Signature of accidental symmetry breaking in two-particle correlations within the CGC

Abstract

This work is devoted to the computation of the double inclusive gluon production cross section in a proton–nucleus collision within the framework of the Color Glass Condensate (CGC). Given the nature of the scattering, it is fitting to consider the dense-dilute particle production via going beyond the glasma graph approximation given its correspondence to the dilute–dilute limit of the CGC approach. More specifically, starting with the most general expression for the scattering amplitude of the process, not only we do re-obtain the piece encompassing the independent production of the two gluons from separate colour charge densities in the projectile wave function, but also we shed light on the picture encapsulating a correlation rooted in the incoming wave function. This procedure enables us to calculate the anisotropic second and third flow coefficients for both configurations, thereby revealing for the first time the odd azimuthal anisotropy harmonics at leading order in the eikonal expansion associated with the quantum correction embodying the original correlation, that is to say, a breaking of the accidental symmetry in the two-particle scenario.