title: QCD and strongly coupled gauge theories: challenges and perspectives.
abstract: We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.
authors.affiliation: Physik Department, Technische Universität München, James-Franck-Straße 1, 85748  Garching, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Brambilla
authors.affiliation: Budker Institute of Nuclear Physics, SB RAS, Novosibirsk , 630090 Russia ; Novosibirsk State University, Novosibirsk , 630090 Russia.
authors.forename: S
authors.initials: S
authors.lastname: Eidelman
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291  Darmstadt, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Foka
authors.affiliation: Department of Physics and Astronomy, University of Kentucky, Lexington, KY  40506-0055 USA.
authors.forename: S
authors.initials: S
authors.lastname: Gardner
authors.affiliation: Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL  60510-5011 USA.
authors.forename: A S
authors.initials: AS
authors.lastname: Kronfeld
authors.affiliation: Department of Physics, Washington University, St Louis, MO  63130 USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Alford
authors.affiliation: University of Graz, 8010  Graz, Austria.
authors.forename: R
authors.initials: R
authors.lastname: Alkofer
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090  Wien, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Butenschoen
authors.affiliation: Maryland Center for Fundamental Physics and Department of Physics, University of Maryland, College Park, MD  20742-4111 USA.
authors.forename: T D
authors.initials: TD
authors.lastname: Cohen
authors.affiliation: Max-Planck-Institute for Physics, Föhringer Ring 6, 80805  Munich, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Erdmenger
authors.affiliation: Excellence Cluster "Origin and Structure of the Universe", Technische Universität München, 85748  Garching, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Fabbietti
authors.affiliation: Atominstitut, Technische Universität Wien, 1040  Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Faber
authors.affiliation: Hampton University, Hampton, VA  23668 USA ; Jefferson Laboratory, Newport News, VA  23606 USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Goity
authors.affiliation: Physik Department, Technische Universität München, James-Franck-Straße 1, 85748  Garching, Germany ; Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115  Bonn, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Ketzer
authors.affiliation: Department of Physics, University of Washington, Seattle, WA 98195-1560 USA.
authors.forename: H W
authors.initials: HW
authors.lastname: Lin
authors.affiliation: Department Fisica Teorica I, Universidad Complutense de Madrid, 28040  Madrid, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: Llanes-Estrada
authors.affiliation: PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099  Mainz, Germany.
authors.forename: H B
authors.initials: HB
authors.lastname: Meyer
authors.affiliation: Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia ; Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia.
authors.forename: P
authors.initials: P
authors.lastname: Pakhlov
authors.affiliation: Centre for Theoretical Physics, University of Groningen, 9747 AG  Groningen, The Netherlands.
authors.forename: E
authors.initials: E
authors.lastname: Pallante
authors.affiliation: Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia ; Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia.
authors.forename: M I
authors.initials: MI
authors.lastname: Polikarpov
authors.affiliation: Institut de Physique Nucléaire CNRS/IN2P3, Université Paris-Sud, 91405  Orsay, France.
authors.forename: H
authors.initials: H
authors.lastname: Sazdjian
authors.affiliation: Institut für Theoretische Physik, Technische Universität Wien, 1040  Vienna, Austria.
authors.forename: A
authors.initials: A
authors.lastname: Schmitt
authors.affiliation: Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408 USA.
authors.forename: W M
authors.initials: WM
authors.lastname: Snow
authors.affiliation: Physik Department, Technische Universität München, James-Franck-Straße 1, 85748  Garching, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Vairo
authors.affiliation: Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94551 USA ; Physics Department, University of California, Davis, CA 95616 USA.
authors.forename: R
authors.initials: R
authors.lastname: Vogt
authors.affiliation: Department of Physics and Helsinki Institute of Physics, University of Helsinki, Helsinki, P.O. Box 64, 00014 Finland.
authors.forename: A
authors.initials: A
authors.lastname: Vuorinen
authors.affiliation: PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099  Mainz, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Wittig
authors.affiliation: Department of Physics, University of Virginia, 382 McCormick Rd., P.O. Box 400714, Charlottesville, VA  22904-4714 USA.
authors.forename: P
authors.initials: P
authors.lastname: Arnold
authors.affiliation: NIKHEF, Science Park 105, 1098 XG  Amsterdam, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Christakoglou
authors.affiliation: Istituto Nazionale di Fisica Nucleare (INFN), Via E. Fermi 40, 00044  Frascati, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Di Nezza
authors.affiliation: Wuppertal University, 42119  Wuppertal, Germany ; Eötvös University, 1117  Budapest, Hungary ; Forschungszentrum Jülich, 52425  Jülich, Germany.
authors.forename: Z
authors.initials: Z
authors.lastname: Fodor
authors.affiliation: Albert Einstein Center for Fundamental Physics, Institut für Theoretische Physik, Universität Bern, Sidlerstraße 5, 3012  Bern, Switzerland.
authors.forename: X
authors.initials: X
authors.lastname: Garcia I Tormo
authors.affiliation: Atominstitut, Technische Universität Wien, 1040  Vienna, Austria.
authors.forename: R
authors.initials: R
authors.lastname: Höllwieser
authors.affiliation: Faculty of Physics, Warsaw University of Technology, 00-662  Warsaw, Poland.
authors.forename: M A
authors.initials: MA
authors.lastname: Janik
authors.affiliation: European Organization for Nuclear Research (CERN), Geneva, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Kalweit
authors.affiliation: Department of Physics, Kent State University, Kent, OH  44242 USA.
authors.forename: D
authors.initials: D
authors.lastname: Keane
authors.affiliation: Crete Center for Theoretical Physics, Department of Physics, University of Crete, 71003  Heraklion, Greece ; Laboratoire APC, Université Paris Diderot, Paris Cedex 13, Sorbonne Paris-Cité , 75205 France ; Theory Group, Physics Department, CERN, 1211 Geneva 23, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Kiritsis
authors.affiliation: Faculty of Science, Utrecht University, Princetonplein 5, 3584 CC  Utrecht, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Mischke
authors.affiliation: Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia ; Moscow Physical Engineering Institute, Moscow, 115409 Russia.
authors.forename: R
authors.initials: R
authors.lastname: Mizuk
authors.affiliation: Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
authors.forename: G
authors.initials: G
authors.lastname: Odyniec
authors.affiliation: Centre for Theoretical Physics, University of Groningen, 9747 AG  Groningen, The Netherlands.
authors.forename: K
authors.initials: K
authors.lastname: Papadodimas
authors.affiliation: IFIC, Universitat de València, CSIC, Apt. Correus 22085, 46071  València, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Pich
authors.affiliation: Departamento de Fisica Teorica y del Cosmos and CAFPE, Campus Fuentenueva s. n., Universidad de Granada, 18071  Granada, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Pittau
authors.affiliation: Physics Department, Brookhaven National Laboratory, Upton, NY 11973 USA ; C. N. Yang Institute for Theoretical Physics and Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 USA.
authors.forename: J-W
authors.initials: JW
authors.lastname: Qiu
authors.affiliation: Dipartimento di Fisica, Università degli Studi di Napoli Federico II, 80126  Napoli, Italy ; INFN, Sezione di Napoli, 80126  Napoli, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Ricciardi
authors.affiliation: Departamento de Fisica de Particulas y IGFAE, Universidade de Santiago de Compostela, 15782  Santiago de Compostela, Galicia, Spain.
authors.forename: C A
authors.initials: CA
authors.lastname: Salgado
authors.affiliation: Department of Physics, Washington University, St Louis, MO  63130 USA.
authors.forename: K
authors.initials: K
authors.lastname: Schwenzer
authors.affiliation: Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780  Bochum, Germany.
authors.forename: N G
authors.initials: NG
authors.lastname: Stefanis
authors.affiliation: PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099  Mainz, Germany.
authors.forename: G M
authors.initials: GM
authors.lastname: von Hippel
authors.affiliation: Max-Planck-Institute for Physics, Föhringer Ring 6, 80805  Munich, Germany ; Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia ; Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia ; School of Biomedicine, Far Eastern Federal University, Sukhanova str 8, Vladivostok, 690950 Russia.
authors.forename: V I
authors.initials: VI
authors.lastname: Zakharov