Low-$x$ improved TMD approach to the lepto- and hadroproduction of a heavy-quark pair

Abstract

We study lepto- and hadroproduction of a heavy-quark pair in the ITMD factorization framework for dilute-dense collisions. Due to the presence of a nonzero quark mass and/or nonzero photon virtuality, new contributions appear compared to the cases of photo- and hadroproduction of dijets, for which the ITMD framework was originally derived. The extra terms are sensitive to gluons that are not fully linearly polarized. At small $x$ those gluons emerge only when saturation effects are taken into account, and in a proper way. As a result, in linear small-$x$ frameworks where gluon are fully linearly polarized, such contributions are absent. We show however that they are not always negligible, even for large gluon transverse momentum, due to the behavior of the off-shell hard factors.

18 pages, 5 figures

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• Dihadron Production in DIS at Small $x$ at Next to Leading Order: Transverse Photons
• Probing gluon number density with electron-dijet correlations at EIC
• Energy evolution of T-odd gluon TMDs at small $x$
• Exotic tetraquarks at the HL-LHC with JETHAD: A high-energy viewpoint
• Rapidity-only TMD factorization at one loop
• Transverse Momentum Dependent Gluon Distribution within High Energy Factorization at Next-to-Leading Order
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• Quark TMDs from back-to-back dijet production at forward rapidities in pA collisions beyond eikonal accuracy in the CGC
• Tetraquark-Jet Systems at the High-Luminosity LHC
• Dijet impact factor in DIS at next-to-leading order in the Color Glass Condensate
• Predictions for photon-jet correlations at forward rapidities in heavy-ion collisions
• Dijet photoproduction at low $x$ at next-to-leading order and its back-to-back limit