  At leading-order, the standard dilute-dense Color Glass Condensate formula
used for two-particle correlations in proton-nucleus collisions, whose
symmetries prevent the generation of odd azimuthal anisotropy harmonics, is the
dilute projectile limit of the dense-dense formalism. However, when the
projectile is genuinely dilute, the complete formulation contains additional
contributions at the same leading order in the strong coupling constant. In
this work we investigate those low projectile density contributions that are
relevant when the particles are produced at forward rapidities. We find that
they are responsible for non-zero odd harmonics which are negative, in
qualitative agreement with recent experimental measurements at the Relativistic
Heavy-Ion Collider.
