Bose-Einstein correlations and ${\mathbf{v}}_{\mathbf{2}\mathbf{n}}$ and ${\mathbf{v}}_{\mathbf{2}\mathbf{n}-\mathbf{1}}$ in hadron and nucleus collisions

We show that Bose-Einstein correlations of identical particles in hadron and nucleus high energy collisions, lead to long range rapidity correlations in the azimuthal angle. These correlations are inherent features of the CGC/saturation approach, however, their origin is more general than this approach. In framework of the proposed technique both even and odd $v_n$ occur naturally, independent of the type of target and projectile. We are of the opinion that it is premature to conclude that the appearance of azimuthal correlations are due to the hydrodynamical behaviour of the quark-gluon plasma.