A short review of some double-parton scattering processes

TL;DR

This review discusses double parton scattering processes, emphasizing charm quark pair production as a key probe, and explores mechanisms, energy dependence, and applications to jet and W boson production.

Contribution

It provides a concise overview of double parton scattering mechanisms, highlights the importance of charm pair production, and discusses the role of perturbative parton splitting.

Findings

Charm pair production is a key process to study DPS effects.

Perturbative parton splitting significantly contributes to DPS.

DPS effects are relevant in four-jet and W boson production.

Abstract

A few examples of quickly developing field of double parton scattering are discussed. We present arguments that the production of two pairs of charm quark-antiquark is the golden reaction to study the double parton scattering effects. We discuss briefly also mechanism of single parton scattering and show that it gives much smaller contribution to the $c \bar c c \bar c$ final state. In this context we discuss also the contribution of perturbative parton-splitting mechanism which should also be added to the conventional DPS mechanism. The presence of the letter leads to collision energy and other kinematical variables dependence of so-called $\sigma_{eff}$. We briefly discuss production of four jets. We concentrate on estimation of the contribution of DPS for jets widely separated in rapidity. Finally we briefly mention about DPS effects in production of $W^+ W^-$.