Complex rational Ruijsenaars model. The two-particle case

N. M. Belousov, G. A. Sarkissian, V. P. Spiridonov

We consider a complex rational degeneration of the hyperbolic Ruijsenaars model emerging in the limit $\ddot{I}{‰}_1+\ddot{I}{‰}_2\to 0$ (or $b\to ı$ in $2d$ CFT) and investigate in detail the…