Only the C-even twist-3 gluon distribution contributes to the J/psi single transverse-spin asymmetry, providing a probe of gluon TMDs with sizable predicted effects at collider energies.
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The twist-3 gluon contribution to $A_N$ in $J/\psi$ production in $pp$ collisions
Only the C-even twist-3 gluon distribution contributes to the J/psi single transverse-spin asymmetry, providing a probe of gluon TMDs with sizable predicted effects at collider energies.