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We study the production of forward di-jets in proton-lead and proton-protoncollisions at the Large Hadron Collider. Such configurations, with both jetsproduced in the forward direction, impose a dilute-dense asymmetry which allowsto probe the gluon density of the lead or proton target at small longitudinalmomentum fractions. Even though the jet momenta are always much bigger than thesaturation scale of the target, $Q_s$, the transverse momentum imbalance of thedi-jet system may be either also much larger than $Q_s$, or of the order $Q_s$,implying that the small-$x$ QCD dynamics involved is either linear ornon-linear, respectively. The small-$x$ improved TMD factorization frameworkdeals with both situation in the same formalism. In the latter case, whichcorresponds to nearly back-to-back jets, we find that saturation effects inducea significant suppression of the forward di-jet azimuthal correlations inproton-lead versus proton-proton collisions.

Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework