\documentclass{standalone}

\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
\filldraw [blue, fill=blue!15, thin,  even odd rule] (0,0) ellipse (5 and 3)  (0,0) ellipse (4.7 and 2.7);
\draw[<->] (0,2.7)--(0,3);
\node at (.15,2.85) {$\varepsilon$};

\node at (3,2.7) {$\Sigma^+$};
\node at (2.4,2.1) {$\Sigma^-$};

\end{tikzpicture}
\end{document}
