Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

Mäntysaari, Heikki; Mueller, Niklas; Salazar, Farid; Schenke, Björn

doi:10.1103/physrevlett.124.112301

Cited by 72 publications

(74 citation statements)

References 81 publications

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“…In order to JHEP12(2020)181 make our ITMD/CGC comparison feasible and clear, we shall restrict our analysis to the forward quark (qq) dijet production, and work within the Gaussian truncation of JIMWLK evolution and large-N c limit, for which the CGC expression is less complicated and can be evaluated directly (indeed, as we will see below, the two expressions then differ only in their hard factors). In this regard, we note that genuine-twist corrections were also analyzed recently in the context of dijet production in deep-inelastic scattering [21], using the same approximation but keeping finite N c corrections.…”

Section: Introductionmentioning

confidence: 72%

Comparison of improved TMD and CGC frameworks in forward quark dijet production

Fujii¹,

Marquet²,

Watanabe³

2020

J. High Energ. Phys.

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For studying small-x gluon saturation in forward dijet production in high-energy dilute-dense collisions, the improved TMD (ITMD) factorization formula was recently proposed. In the Color Glass Condensate (CGC) framework, it represents the leading term of an expansion in inverse powers of the hard scale. It contains the leading-twist TMD factorization formula relevant for small gluon’s transverse momentum kt, but also incorporates an all-order resummation of kinematical twists, resulting in a proper matching to high-energy factorization at large kt. In this paper, we evaluate the accuracy of the ITMD formula quantitatively, for the case of quark dijet production in high-energy proton-proton(p+p) and proton-nucleus (p+A) collisions at LHC energies. We do so by comparing the quark-antiquark azimuthal angle ∆ϕ distribution to that obtained with the CGC formula. For a dijet with each quark momentum pt much larger than the target saturation scale, Qs, the ITMD formula is a good approximation to the CGC formula in a wide range of azimuthal angle. It becomes less accurate as the jet pt’s are lowered, as expected, due to the presence of genuine higher-twists contributions in the CGC framework, which represent multi-body scattering effects absent in the ITMD formula. We find that, as the hard jet momenta are lowered, the accuracy of ITMD start by deteriorating at small angles, in the high-energy-factorization regime, while in the TMD regime near ∆ϕ = π, very low values of pt are needed to see differences between the CGC and the ITMD formula. In addition, the genuine twists corrections to ITMD become visible for higher values of pt in p + A collisions, compared to p+p collisions, signaling that they are enhanced by the target saturation scale.

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Section: Introductionmentioning

confidence: 72%

Comparison of improved TMD and CGC frameworks in forward quark dijet production

Fujii¹,

Marquet²,

Watanabe³

2020

J. High Energ. Phys.

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“…Along the same lines, taking into account the multigluon correlations inside nuclear targets at small x in Ref. [16] the elliptic modulation of diffractive dijets was investigated and it was shown that saturation effects are significant when looking at the nuclear modification of the ratio between the differential inclusive and diffractive dijet cross sections. Authors of Ref.…”

Section: Provides a Direct Measurement Of The Saturation Scale As A Fmentioning

confidence: 99%

Investigating the diffractive gluon jet production in lepton-ion collisions

2020

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We study the diffractive jet production in electron-ion collisions in the kinematic region where the mass M X of the diffractive final state is larger than Q 2. Based on parton saturation framework, predictions are done for the kinematics of future or possible eA machines as the EIC, LHeC, HE-LHeC, and FCC-eA. We analyze the differential cross section as a function of jet (gluon) transverse momentum and from the experimental point of view this observable could be used to extract the saturation scale as a function of x IP .

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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]. We will explore here such correlations between the observed photon and quark in the context of e + A collisions at small x.…”

Section: Introductionmentioning

confidence: 95%

“…Specifically, in the case of photon+dijet production, the quantum expectation value for the process depends on two-point "dipole" and four-point "quadrupole" correlators [38]. The former is accessed in fully inclusive DIS while extraction of the latter requires more differential measurements such as inclusive dijet production [41,42] and the photon+dijet process discussed in [38].…”

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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Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

Cited by 72 publications

References 81 publications

Comparison of improved TMD and CGC frameworks in forward quark dijet production

Comparison of improved TMD and CGC frameworks in forward quark dijet production

Investigating the diffractive gluon jet production in lepton-ion collisions

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

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