Small-x effects in forward-jet production at HERA

We investigate small-x effects in forward-jet production at HERA in the two-hard-scale region kT ~ Q>>Lambda_QCD. We show that, despite describing different energy regimes, both a BFKL parametrization and saturation parametrizations describe well the H1 and ZEUS data for dsigma/dx published a few years ago. This is confirmed when comparing the predictions to the latest data.Comment: 4 pages, 2 figures, Proceedings of the XIIIth International Workshop on Deep Inelastic Scattering (DIS05), Madison, Wisconsin, USA, April 27-May 1 200

Azimuthal correlations of forward dijets in d+Au collisions at RHIC

Measuring correlations between forward dijets in deuteron-gold collisions at RHIC will further test the Color Glass Condensate (CGC) picture of the nuclear wavefunction at small-x, which successfully predicted the suppressed production of high-p_T particles at forward rapidities in d+Au collisions: R_dA<1. I present predictions for the correlation in azimuthal angle between forward dijets in the CGC framework, with both multiple scatterings and non-linear QCD evolution at small-x taken into account.Comment: 4 pages, 1 figure, Proceedings of the 20th International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (QM08), Jaipur, India, February 4-10 200

Particle production and saturation at HERA

Perturbative QCD in the high-energy limit describes the evolution of scattering amplitudes with increasing energy towards and into the so-called saturation regime. Comparisons of the predictions with experimental data for a number of observables led to significant progress and understanding. We discuss the case of particle-production cross-sections measured at HERA and argue that these measurements have the potential to provide evidence for the saturation regime of QCD.Comment: 6 pages, 4 figures, Proceedings of the XXXVth International Symposium on Multiparticle Dynamics (ISMD05), Kromeriz, Czech Republic, August 9-15 200

Open questions in QCD at high parton density

I present the state of our understanding of the QCD dynamics at play in the parton saturation regime of nuclear wave functions. I explain what are the biggest open questions in the field, their intrinsic interest, but also why is it important to answer them from the quark-gluon-plasma physicists' perspective. Focusing on those aspects that proton-nucleus collisions cannot investigate to a satisfactory degree, I show that future high-energy electron-ion colliders have the potential to address these questions, providing thorough answers in most cases, and exploratory measurements otherwise.Comment: 8 pages, 9 figures, Proceedings of the 23rd International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (QM12), Washington DC, USA, August 13-18 201

The high-energy limit of inclusive and diffractive deep inelastic scattering in QCD

Following recent progresses in the understanding of high-energy scattering in QCD, we derive the first phenomenological consequences of Pomeron loops, in the context of both inclusive and diffractive deep inelastic scattering. In particular, we discuss diffusive scaling, a new scaling law that emerges for sufficiently high energies and up to very large values of $Q^2,$ well above the proton saturation momentum.Comment: 4 pages, 3 figures, Proceedings of the XIVth International Workshop on Deep Inelastic Scattering (DIS06), Tsukuba, Japan, April 20-24 200

Azimuthal correlations of forward di-hadrons in d+Au collisions suppressed by saturation

RHIC experiments have recently measured the azimuthal correlation function of forward di-hadrons. The data show a disappearance of the away-side peak in central d+Au collisions, compared to p+p collisions, as was predicted by saturation physics. Indeed, we argue that this effect, absent at mid-rapidity, is a consequence of the small-x evolution into the saturation regime of the Gold nucleus wave function. We show that the data are well described in the Color Glass Condensate framework.Comment: 6 pages, 1 figure, Proceedings of the XXXVth International Conference on High Energy Physics (ICHEP2010), Paris, France, July 22-28 201