Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-02-14
Acta Phys.Polon. B30 (1999) 287-348
Physics
High Energy Physics
High Energy Physics - Phenomenology
59 pages LaTex, 42 postscript file figures
Scientific paper
In a dilute system of instantons and antiinstantons, the U$_{\rm A}$(1) and scale anomalies are shown to be directly related to the bulk susceptibility and compressibility of the system. Using $1/N_c$ (where $N_c$ is the number of colors) as a book-keeping argument, mesonic, baryonic and gluonic correlators are worked out in p-space and Fourier transformed to x-space for a comparison with recently simulated correlators. The results are in overall agreement with simulations and lattice calculations, for distances up to 1.5 fm, despite the fact that some channels lack the necessary physical singularities. We analyze various space-like form factors of the nucleon and show that they are amenable to constituent quark form factors to leading order in $1/N_c$. Issues related to the lack of confinement in the model and its consequence on the various correlation functions and form factors are also discussed.
Kacir M.
Prakash Madappa
Zahed Ismail
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