scholarly journals Diffractive dijet production from the Color Glass Condensate and the small-$x$ gluon distributions

2019 ◽  
Author(s):  
Heikki Mäntysaari ◽  
Niklas Mueller ◽  
Björn Schenke
Keyword(s):  
Color Glass ◽  
Color Glass Condensate ◽  
Dijet Production ◽  
Small X ◽  
Gluon Distributions ◽  
Diffractive Dijet

scholarly journals TMD gluon distributions at small x in the CGC theory

2018 ◽  
Vol 27 (05) ◽  
pp. 1830003 ◽  
Author(s):  
Elena Petreska
Keyword(s):  
Transverse Momentum ◽  
Recent Progress ◽  
Effective Theory ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Transverse Momentum Dependent ◽  
Small X ◽  
Gluon Saturation ◽  
Gluon Distributions ◽  
Domain Of Validity

In this paper, we review recent progress in the description of unpolarized transverse-momentum-dependent (TMD) gluon distributions at small [Formula: see text] in the color glass condensate (CGC) effective theory. We discuss the origin of the nonuniversality of TMD gluon distributions in the TMD factorization framework and in the CGC theory and the equivalence of the two approaches in their overlapping domain of validity. We show some applications of this equivalence, including recent results on the behavior of TMD gluon distributions at small [Formula: see text], and on the study of gluon saturation. We discuss recent advances in the unification of the TMD evolution and the nonlinear small-[Formula: see text] evolution of gluon distributions.

scholarly journals Dijet impact factor in DIS at next-to-leading order in the Color Glass Condensate

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Paul Caucal ◽  
Farid Salazar ◽  
Raju Venugopalan
Keyword(s):  
Impact Factor ◽  
Wilson Line ◽  
Effective Field ◽  
Color Glass ◽  
Inelastic Electron ◽  
Color Glass Condensate ◽  
Leading Order ◽  
Dijet Production ◽  
Discovery Potential ◽  
The Impact

Abstract We compute the next-to-leading order impact factor for inclusive dijet production in deeply inelastic electron-nucleus scattering at small xBj. Our computation, performed in the framework of the Color Glass Condensate effective field theory, includes all real and virtual contributions in the gluon shock wave background of all-twist lightlike Wilson line correlators. We demonstrate explicitly that the rapidity evolution of these correlators, to leading logarithmic accuracy, is described by the JIMWLK Hamiltonian. When combined with the next-to-leading order JIMWLK Hamiltonian, our results for the impact factor improve the accuracy of the inclusive dijet cross-section to $$ \mathcal{O} $$ O ($$ {\alpha}_s^2 $$ α s 2 ln(xf/xBj)), where xf is a rapidity factorization scale. These results are an essential ingredient in assessing the discovery potential of inclusive dijets to uncover the physics of gluon saturation at the Electron-Ion Collider.

scholarly journals The Weizsäcker-Williams distribution of linearly polarized gluons (and its fluctuations) at small x

2018 ◽  
Vol 172 ◽  
pp. 03009 ◽  
Author(s):  
Adrian Dumitru ◽  
Vladimir Skokov
Keyword(s):  
Evolution Equations ◽  
High Energy ◽  
Dijet Production ◽  
Light Cone Gauge ◽  
Geometric Scaling ◽  
Linearly Polarized ◽  
Small X ◽  
Covariant Gauge ◽  
Gluon Distributions ◽  
Liouville Action

The conventional and linearly polarized Weizsäcker-Williams gluon distributions at small x are defined from the two-point function of the gluon field in light-cone gauge. They appear in the cross section for dijet production in deep inelastic scattering at high energy. We determine these functions in the small-x limit from solutions of the JIMWLK evolution equations and show that they exhibit approximate geometric scaling. Also, we discuss the functional distributions of these WW gluon distributions over the JIMWLK ensemble at rapidity Y ~ 1/αs. These are determined by a 2d Liouville action for the logarithm of the covariant gauge function g2tr A+(q)A+(-q). For transverse momenta on the order of the saturation scale we observe large variations across configurations (evolution trajectories) of the linearly polarized distribution up to several times its average, and even to negative values.

Cronin effect and high p⊥ suppression from Color Glass Condensate

2005 ◽  
Vol 20 (19) ◽  
pp. 4393-4398
Author(s):  
KAZUNORI ITAKURA
Keyword(s):  
Color Glass ◽  
Color Glass Condensate ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Cronin Effect ◽  
Modification Factor ◽  
Gluon Distributions

We present an analytical understanding of properties of the ratio between gluon distributions of a nucleus and a proton based on the framework of the Color Glass Condensate. This ratio is closely related to the nuclear modification factor in the deuteron- Au collisions measured by Brahms experiment at RHIC.

scholarly journals Photons as Probes of Gluon Saturation in DiluteDense Collisions

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 33
Author(s):  
Sanjin Benić ◽  
Kenji Fukushima ◽  
Oscar Garcia-Montero ◽  
Raju Venugopalan
Keyword(s):  
Cross Section ◽  
Center Of Mass ◽  
Effective Field ◽  
Photon Production ◽  
Color Glass ◽  
Leading Order ◽  
Small X ◽  
Gluon Saturation ◽  
Gluon Distributions ◽  
Good Agreement

We use the Color Glass Condensate (CGC) effective field theory (EFT) to calculate inclusive photon production to leading order q g → q γ , (LO), and next-to leading order g g → q q ¯ γ (NLO) at LHC energies. These processes dominate the photon production at small-x , where x ≲ 0 . 01 in the target and projectile protons. We show that the NLO contribution dominates at values of x typical at the LHC, since its cross-section is sensitive to the gluon distributions in both protons. We perform a comparison of our results to the available inclusive photon data, from ATLAS and CMS at center-of-mass energies of 2 . 76 and 7 TeV . This data lies in the range k ⊥ > 20 GeV . We show that for this range, the k ⊥ -factorized cross-section converges to the full CGC EFT result, and can be used for the comparison. We find that it gives good agreement with experimental results. Our results are to be considered as a first step towards constraining unintegrated gluon distributions, which will be continued for larger systems, where coherent scatterings are enhanced.

PROTON NUCLEUS COLLISIONS AND THE COLOR GLASS CONDENSATE

2004 ◽  
Vol 19 (17) ◽  
pp. 1251-1266 ◽  
Author(s):  
JAMAL JALILIAN-MARIAN
Keyword(s):  
High Energy ◽  
Parton Density ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Density Limit ◽  
Small X

We review the high parton density limit of QCD and show how the Color Glass Condensate arises at small xbj. We discuss the applications of the Color Glass Condensate formalism to proton (deuteron) nucleus collisions at high energy colliders, such as RHIC and LHC.

scholarly journals SMALL x PHYSICS AND RHIC DATA

2011 ◽  
Vol 20 (01) ◽  
pp. 1-43 ◽  
Author(s):  
T. LAPPI
Keyword(s):  
Recent Progress ◽  
Initial Conditions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Ion Collisions ◽  
Initial Stage ◽  
Small X ◽  
Rhic Data

This is a review of applications of the Color Glass Condensate (CGC) to the phenomenology of relativistic heavy-ion collisions. The initial stages of the collision can be understood in terms of the nonperturbatively strong nonlinear glasma color fields. We discuss how the CGC framework can and has been used to compute properties of the initial conditions of AA collisions. In particular this has led to recent progress in understanding multiparticle correlations, which can provide a directly observable signal of the properties of the initial stage of the collision process.

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