Color glass condensate at next-to-leading order meets HERA data

Beuf, Guillaume; Hänninen, H.; Lappi, T.; Mäntysaari, Heikki

doi:10.1103/physrevd.102.074028

Cited by 103 publications

(160 citation statements)

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“…We conclude the discussion by highlighting that the state-of-the-art was achieved in [61]. In this work, the authors compared HERA data to the predictions of the CGC at next-to-leading order (NLO) including impact factor and small-x evolution equations.…”

Section: Structure Functionsmentioning

confidence: 99%

Mining for Gluon Saturation at Colliders

Morreale

Salazar

2021

Universe

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Quantum chromodynamics (QCD) is the theory of strong interactions of quarks and gluons collectively called partons, the basic constituents of all nuclear matter. Its non-abelian character manifests in nature in the form of two remarkable properties: color confinement and asymptotic freedom. At high energies, perturbation theory can result in the growth and dominance of very gluon densities at small-x. If left uncontrolled, this growth can result in gluons eternally growing violating a number of mathematical bounds. The resolution to this problem lies by balancing gluon emissions by recombinating gluons at high energies: phenomena of gluon saturation. High energy nuclear and particle physics experiments have spent the past decades quantifying the structure of protons and nuclei in terms of their fundamental constituents confirming predicted extraordinary behavior of matter at extreme density and pressure conditions. In the process they have also measured seemingly unexpected phenomena. We will give a state of the art review of the underlying theoretical and experimental tools and measurements pertinent to gluon saturation physics. We will argue for the need of high energy electron-proton/ion colliders such as the proposed EIC (USA) and LHeC (Europe) to consolidate our knowledge of QCD knowledge in the small x kinematic domains.

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Section: Structure Functionsmentioning

confidence: 99%

Mining for Gluon Saturation at Colliders

Morreale

Salazar

2021

Universe

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“…23 Note that the running of the coupling is typically written as αs(r ⊥ ) = 1/ β0 log 1/(r 2 ⊥ Λ 2 QCD ) with β0 = (33 − 2N f )/(12π). In addition to running coupling corrections in the NLO BK [83][84][85], there are additional contributions that must be resummed such as large transverse logarithms [86,87] which slow down the evolution speed [88,89]. Phenomenological studies that employ LO BK with running coupling [65,90] are therefore effectively accounting for this slowdown by including the factor C 2 which reduces the value of the strong coupling constant.…”

Section: Set-up: Proton and Nuclear Dipole Correlators From The Running Coupling Balitsky-kovchegov Evolutionmentioning

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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“…A first fit of the dipole model to HERA data using the full NLO impact factor and Balitsky-Kovchegov evolution has been performed in ref. [33].…”

Section: Jhep06(2021)096mentioning

confidence: 99%