Color entanglement for $\gamma$-jet production in polarized pA collisions
Andreas Sch\"afer, Jian Zhou
TL;DR
This paper discusses how azimuthal correlations in polarized proton-nucleus collisions can reveal the gluon distribution $G_4$, highlighting the importance of color entanglement effects in understanding transverse momentum dependent physics.
Contribution
It introduces a method to access the gluon distribution $G_4$ through photon-jet azimuthal correlations, emphasizing the role of color entanglement in polarized pA collisions.
Findings
Azimuthal correlations can probe the gluon distribution $G_4$.
Color entanglement affects transverse single spin asymmetries.
Provides a framework for more reliable TMD physics in pA collisions.
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 that enters into many such processes.
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