# Direct photons and dileptons via color dipoles

## TL;DR

This paper presents a unified color dipole approach to describe Drell-Yan dilepton and direct photon production, incorporating non-perturbative effects and DGLAP evolution, successfully matching experimental data across various energies.

## Contribution

It introduces a parameter-free formalism within the color dipole model that unifies the description of dilepton and photon production processes, including non-perturbative effects and evolution.

## Key findings

- Accurately describes dilepton spectra at 800 GeV pp collisions.
- Successfully models direct photon spectra at RHIC and Tevatron energies.
- Provides a unified, parameter-free framework for these processes.

## Abstract

Drell-Yan dilepton pair production and inclusive direct photon production can be described within a unified framework in the color dipole approach. The inclusion of non-perturbative primordial transverse momenta and DGLAP evolution is studied. We successfully describe data for dilepton spectra from 800-GeV pp collisions, inclusive direct photon spectra for pp collisions at RHIC energies $\sqrt{s}=200$ GeV, and for $p\bar{p}$ collisions at Tevatron energies $\sqrt{s}=1.8$ TeV, in a formalism that is free from any extra parameters.