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Single-Transverse-Spin Asymmetries in Exclusive Photo-production of J/psi in Ultra-Peripheral Collisions in the Fixed-Target Mode at the LHC and in the Collider Mode at RHIC

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arxiv 1812.04553 v1 pith:QIVSHLT6 submitted 2018-12-11 hep-ph hep-exnucl-exnucl-th

J.P. Lansberg , L. Massacrier , L. Szymanowski , J. Wagner This is my paper · ORCID
classification hep-phhep-exnucl-exnucl-th
keywords collisionsmodeasymmetriescolliderexclusiveexpectedfixed-targetphoto-production
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate the potentialities offered by the study of J/psi exclusive photo-production in ultra-peripheral collisions at a fixed-target experiment using the proton and lead LHC beams (generically denoted as AFTER@LHC) on hydrogen targets and at RHIC in the collider mode. We compare the expected counting rates in both set-ups. Studying Single-Transverse-Spin Asymmetries (A_N) in such a process provides a direct path to the proton Generalised Parton Distribution (GPD) E_g(x,xi,t). We evaluate the expected precision on A_N for realistic conditions with the LHCb detector in pH(pol) and PbH(pol) collisions. We also discuss prospects with polarised deuterium and helium targets in the case of AFTER@LHC.

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  1. Off forward non-SCHC contributions to exclusive vector quarkonium production from the "spin dependent BFKL Pomeron"

    hep-ph 2025-06 conditional novelty 6.0 of 10

    The spin-dependent BFKL Pomeron generates proton-helicity-flip amplitudes in exclusive quarkonium photoproduction at order momentum transfer squared, with explicit eikonal expressions and quark-model estimates.

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