Signature of gluon saturation in forward di-hadron correlations at the Large Hadron Collider

Giacalone, Giuliano; Marquet, Cyrille

doi:10.1016/j.nuclphysa.2018.10.009

Cited by 5 publications

(4 citation statements)

References 93 publications

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“…Furthermore, in the photoproduction limit, our results for transversely polarized can be readily applied to study inclusive dihadron production in ultra-peripheral collisions (UPCs) at RHIC and the LHC, where current studies have focused only on dijet production [96] albeit not at full NLO level. Lastly, our present calculations can be extended to study hadron production in proton-nucleus collisions such as photon-hadron [23] and hadron-hadron correlations [22,97] where we also expect the necessity to employ TMD fragmentation functions to properly resum Sudakov logarithms associated with the final state.…”

Section: Discussionmentioning

confidence: 99%

Back-to-back inclusive dijets in DIS at small x: Sudakov suppression and gluon saturation at NLO

Caucal

Salazar

Schenke

et al. 2022

J. High Energ. Phys.

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Back-to-back dijet cross-sections in deeply inelastic scattering (DIS) at small xBj are suppressed by many-body multiple scattering and screening effects arising from gluon saturation at high parton densities. They are similarly sensitive in these kinematics to large Sudakov logarithms from soft gluon radiation. Uncovering novel physics in this DIS channel therefore requires understanding the interplay of the two phenomena. In this work, we compute the small xBj inclusive dijet DIS cross-section in back-to-back kinematics at next-to-leading order (NLO) in the Color Glass Condensate effective field theory (CGC EFT). Our result includes, for the first time, all real and virtual NLO contributions to the impact factor. These include all Sudakov double and single logarithm contributions, as well as all other finite $$ \mathcal{O} $$ O (αs) terms that contribute at this order. We demonstrate explicitly that resummations of small x and Sudakov logarithms can be performed simultaneously in the CGC EFT. This requires that the JIMWLK kernel for small x evolution of the Weizsäcker-Williams (WW) gluon distribution satisfies a kinematic constraint imposed by lifetime ordering of successive gluon emissions; the corresponding modifications to the kernel, corresponding to resummations of large double transverse logarithms, are precisely of the type required to stabilize JIMWLK evolution beyond leading logarithmicaccuracy. We compute the azimuthal harmonics of the NLO back-to-back distributions and show their sensitivity to both the unpolarized and linearly polarized WW gluon distributions. Finally, we discuss how TMD factorization is broken by an emergent saturation scale at small x.

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Section: Discussionmentioning

confidence: 99%

Back-to-back inclusive dijets in DIS at small x: Sudakov suppression and gluon saturation at NLO

Caucal

Salazar

Schenke

et al. 2022

J. High Energ. Phys.

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“…Much of the discussion on azimuthal angle correlations at small x in the CGC and related frameworks has been restricted to dijet/dihadron production in p(d) + A collisions [41,[43][44][45][46][47][48][49][50][51][52][53][54][55]. Similar studies have been performed for the case of e + A scattering for the production of dijets/dihadrons [42,[56][57][58] and trijets 3 [61].…”

Section: Introductionmentioning

confidence: 99%

Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small x

Kolbé

Roy

Salazar

et al. 2021

J. High Energ. Phys.

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We compute the differential cross-section for inclusive prompt photon+quark production in deeply inelastic scattering of electrons off nuclei at small x (e + A DIS) in the framework of the Color Glass Condensate effective field theory. The result is expressed as a convolution of the leading order (in the strong coupling αs) impact factor for the process and universal dipole matrix elements, in the limit of hard photon transverse momentum relative to the nuclear saturation scale Qs,A(x). We perform a numerical study of this process for the kinematics of the Electron-Ion Collider (EIC), exploring in particular the azimuthal angle correlations between the final state photon and quark. We observe a systematic suppression and broadening pattern of the back-to-back peak in the relative azimuthal angle distribution, as the saturation scale is increased by replacing proton targets with gold nuclei. Our results suggest that photon+jet final states in inclusive e + A DIS at high energies are in general a promising channel for exploring gluon saturation that is complementary to inclusive and diffractive dijet production. They also provide a sensitive empirical test of the universality of dipole matrix elements when compared to identical measurements in proton-nucleus collisions. However because photon+jet correlations at small x in EIC kinematics require jet reconstruction at small k⊥, it will be important to study their feasibility relative to photon-hadron correlations.

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Section: Introductionmentioning

confidence: 99%

Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$

Kolbé,

Roy,

Salazar

et al. 2020

Preprint

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We compute the differential cross-section for inclusive prompt photon+quark production in deeply inelastic scattering of electrons off nuclei at small x (e + A DIS) in the framework of the Color Glass Condensate effective field theory. The result is expressed as a convolution of the leading order (in the strong coupling αs) impact factor for the process and universal dipole matrix elements, in the limit of hard photon transverse momentum relative to the nuclear saturation scale Qs,A(x). We perform a numerical study of this process for the kinematics of the Electron-Ion Collider (EIC), exploring in particular the azimuthal angle correlations between the final state photon and quark. We observe a systematic suppression and broadening pattern of the back-to-back peak in the relative azimuthal angle distribution, as the saturation scale is increased by replacing proton targets with gold nuclei. Our results suggest that photon+jet final states in inclusive e + A DIS at high energies are in general a promising channel for exploring gluon saturation that is complementary to inclusive and diffractive dijet production. They also provide a sensitive empirical test of the universality of dipole matrix elements when compared to identical measurements in proton-nucleus collisions. However because photon+jet correlations at small x in EIC kinematics require jet reconstruction at small k ⊥ , it will be important to study their feasibility relative to photon-hadron correlations.

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Signature of gluon saturation in forward di-hadron correlations at the Large Hadron Collider

Cited by 5 publications

References 93 publications

Back-to-back inclusive dijets in DIS at small x: Sudakov suppression and gluon saturation at NLO

Back-to-back inclusive dijets in DIS at small x: Sudakov suppression and gluon saturation at NLO

Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small x

Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$

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