Abstract:
The $1/N$ expansion is used to investigate the nonrelativistic model of
baryons proposed by Witten: $N$ quarks ($N\gg1$) of one flavor in the same
spin state bound by two-particle attractive forces determined by
a potential $V(r)$. The coordinate part of the wave function of the $N$ quarks
forming the bound state is represented in the form
$\psi(\mathbf{x}_1,\dots,\mathbf{x}_N)=
\prod\limits_{i=1}^N\varphi(\mathbf{x}_i)$.
The resulting integrodifferential spectral problem is solved by reduction
to nonlinear differential equations of higher order. The following potentials
are considered: 1) $V(r)=-g^2r^{-1}$, 2) $V(r)=g^2\alpha^2r$,
3) $V(r)=g^2(-r^{-1}+\alpha^2r)$. A computer was used to find the
characteristics of the corresponding baryon-like bound states of $N$ quarks.