Transverse momentum imbalance of back-to-back particle production inp+Aande+Acollisions

Abstract

We study the nuclear enhancement of the transverse momentum imbalance for back-to-back particle production in both $p+A$ and $e+A$ collisions. Specifically, we present results for $\mathrm{\text{photon}}+\mathrm{\text{jet}}$ and $\mathrm{\text{photon}}+\mathrm{\text{hadron}}$ production in $p+A$ collisions, di-jet and di-hadron production in $e+A$ collisions, and heavy-quark and heavy-meson pair production in both $p+A$ and $e+A$ collisions. We evaluate the effect of both initial-state and final-state multiple scattering, which determine the strength of the nuclear-induced transverse momentum imbalance in these processes. We give theoretical predictions for the experimentally relevant kinematic regions in $d+Au$ collisions at Relativistic Heavy Ion Collider, $p+Pb$ collisions at Large Hadron Collider and $e+A$ collisions at the future Electron Ion Collider and Large Hadron Electron Collider.