Measurement of direct photon pair production cross sections in ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports measurements of direct photon pair production cross sections in proton-antiproton collisions at 1.96 TeV, comparing experimental data with theoretical QCD predictions to test the accuracy of current models.

Contribution

First measurement of differential cross sections for diphoton production at Tevatron energies, providing data to validate and improve QCD predictions and event generators.

Findings

Measured differential cross sections as functions of multiple kinematic variables.

Compared results with perturbative QCD predictions and event generators.

Identified areas of agreement and discrepancy between data and theory.

Abstract

We present a measurement of direct photon pair production cross sections using 4.2 fb-1 of data collected with the D0 detector at the Fermilab Tevatron proton-antiproton Collider. We measure single differential cross sections as a function of the diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons, as well as the double differential cross sections considering the last three kinematic variables in three diphoton mass bins. The results are compared with different perturbative QCD predictions and event generators.