Diffractive Bremsstrahlung in Hadronic Collisions

TL;DR

This paper reviews diffractive bremsstrahlung processes in high-energy hadronic collisions, highlighting the breakdown of QCD factorization due to soft-hard interaction interplay, which impacts phenomenological modeling.

Contribution

It introduces a comprehensive analysis of diffractive channels using the color dipole approach, emphasizing the factorization breakdown in these processes.

Findings

Significant breakdown of diffractive QCD factorization observed.

Soft-hard interaction interplay dominates diffractive processes.

Implications for phenomenological studies of high-energy collisions.

Abstract

Production of heavy photons (Drell-Yan), gauge bosons, Higgs bosons, heavy flavors, which is treated within the QCD parton model as a result of hard parton-parton collision, can be considered as a bremsstrahlung process in the target rest frame. In this review, we discuss the basic features of the diffractive channels of these processes in the framework of color dipole approach. The main observation is a dramatic breakdown of diffractive QCD factorisation due to the interplay between soft and hard interactions, which dominates these processes. This observation is crucial for phenomenological studies of diffractive reactions in high-energy hadronic collisions.