Azimuthal asymmetries for quark pair production in pA collisions

Abstract

We study the azimuthal asymmetries for quark pair production in proton-nucleus collisions using a hybrid approach in which the nucleus is treated in the Color Glass Condensate (CGC) framework while the Lipatov approximation is applied on the proton side. Our treatment goes beyond the large N_c limit. We particularly focus on the so-called correlation limit where the imbalance of the transverse momentum of the quark pair is much smaller than the out-going individual quark transverse momenta. In this kinematic region, a matching between the hybrid approach and a factorization in terms of transverse momentum dependent parton distributions(TMDs) has been found. It is shown which of the various unpolarized and linearly polarized gluon TMD distributions contribute to $\cos 2\varphi$ and $\cos 4\varphi$ modulations of quark pair production.

17 pages, 3 figures

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Cited by in corpus (17)

• Transverse-momentum-dependent gluon distributions from JIMWLK evolution
• Probing the linear polarization of photons in ultraperipheral heavy ion collisions
• Impact parameter dependence of the azimuthal asymmetry in lepton pair production in heavy ion collisions
• The elliptic gluon GTMD inside a large nucleus
• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Lepton pair photoproduction in peripheral relativistic heavy-ion collisions
• Prompt photon - jet angular correlations at central rapidities in p+A collisions
• Transverse single spin asymmetry in direct photon production in polarized pA collisions
• Energy evolution of T-odd gluon TMDs at small $x$
• Color entanglement for $\gamma$-jet production in polarized pA collisions
• Photoproduction of $e^{+}{e}^{-}$ in peripheral isobar collisions
• The non-equilibrium attractor: Beyond hydrodynamics
• Forward proton detectors in heavy ion physics
• Lepton pair production in ultra-peripheral collisions
• Correlations with fluctuating strings
• Nucleon Tomography with 0-jettiness
• Dijet photoproduction at low $x$ at next-to-leading order and its back-to-back limit