| Title: | DI-JET PRODUCTION IN PHOTON-PHOTON COLLISIONS AT  FROM 189 TO 209 GEV |
| DOI No: | 10.1142/9789812777157_0012 |
| Source: | PHOTON 2001 (pp 62-66)
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| Author(s): | THORSTEN WENGLER
CERN, EP-Division, 1211 Geneva 23, Switzerland
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| Abstract: | Di-jet production is studied in collisions of quasi-real photons radiated by the LEP beams at e+e- centre-of-mass energies  from 189 to 209 GeV. The data have been taken with the OPAL detector. Jets are reconstructed using a k⊥-clustering algorithm. The inclusive di-jet cross-section is measured as a function of the mean transverse energy  of the two jets, and as a function of xγ for different regions of  . Furthermore the inclusive di-jet cross-section as a function of │ηjet│ and │Δηjet│ is presented, where ηjet is the jet pseudo-rapidity. Different regions of the  -space are explored to study and control the influence of a possible underlying event. The results are compared to next-to-leading order perturbative QCD calculations and to the predictions of the leading order Monte Carlo generator PYTHIA. |
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