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

Martin Hentschinski; Christophe Royon; Marco Alcazar Peredo; Cristian Baldenegro; Andrea Bellora; Renaud Boussarie; Francesco Giovanni Celiberto; Salim Cerci; Grigorios Chachamis; J. G. Contreras; Sylvain Fichet; Michael Fucilla; Gero von Gersdorff; Pablo González; Andreas van Hameren; Jamal Jalilian-Marian; Mats Kampshoff; Valery Khoze; Michael Klasen; Spencer Robert Klein; Georgios Krintiras; Piotr Kotko; Krzysztof Kutak; Jean-Philippe Lansberg; Emilie Li; Constanin Loizides; Mohammed M. A. Mohammed; Maxim Nefedov; Melih A. Ozcelik; Alessandro Papa; Michael Pitt; Agustin Sabio Vera; Jens Salomon; Sebastian Sapeta; Gustavo Gil da Silveira; Victor Paulo Gonçalves; Mark Strikman; Deniz Sunar Cerci; Lech Szymanowski; Daniel Tapia Takaki; Marek Taševský; Samuel Wallon

Paper

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