Recent Low x and Diffractive Collider Data

TL;DR

This paper reviews recent collider data related to low Bjorken-x QCD phenomena, diffractive interactions, and potential BFKL effects, comparing results from HERA, Tevatron, and LEP to theoretical expectations.

Contribution

It provides a comprehensive overview of recent experimental results on low-x QCD and diffractive processes, discussing their implications for Regge factorisation and BFKL dynamics.

Findings

Evidence for diffractive interactions at colliders

Possible indications of BFKL effects in data

No conclusive evidence of anomalous gamma-gamma cross sections

Abstract

Selected recent data from collider experiments pertaining to the understanding of QCD at low Bjorken-x are reviewed. The status of QCD and Regge factorisation in hard diffractive interactions is discussed in terms of data from HERA and the Tevatron. The possibility of anomalous behaviour in the $\gamma \gamma$ total cross section is confronted with the most recent measurements from LEP. Data from all three colliders that are sensitive to possible BFKL effects are presented and different interpretations are discussed.