Abstract

Inclusive jet production, e+e−→e+e− jet X, is studied using 560 pb−1 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 kt jet algorithm as a function of the jet transverse momentum, pt, in the range 3<pt<50 GeV for a pseudorapidity, η, in the range −1<η<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 π± and π0 production.

Highlights

  • Two-photon collisions are the main source of hadron production in the high-energy regime of LEP via the process e+e- ^ e+e- Y*Y* ^ e+e- hadrons

  • Hadrons w ith high transverse m om entum are produced by the direct QED process 7 *7 * ^ qq or by QCD processes originating from the partonic content of the photon

  • Next-to-leading order (NLO) QCD calculations are available [1, 2] for inclusive jet production in quasi-real tw o-photon interactions

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Summary

Introduction

Two-photon collisions are the main source of hadron production in the high-energy regime of LEP via the process e+e- ^ e+e- Y*Y* ^ e+e- hadrons. Hadrons w ith high transverse m om entum are produced by the direct QED process 7 *7 * ^ qq or by QCD processes originating from the partonic content of the photon. Next-to-leading order (NLO) QCD calculations are available [1, 2] for inclusive jet production in quasi-real tw o-photon interactions. The L3 Collaboration published results on inclusive n 0, KS [3] and charged hadron [4] pro­ duction in quasi-real two-photon collisions. The jets are measured in the transverse m om entum range 3 < pt < 50 GeV and in the pseudo-rapidity interval |n| < 1. The analysis of jet production allows a com par­ ison of the measurements to NLO QCD predictions, expected to be largely independent of fragmentation functions and hadronisation models

D ata and M onte Carlo
Event selection
Jet definition and com position
Findings
Differential cross section
Full Text
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