Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider
Heikki Mäntysaari, Niklas Mueller, Farid Salazar, Björn Schenke
Abstract
We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the color glass condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum $\mathbit{P}$ and recoil momentum $\mathbf{\ensuremath{\Delta}}$, as well as the anisotropy in the relative angle between $\mathbit{P}$ and $\mathbf{\ensuremath{\Delta}}$. Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that $|\mathbit{P}|\ensuremath{\gg}|\mathbf{\ensuremath{\Delta}}|$. We validate this approximation in its range of applicability and quantify its failure for $|\mathbit{P}|\ensuremath{\lesssim}|\mathbf{\ensuremath{\Delta}}|$. We also predict significant target-dependent deviations from the correlation limit approximation for $|\mathbit{P}|>|\mathbf{\ensuremath{\Delta}}|$ and $|\mathbit{P}|\ensuremath{\lesssim}{Q}_{s}$, which offers a straightforward test of gluon saturation and access to multigluon distributions at a future Electron-Ion Collider.