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Color-glass condensate

About: Color-glass condensate is a research topic. Over the lifetime, 885 publications have been published within this topic receiving 35169 citations.


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TL;DR: In this paper, the relevant component of the hadron wavefunction can be described as a color glass condensate, i.e., a state of high density gluonic matter whose distribution is random, but frozen over the relevant time scales.
Abstract: At very high energies, the relevant component of the hadron wavefunction can be described as a Color Glass Condensate, i.e., a state of high density gluonic matter whose distribution is random, but frozen over the relevant time scales. The weight function for this distribution obeys a renormalization group equation in the form of a functional Fokker-Planck equation. Its solution leads to an effective theory which predicts gluon saturation at sufficiently high energy, or small Bjorken's $x$.

2 citations

01 Dec 2004
TL;DR: In this paper, the scaling behavior of the nucleon structure functions in the Bjorken limit found natural interpretation in terms of scattering on point-like, spin 1/2 objects -partons.
Abstract: The deep inelastic scattering experiments in which leptons probe nucleons with the help of electroweak bosons revealed the partonic structure of nucleons. In particular, the scaling behavior of the nucleon structure functions in the Bjorken limit found natural interpretation in terms of scattering on pointlike, spin 1/2 objects — partons. These are colored quarks of Quantum Chromodynamics (QCD). However, quarks carry only half of nucleon’s longitudinal momentum. The missing half is provided by gluons to which the electroweak bosons do not directly couple. Thus, although not directly probed, gluons are extremely important for the description of the deep inelastic structure of nucleons. Quantitatively, this is summarized by the DGLAP evolution equations of QCD in which quark and gluon distributions are directly coupled. The sign of scaling violation, @F2/@ logQ 2 at different values of the Bjorken variable x, is determined by a relative contribution of gluons to quarks. In the limit x → 0, studied in the last ten years at HERA, the description of deep inelastic processes is dominated by strongly rising gluon distribution. Therefore, the small x limit corresponds to a study of a partonic system inside of a nucleon which is predominantly formed by gluons. The description of processes in such a system, as seen from the point of view perturbative QCD, is the aim of this presentation. � Presented at the XLIV Cracow School of Theoretical Physics, Zakopane, Poland,

2 citations

Journal ArticleDOI
TL;DR: In this article, the Yang-Mills equations are solved semi-analytically with the solutions having the form of power series expansions in the proper time, and the resulting functional form of the gluon spectrum is exponential in nature and the spectrum is close to a thermal distrubtion with effective temperatures around $ 0.6$ to $0.9\, Q_s$ late in the Glasma evolution.
Abstract: In high energy heavy-ion collisions, the degrees of freedom at the very early stage can be effectively represented by strong classical gluonic fields within the Color Glass Condensate framework. As the system expands, the strong gluonic fields eventually become weak such that an equivalent description using the gluonic particle degrees of freedom starts to become valid. We revisit the spectrum of these gluonic particles by solving the classical Yang-Mills equations semi-analytically with the solutions having the form of power series expansions in the proper time. We propose a different formula for the gluon spectrum which is consistent with energy density during the whole time evolution. We find that the chromo-electric fields have larger contributions to the gluon spectrum than the chromo-magnetic fields do. Furthermore, the large momentum modes take less time to reach the weak-field regime while smaller momentum modes take more time. The resulting functional form of the gluon spectrum is exponential in nature and the spectrum is close to a thermal distrubtion with effective temperatures around $0.6$ to $0.9\, Q_s$ late in the Glasma evolution. The sensitiveness of the gluon spectrum to the infrared and the ultraviolet cut-offs are discussed.

2 citations

Journal ArticleDOI
TL;DR: In this article, the DGLAP evolution for the system of produced gluons in the process of diffractive production in DIS, directly from the evolution equation in Color Glass Condensate approach, is developed.
Abstract: In this paper we develop the DGLAP evolution for the system of produced gluons in the process of diffractive production in DIS, directly from the evolution equation in Color Glass Condensate approach. We are able to describe the available experimental data with small value of the QCD coupling ( $$\bar{\alpha }_S\approx 0.1$$ ). We conclude that in diffractive production, we have a dilute system of emitted gluons and in the order to describe them, we need to develop the next-to-leading order approach in perturbative QCD.

2 citations

Journal ArticleDOI
TL;DR: In this article , a configuration-by-configuration expression for the single inclusive semi-hard gluon production including the first saturation correction was obtained, and it was shown that a resummation of higher-order saturation corrections is required to regulate the infrared region of the Gluon spectrum.
Abstract: In high energy proton-nucleus collisions, the gluon saturation effects from the nucleus are fully incorporated into the light-like Wilson lines. The gluon saturation effects from the proton, which are anticipated to be important either in the extreme high energy limit or towards the dense-dense (nucleus-nucleus) collision regimes, have been studied perturbatively within the Color Glass Condensate effective theory in previous papers of this series. A configuration-by-configuration expression for the single inclusive semi-hard gluon production including the first saturation correction was obtained. In this paper, we perform ensemble averaging in the McLerran-Venugopalan model and the Dipole Approximation. We find that, in the saturation correction, the effects of the initial state interactions are negligible while the final state interactions play most important role and give a positive-valued contribution to the semi-hard gluon spectrum. Furthermore, we show that the single gluon spectrum scales approximately $1/k_{\perp}^{4}$ at small $k_{\perp}$, suggesting that a resummation of higher order saturation corrections is required to regulate the infrared region of the gluon spectrum.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202244
202127
202022
201951
201833