Low x physics as an infinite twist (G)TMD framework: unravelling the origins of saturation

Altinoluk, Tolga; Boussarie, Renaud

doi:10.1007/jhep10(2019)208

Cited by 60 publications

(67 citation statements)

References 70 publications

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“…Azimuthal asymmetries then arise in final observables like dijet production in DIS [112][113][114]. But, although these calculations are often performed in a framework close to that of the CGC which is related with the TMD framework at small x [115], it goes beyond the standard CGC context to link with other physics like spin.…”

Section: Non-cgc Explanationsmentioning

confidence: 99%

Particle correlations from the initial state

Altinoluk

Armesto

2020

Eur. Phys. J. A

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The observation in small size collision systems, pp and pA, of strong correlations with long range in rapidity and a characteristic structure in azimuth, the ridge phenomenon, is one of the most interesting results obtained at the large hadron collider. Earlier observations of these correlations in heavy ion collisions at the relativistic heavy ion collider are standardly attributed to collective flow due to strong final state interactions, described in the framework of viscous relativistic hydrodynamics. Even though data for small size systems are well described in this framework, the applicability of hydrodynamics is less well grounded and initial state based mechanisms have been suggested to explain the ridge. In this review, we discuss particle correlations from the initial state point of view, with focus on the most recent theoretical developments.

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Section: Non-cgc Explanationsmentioning

confidence: 99%

Particle correlations from the initial state

Altinoluk

Armesto

2020

Eur. Phys. J. A

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“…Importantly, we observe significant deviations from the correlation limit at |∆| < |P | < 1.5 GeV for the gold target, and much milder deviations for the proton. This difference is explained by saturation effects: The cross sections beyond the correlation limit approximation receive genuine saturation corrections of order Q 2 s /|P | 2 and Q 2 s /Q 2 , in addition to kinematic corrections of order |∆| 2 /|P | 2 [20,21]. This observation demonstrates that inclusive dijet production in e+A collisions at a future EIC can provide direct access to gluon saturation.…”

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confidence: 91%

“…We further show that corrections to the correlation limit approximation also become important when |P | Q s , even when |P | > |∆| holds. These corrections, enhanced by the saturation scale Q s , probe genuine multi-gluon correlations [20,21], and are not encompassed by the resummed kinematic twists of the improved TMD framework [22] (see also [23][24][25][26][27][28] for forward dijets in dilute-dense hadronic collisions, and experimental measurements from RHIC [29,30]). Calculations of the elliptic anisotropy employing multigluon correlators deviate strongly from the correlation limit for |P | |∆|.…”

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confidence: 99%

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

et al. 2020

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We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum P and recoil momentum ∆, as well as the anisotropy in the relative angle between P and ∆. We use the nonlinear Gaussian approximation to compute multiparticle correlators for general small x kinematics, employing running coupling Balitsky-Kovchegov evolution to determine the dipole amplitude at small x. Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that |P | |∆|. We validate this approximation in its range of applicability and quantify its failure for |P | |∆|. We also predict significant targetdependent deviations from the correlation limit approximation for |P | > |∆| and |P | Qs, which offers a straightforward test of gluon saturation and access to multi-gluon distributions at a future electron ion collider. arXiv:1912.05586v1 [nucl-th]

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“…The proof of this scheme as an all-order kinematic twist resummation was recently established in refs. [23,24].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of three jets in the CGC: gluon TMDs and dilute limit

Altinoluk

Boussarie

Marquet

et al. 2020

J. High Energ. Phys.

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We study the process γA → qqg + X in the Color Glass Condensate (CGC) effective theory. After obtaining the cross section, we consider two kinematic limits which are encompassed in our result. In the so-called correlation limit, the vector sum of the transverse momenta of the three outgoing particles is small with respect to the individual transverse momenta; the cross section then simplifies considerably and can be written in a factorized form, sensitive to both the unpolarized and linearly-polarized Weizsäcker-Williams transverse momentum dependent gluon distribution function (gluon TMD). The second limit of the CGC cross section that we consider is the dilute limit, which we obtain after performing a weak-field expansion; we recover a typical linear-regime expression, involving a single unintegrated gluon distribution function. Using numerical simulations of the small-x QCD evolution of the TMDs, we investigate the rapidity dependence of the cross section in the correlation limit.

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Low x physics as an infinite twist (G)TMD framework: unravelling the origins of saturation

Cited by 60 publications

References 70 publications

Particle correlations from the initial state

Particle correlations from the initial state

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

Photoproduction of three jets in the CGC: gluon TMDs and dilute limit

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