Fluctuations, saturation, and diffractive excitation in high energy collisions

2010/04/30 by Christoffer Flensburg, Gösta Gustafson · 26 citations
Physics and Astronomy · #Dipole #Excitation #Formalism (music) #Hadron #High energy #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pomeron #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Saturation (graph theory) #hep-ph

paper · pdf · doi:10.1007/jhep10(2010)014

published in Journal of High Energy Physics 2010(10) (Springer Nature) · 20 pages, 12 figures

arxiv created 2010/08/25 · openalex publication_date 2010/10/01 · arxiv updated 2010/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Diffractive excitation is usually described by the Good--Walker formalism for low masses, and by the triple-Regge formalism for high masses. In the Good--Walker formalism the cross section is determined by the fluctuations in the interaction. In this paper we show that by taking the fluctuations in the BFKL ladder into account, it is possible to describe both low and high mass excitation by the Good--Walker mechanism. In high energy pp collisions the fluctuations are strongly suppressed by saturation, which implies that pomeron exchange does not factorise between DIS and pp collisions. The Dipole Cascade Model reproduces the expected triple-Regge form for the bare pomeron, and the triple-pomeron coupling is estimated.

Citations

• Hadronic Diffraction: Where do we Stand?
• Renormalization of hadronic diffraction and the structure of the pomeron
• Energy conservation and saturation in small-xevolution
• On the high energy behaviour of the total cross section in the QCD dipole model
• Diffusive scaling and the high-energy limit of deep inelastic scattering in QCD at large

Cited by

• Total, inelastic and (quasi-)elastic cross sections of high energy pA and gamma-A reactions with the dipole formalism