Physics case for a polarised target for AFTER@LHC

J.P. Lansberg , M. Anselmino , R. Arnaldi , S.J. Brodsky , V. Chambert , J.P. Didelez , M.G Echevarria , E.G. Ferreiro

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F. Fleuret Y. Gao B. Genolini C. Hadjidakis I. Hrivnacova D. Kikola A. Kurepin C. Lorce L. Massacrier A. Nass C. Pisano I. Schienbein M. Schlegel E. Scomparin J. Seixas A. Signori E. Steffens N. Topilskaya B. Trzeciak U.I. Uggerhoej A. Uras R. Ulrich Z. Yang

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classification ⚛️ nucl-ex hep-exhep-phnucl-th

keywords polarisedtargetnumberstudiesaccessiblealongasymmetriesbeams

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We review a number of ideas put forward in favour of the use of a polarised target along with the proposed idea of a fixed-target experiment using the LHC beams -- AFTER@LHC. A number of recent studies have shown that single transverse-spin asymmetries (STSAs) are large enough to be precisely measured in the region accessible with AFTER@LHC, in particular as regards the Drell-Yan process as well as single-pion, isolated-photon and jet production. AFTER@LHC with a polarised target would also be the ideal experimental set-up to measure the gluon Sivers effect via a number of original quarkonium STSA studies. We discuss first figures-of-merit based on simulations for AFTER@LHC with a polarised target.

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Physics case for a polarised target for AFTER@LHC

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