Abstract
A more reliable treatment of transverse momentum-dependent physics and in particular transverse single-spin asymmetries is urgently required, e.g. for polarized $pA$ physics including novel effects like color entanglement. We argue that the measurement of azimuthal angular correlations of photons and jets produced in $pA$ collisions provides a direct access to the novel gluon distribution ${G}_{4}$ that enters into many such processes, though practically it will be very challenging to probe this distribution experimentally as it is a $1/{N}_{c}^{2}$-suppressed effect.
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