Spin Physics at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC) Page: 1 of 4
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Spin physics at A Fixed-Target ExpeRiment at the LHC
A. Rakotozafindrabea, M. Anselminob, R. Arnaldib, S.J. Brodsky,
V. Chambertd, J.P. Didelezd, E.G. Ferreiro', F. Fleuretf, B. Genolinid,
C. Hadjidakisd, J.P. Lansbergd, C. Lorced, P. Rosierd, I. Schienbeing,
E. Scomparinb, and U.I. Uggerhojh
0IRFU/SPhN, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
bINFN Sez. Torino, Via P. Giuria 1, I-10125, Torino, Italy
CSLAC National Accelerator Laboratory, Stanford U., Menlo Park, CA 94025, USA
dIPNO, Universite Paris-Sud, CNRS/IN2P3, F-91406, Orsay, France
'Dept. de Fisica de Particulas, USC, 15782 Santiago de Compostella, Spain
fLLR, Ecole Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
9LPSC, Univ. Joseph Fourier, CNRS/IN2P3/INPG, 38026 Grenoble, France
hDepartment of Physics and Astronomy, University of Aarhus, Denmark
We outline the opportunities for spin physics which are offered by a next
generation and multi-purpose fixed-target experiment exploiting the proton
LHC beam extracted by a bent crystal. In particular, we focus on the study
of single transverse spin asymetries with the polarisation of the target.
Fixed-target experiments lead to numerous breakthroughs in particle and nu-
clear physics. In particular they contributed to the discovery of anomalously
large single  and double-spin  correlations in hadron-hadron collisions.
New opportunities [3, 4] are at reach thanks to the LHC beam of 7 TeV
protons interacting on a fixed target, be it polarised or unpolarised. Such
opportunities can be studied by a future multi-purpose experiment, thereafter
named AFTER for "A Fixed-Target ExperRiment". The LHC proton beam
colliding on fixed targets releases a cms energy close to 115 GeV, i. e. an
energy never reached in a fixed-target experiment, between SPS and RHIC.
One of the essential advantages of a fixed-target experiment is the possi-
bility to polarize the target (see e.g. ) to measure Single Spin Asymmetry
(SSA) in a number of hard reactions. We discuss here the opportunities
offered by the measurements of such SSAs.
'Talk at the SPIN 2012 Conference, JINR, Dubna, September 17 - 22, 2012.
Published by arXiv:1301.5739
Work supported in part by US Department of Energy contract DE-AC02-76SF00515.
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Rakotozafindrabe, A.; /DAPNIA, Saclay; Anselmino, M.; /INFN, Turin; Arnaldi, R.; /INFN, Turin et al. Spin Physics at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC), article, February 7, 2013; United States. (digital.library.unt.edu/ark:/67531/metadc844433/m1/1/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.