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

Abstract

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