Inclusive Jet Production in Two-Photon Collisions at LEP

TL;DR

This paper measures inclusive jet production in two-photon collisions at LEP, finding that the cross section at high transverse momentum exceeds NLO QCD predictions, indicating potential areas for theoretical improvement.

Contribution

First measurement of inclusive jet cross sections in two-photon collisions at LEP energies using a k_t algorithm, highlighting discrepancies with NLO QCD at high pt.

Findings

Measured cross section follows a power law.

High pt cross section exceeds NLO QCD predictions.

Results suggest need for refined theoretical models.

Abstract

Inclusive jet production, e+e- -> e+e- \ee$ jet X, is studied using 560/pb of data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 209 GeV. The inclusive differential cross section is measured using a k_t jet algorithm as a function of the jet transverse momentum, pt, in the range 3<pt<50 GeV for a pseudorapidity, eta, in the range -1<eta<1. This cross section is well represented by a power law. For high pt, the measured cross section is significantly higher than the NLO QCD predictions, as already observed for inclusive charged and neutral pion production.