EPJ Web of Conferences
Volume 85, 20154th International Workshop on Transverse Polarisation Phenomena in Hard Processes (TRANSVERSITY 2014)
|Number of page(s)||6|
|Published online||23 January 2015|
Spin physics and TMD studies at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC)
1 IPNO, Université, Paris-Sud, CNRS/IN2P3, F-91406, Orsay, France
2 Dip. di Fisica and INFN Sez. Torino, Via P. Giuria 1, I-10125, Torino, Italy
3 SLAC National Accelerator Lab., Theoretical Physics, Stanford University, Menlo Park, CA 94025, USA
4 Institute for Theoretical Physics, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
5 Departamento de Física de Partículas, Universidade de Santiago de C., 15782 Santiago de C., Spain
6 Laboratoire Leprince Ringuet, École Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
7 Center for High Energy Physics, Department of Engineering Physics, Tsinghua University, Beijing, China
8 IFPA, AGO Dept., Université de Liège, Sart-Tilman, 4000 Liège, Belgium
9 SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
10 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
11 Dept. of Physics and Astronomy, University of Aarhus, Denmark
12 Nikhef and Dept. of Physics & Astronomy, VU University Amsterdam, NL-1081 HV Amsterdam, The Netherlands
13 IRFU/SPhN, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
14 LPSC, Université Joseph Fourier, CNRS/IN2P3/INPG, F-38026 Grenoble, France
15 FNSPE, Czech Technical U., Prague, Czech Republic
16 Institut für Kernphysik, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
a e-mail: Jean-Philippe.Lansberg@in2p3.fr
Published online: 23 January 2015
We report on the opportunities for spin physics and Transverse-Momentum Dependent distribution (TMD) studies at a future multi-purpose fixed-target experiment using the proton or lead ion LHC beams extracted by a bent crystal. The LHC multi-TeV beams allow for the most energetic fixed-target experiments ever performed, opening new domains of particle and nuclear physics and complementing that of collider physics, in particular that of RHIC and the EIC projects. The luminosity achievable with AFTER@LHC using typical targets would surpass that of RHIC by more that 3 orders of magnitude in a similar energy region. In unpolarised proton-proton collisions, AFTER@LHC allows for measurements of TMDs such as the Boer-Mulders quark distributions, the distribution of unpolarised and linearly polarised gluons in unpolarised protons. Using the polarisation of hydrogen and nuclear targets, one can measure transverse single-spin asymmetries of quark and gluon sensitive probes, such as, respectively, Drell-Yan pair and quarkonium production. The fixed-target mode has the advantage to allow for measurements in the target-rapidity region, namely at large x↑ in the polarised nucleon. Overall, this allows for an ambitious spin program which we outline here.
© Owned by the authors, published by EDP Sciences, 2015
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