Physics case for a polarised target for AFTER@LHC

J.P. Lansberg∗1, M. Anselmino2, R. Arnaldi2, S.J. Brodsky3, V. Chambert1, J.P. Didelez1, M.G Echevarria4, E.G. Ferreiro5, F. Fleuret6, Y. Gao7, B. Genolini1, C. Hadjidakis1, I. Hřivnacova1, D. Kikola8, A. Kurepin9, C. Lorce10, L. Massacrier1,11, A. Nass12, C. Pisano13 I. Schienbein14, M. Schlegel15, E. Scomparin2, J. Seixas16, A. Signori17, E. Steffens18, N. Topilskaya9, B. Trzeciak19 U.I. Uggerhoj20, A. Uras21, R. Ulrich22, and Z. Yang6. 1 IPNO, Univ. Paris-Sud, CNRS/IN2P3, Universite Paris-Saclay, Orsay, France 2 Dip. di Fisica and INFN Sez. Torino, Via P. Giuria 1, Torino, Italy 3 SLAC National Accelerator Laboratory, Stanford University, Menlo Park, USA 4 ECM, Universitat de Barcelona, Barcelona, Spain 5 Dept. de Fisica de Particulas, USC, Santiago de Compostella, Spain 6 LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France 7 CHEP, Department of Engineering Physics, Tsinghua University, Beijing, China 8 Faculty of Physics, Warsaw University of Technology, Warsaw, Poland 9 Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia 10 CPhT, Ecole Polytechnique, CNRS, Universite Paris-Saclay, Palaiseau, France 11 LAL, Univ. Paris-Sud, CNRS/IN2P3, Universite Paris-Saclay, Orsay, France 12 Institut fur Kernphysik, Forschungszentrum Julich, Julich, Germany 13 Dipartimento di Fisica, Universita degli Studi di Pavia, Pavia, Italy 14 LPSC, Univ. Joseph Fourier, CNRS/IN2P3/INPG, Grenoble, France 15 Institute for Theoretical Physics, Tubingen U., Tubingen, Germany 16 LIP and IST, Lisbon, Portugal 17 Nikhef and Dept. of Physics and Astronomy, VU Amsterdam, Amsterdam, The Netherlands 18 Physics Institute, Friedrich-Alexander University Erlangen-Nrnberg, Erlangen, Germany 19 Institute for Subatomic Physics, Utrecht University, Utrecht, The Netherlands 20 Department of Physics and Astronomy, University of Aarhus, Denmark 21 IPNL, Universite Claude Bernard Lyon-I, CNRS/IN2P3, Villeurbanne, France 22 Institut fur Kernphysik, Karlsruhe Institute of Technology (KIT), Karlsruhe, German