Forward dijet production and improved TMD factorization in dilute-dense hadronic collisions

We study inclusive dijet production at small x in hadronic collisions. We extend the High Energy Factorization (HEF) framework outside its kinematic window, where the transverse momentum imbalance of the dijets system is comparable to the transverse momenta of the individual jets, to the case of arbitrarily small transverse momentum imbalance. That involves generalizing the Transverse Momentum Dependent (TMD) factorization formula for dijet production to the case of finite Nc and with one of the incoming gluons being off-shell. We discuss the features of this new generalized TMD factorization and relate it to the colour-ordered amplitude formalism