vector ρ meson is calculated a...

In the first part we summarize the status of the nucleon-nucleon (NN) problem in the context of Hamiltonian based constituent quark models and present results for the ℓ = 0 phase shifts obtained from the Goldstone-boson exchange model by applying the resonating group method. The second part deals with the construction of local shallow and deep equivalent potentials based on a Superymmetric Quan...

The constituent quark model can explain the strong selectivity of the Nη decay branching ratios of the nucleon resonances if the fine structure interaction between the constituent quarks is described in terms of Goldstone boson exchange. This chiral quark model predicts that the S wavefunctions in lowest order, should have large Nη branching ratios, while Nη decay of the other resonances that h...

We discuss certain general features of the pentaquark picture for the θ, its 10F partner, Ξ3/2, and possible heavy quark analogues. Models employing spin-dependent interactions based on either effective Goldstone boson exchange or effective color magnetic exchange are also used to shed light on possible corrections to the Jaffe-Wilczek and KarlinerLipkin scenarios. Some model-dependent features...

We study the generation of vector meson masses in the Hidden Local Symmetry (HLS) model of low energy QCD. After demoting the HLS to a hidden global symmetry (HGS), the ρ is explicitly shown to be massless for any value of the HS parameter a and the chiral partner of the pion appears as the Goldstone boson associated with the spontaneous breaking of the HGS, closely resembling the predictions o...

A model of the ρ-meson as a collective excitation of q ¯ q pairs in a system that obeys the modified Nambu–Jona-Lasinio Lagrangian is proposed. The ρ emerges as a dormant Goldstone boson. The origin of the ρ-meson mass is understood as a result of spontaneous chiral symmetry breaking. The low-energy dynamics of ρ, π, ω and γ is consistently described in this new framework. The model accounts fo...

We present arguments in favor of the idea that supersymmetric sigma models with compact symmetric Kähler spaces as target manifolds have a second-order phase transition in four dimensions. When applied to electroweak symmetry breaking, these models then do not require a light Higgs boson or techni-resonances but predict fermionic superpartners of longitudinal W's and Z with masses at or below T...

Baryon number is an accidental symmetry in the standard model, while Peccei-Quinn hypothetical which introduced to solve strong $CP$ problem. We study possible connections between and baryon symmetry. In this framework, axion identified as Nambu-Goldstone boson of violation. As a result, characteristic violating processes are predicted. developed general method determine lepton new scalar model.