Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Kotko, Piotr; Kutak, Krzysztof; Marquet, Cyrille; Petreska, Elena; Sapeta, Sebastian; Hameren, A. van

doi:10.1007/jhep09(2015)106

Cited by 129 publications

(142 citation statements)

References 60 publications

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“…It is easy to verify that the non-vanishing leading term of such power expansion is identical to the hard part appears in the TMD factorization formula using the Ward identity argument [5,[57][58][59]. The similar equivalence between the TMD and the CGC has also been established for the dense medium region case [20,21,29,31].…”

Section: Discussionmentioning

confidence: 57%

The evolution of the small x gluon TMD

Zhou

2016

J. High Energ. Phys.

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Abstract:We study the evolution of the small x gluon transverse momentum dependent (TMD) distribution in the dilute limit. The calculation has been carried out in the Ji-MaYuan scheme using a simple quark target model. As expected, we find that the resulting small x gluon TMD simultaneously satisfies both the Collins-Soper (CS) evolution equation and the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equation. We thus confirmed the earlier finding that the high energy factorization (HEF) and the TMD factorization should be jointly employed to resum the different type large logarithms in a process where three relevant scales are well separated.

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Section: Discussionmentioning

confidence: 57%

The evolution of the small x gluon TMD

Zhou

2016

J. High Energ. Phys.

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“…This has been extended to finite N c and polarization dependent cases for heavy quark production in pA collisions in ref. [28], as well as to other channels for two particle production in pA collisions [36][37][38].…”

Section: Jhep10(2017)196mentioning

confidence: 99%

Suppression of maximal linear gluon polarization in angular asymmetries

Boer

Mulders

Zhou

et al. 2017

J. High Energ. Phys.

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Abstract:We perform a phenomenological analysis of the cos 2φ azimuthal asymmetry in virtual photon plus jet production induced by the linear polarization of gluons in unpolarized pA collisions. Although the linearly polarized gluon distribution becomes maximal at small x, TMD evolution leads to a Sudakov suppression of the asymmetry with increasing invariant mass of the γ * -jet pair. Employing a small-x model input distribution, the asymmetry is found to be strongly suppressed under TMD evolution, but still remains sufficiently large to be measurable in the typical kinematical region accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected to be negligible in Z/W -jet pair production at LHC. We point out the optimal kinematics for RHIC and LHC studies, in order to expedite the first experimental studies of the linearly polarized gluon distribution through this process. We further argue that this is a particularly clean process to test the k t -resummation formalism in the small-x regime.

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“…The combination of quarkonium production at small x may thus be expected to yield rather clean signals of gluon TMD effects, because the small x-values enhance the gluon contributions and the quarkonium acts as a filter, reducing the contribution from quarks even further. The small-x limit also allows consideration of a larger class of processes, because certain factorization breaking partonic subprocesses may become suppressed in this limit, resulting effectively in a restoration of TMD factorization or in some form of hybrid factorization involving both TMDs and collinear distributions [46,47]. The latter is often considered for the process p A → h X.…”

Section: Small-x Limitmentioning

confidence: 99%

“…In contrast to dijet production in DIS, dijet production in p A collisions, probes a combination of six unpolarized gluon TMDs [47], which reduce to a combination of DP and WW TMDs in the large-N c limit. It will be extremely hard to extract these six TMDs from experiment.…”

Section: Unpolarized Gluon Tmds At Small Xmentioning

confidence: 99%

Gluon TMDs in Quarkonium Production

Boer

2017

Few-Body Syst

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Quarkonium production offers good possibilities to study gluon TMDs. In this proceedings contribution this topic is explored for the linearly polarized gluons inside unpolarized hadrons and unpolarized gluons inside transversely polarized hadrons. It is argued that χ b0/2 and η b production at LHC are best to study the effects of linearly polarized gluons in hadronic collisions, by means of angular independent ratios of ratios of cross sections. This can be directly compared to cos 2φ asymmetries in heavy quark pair and dijet production in DIS at a future high-energy Electron-Ion Collider (EIC), which probe the same TMDs. In the small-x limit this corresponds to the Weizsäcker-Williams (WW) gluon distributions, which should show a change in behavior for transverse momenta around the saturation scale. Together with investigations of the dipole (DP) gluon distributions, this can provide valuable information about the polarization of the Color Glass Condensate if sufficiently small x-values are reached. Quarkonia can also be useful in the study of single transverse spin asymmetries. For transversely polarized hadrons the gluon distribution can be asymmetric, which is referred to as the Sivers effect. It leads to single spin asymmetries in for instance J/ψ (pair) production at AFTER@LHC, which probe the WW or f -type gluon Sivers TMD. It allows for a test of a sign-change relation w.r.t. the gluon Sivers TMD probed at an EIC in open heavy quark pair production. Single spin asymmetries in backward inclusive C-odd quarkonium production, such as J/ψ production, may offer probes of the DP or d-type gluon Sivers TMD at small x-values in the polarized proton, which in that limit corresponds to a correlator of a single Wilson loop, describing the spin-dependent odderon.

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Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Cited by 129 publications

References 60 publications

The evolution of the small x gluon TMD

The evolution of the small x gluon TMD

Suppression of maximal linear gluon polarization in angular asymmetries

Gluon TMDs in Quarkonium Production

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