  We show that, in the saturation/Color Glass Condensate framework, odd
azimuthal harmonics of the two-gluon correlation function with a long-range
separation in rapidity are generated by the higher-order saturation corrections
in the interactions with the projectile and the target. At the very least, the
odd harmonics require three scatterings in the projectile and three scatterings
in the target. We derive the leading-order expression for the two-gluon
production cross section which generates odd harmonics: the expression includes
all-order interactions with the target and three interactions with the
projectile. We evaluate the obtained expression both analytically and
numerically, confirming that the odd-harmonics contribution to the two-gluon
production in the saturation framework is non-zero.
