White Paper on Forward Physics, BFKL, Saturation Physics and Diffraction

The goal of this whitepaper is to give a comprehensive overview the rich field forward physics. We discuss occurrences BFKL resummation effects in special final states, such as Mueller-Navelet jets, jet gap and heavy quarkonium production. It further addresses TMD factorization at low x manifestation semi-hard saturation scale (generalized) PDFs. More theoretical aspects physics, probes quark gluon plasma, well possibility use photon-hadron collisions LHC constrain hadronic structure x, resulting complementarity between EIC are also presented. briefly diffraction colliders explore electroweak theory central exclusive events using photon-photon collider.