The Color glass condensate and high-energy scattering in QCD

By E. Iancu, R. Venugopalan. 2003

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At very high energies or small values of Bjorken x, the density of partons, per unit transverse area, in hadronic wavefunctions becomes very large leading to a saturation of partonic distributions. When the scale corresponding to the density per unit transverse area, the saturation scale Q_s, becomes large (Q_s\gg \Lambda_{QCD}), the coupling constant becomes weak (\alpha_S(Q_s)\ll 1) which suggests that the high energy limit of QCD may be studied using weak coupling techniques. This simple idea can be formalized in an effective theory, the Color Glass Condensate (CGC), which describes the behavior of the small x components of the hadronic wavefunction in QCD. The Green functions of the theory satisfy Wilsonian renormalization group equations which reduce to the standard linear QCD evolution equations in the limit of low parton densities. The effective theory has a rich structure that has been explored using analytical and numerical techniques. The CGC can be applied to study a wide range of high energy scattering experiments from Deep Inelastic Scattering at HERA and the proposed Electron Ion Collider (EIC) to proton/deuterium-nucleus and nucleus-nucleus experiments at the RHIC and LHC colliders.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d88b3ea579927e49b37dcaef647cd0151bc3abdc

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In Nuclear and High Energy Physics

Citations in the corpus

Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “Because of the higher gluon density in the Lorentz-contracted nucleus compared to the proton, the low-x regime of the nucleus is a good place to search for gluon saturation [635].”
Asymptotic perfect fluid dynamics as a consequence of AdS/CFT correspondence (2005, background): “This dual background may be a good starting point to extend the study of saturation effects to strong coupling (as it mimicks closely the setup at the origin of the Colour Glass Condensate/JIMWLK picture [ 23 ]).”
The Muon Puzzle in cosmic-ray induced air showers and its connection to the Large Hadron Collider (2021, methodology): “For introductions to the CGC see Iancu and Venugopalan (2003), Gelis et al. (2010), Dusling et al. (2016).”
Interference effects in medium-induced gluon radiation (2011, methodology): “The background field is assumed to be random, with a Gaussian distribution, and the average over its fluctuations will be performed using techniques borrowed from the color glass condensate [31].”
When does the gluon reggeize? (2013, background): “one by Mueller [7] and Kovchegov [9], not to forget the celebrated and closely-related Weizsacker-Williams approximation. Numerous derivations and presentations are available; we refer the reader to [37,38] and references therein. Equation (2.5) is to be interpreted as the one-loop approximation to ”