Small-x, Diffraction and Vector Mesons

Abstract

This talk discusses recent progress in some topics relevant for deep inelastic scattering at small x. We discuss first differences and similarities between conventional collinear factorization and the dipole picture of deep inelastic scattering. Many of the recent theoretical advances at small x are related to taking calculations in the nonlinear saturation regime to next-to-leading order accuracy in the QCD coupling. On the experimental side significant recent progress has been made in exclusive and diffractive processes, in particular in ultraperipheral nucleus-nucleus collisions.

15 pages, 14 figures. Plenary talk at DIS 2015, Dallas, TX, April 2015

References in corpus (17)

• Universality of Unintegrated Gluon Distributions at small x
• NLO evolution of color dipoles
• The ridge in proton-proton collisions at the LHC
• Resumming double logarithms in the QCD evolution of color dipoles
• Collinearly-improved BK evolution meets the HERA data
• Angular Correlations in Gluon Production at High Energy
• Direct numerical solution of the coordinate space Balitsky-Kovchegov equation at next to leading order
• Single-inclusive particle production in proton-nucleus collisions at next-to-leading order in the hybrid formalism
• Exclusive diffractive processes in electron-ion collisions
• Photon impact factor in the next-to-leading order
• Implementing the exact kinematical constraint in the saturation formalism
• Matching Collinear and Small-x Factorization Calculations for Inclusive Hadron Production in pA Collisions
• Initial state angular asymmetries in high energy p+A collisions: spontaneous breaking of rotational symmetry by a color electric field and C-odd fluctuations
• Next-to-leading order forward hadron production in the small-$x$ regime: rapidity factorization
• Coherent $\psi$(2S) photo-production in ultra-peripheral Pb-Pb collisions at ${\sqrt{s}}_{\mathrm{NN}}$ = 2.76 TeV
• Calculating TMDs of a Large Nucleus: Quasi-Classical Approximation and Quantum Evolution
• Azimuthal harmonics of color fields in a high energy nucleus