Dijet Production in Photon-Photon Collisions at sqrt(s)_ee=161 and 172 GeV

TL;DR

This paper investigates dijet production in photon-photon collisions at LEP energies, comparing experimental measurements with QCD predictions and Monte Carlo simulations to test theoretical models.

Contribution

It provides detailed measurements of dijet production and angular distributions at specific energies, and compares these with next-to-leading order QCD calculations and Monte Carlo models.

Findings

Measured dijet cross-sections agree with NLO QCD within uncertainties.

Angular distributions match theoretical predictions for direct and resolved processes.

Results help validate and refine photon-photon collision models.

Abstract

Dijet production is studied in collisions of quasi-real photons radiated by the LEP beams at e+e- centre-of-mass energies sqrt(s)_ee=161 and 172 GeV. Jets are reconstructed using a cone jet finding algorithm in the range |eta(jet)|<2 and E_T(jet)>3 GeV. The angular distributions of direct and double-resolved processes and the inclusive two-jet cross-section are measured. They are compared to next-to-leading order perturbative QCD calculations and the prediction of the leading order Monte Carlo generators PYTHIA and PHOJET.