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Studies of Transverse-Momentum-Dependent distributions with A Fixed-Target ExpeRiment using the LHC beams (AFTER@LHC)

Abstract : We report on the studies of Transverse-Momentum-Dependent distributions (TMDs) at a future fixed-target experiment --AFTER@LHC-- using the $p^+$ or Pb ion LHC beams, which would be the most energetic fixed-target experiment ever performed. AFTER@LHC opens new domains of particle and nuclear physics by complementing collider-mode experiments, in particular those of RHIC and the EIC projects. Both with an extracted beam by a bent crystal or with an internal gas target, the luminosity achieved by AFTER@LHC surpasses that of RHIC by up to 3 orders of magnitude. With an unpolarised target, it allows for measurements of TMDs such as the Boer-Mulders quark distributions and the distribution of unpolarised and linearly polarised gluons in unpolarised protons. Using polarised targets, one can access the quark and gluon Sivers TMDs through single transverse-spin asymmetries in Drell-Yan and quarkonium production. In terms of kinematics, the fixed-target mode combined with a detector covering $\eta_{\rm lab} \in [1,5]$ allows one to measure these asymmetries at large $x^\uparrow$ in the polarised nucleon.
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http://hal.in2p3.fr/in2p3-01112986
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, February 4, 2015 - 9:47:54 AM
Last modification on : Thursday, November 19, 2020 - 12:59:16 PM

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L. Massacrier, M. Anselmino, R. Arnaldi, S. J. Brodsky, V. Chambert, et al.. Studies of Transverse-Momentum-Dependent distributions with A Fixed-Target ExpeRiment using the LHC beams (AFTER@LHC). 21st International Symposium on Spin Physics (Spin2014), Oct 2014, Beijing, France. pp.1660107, ⟨10.1142/S2010194516601071⟩. ⟨in2p3-01112986⟩

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