Measurement of Z/gamma* production in Compton scattering of quasi-real photons

Details Measurement of Z/gamma* production in Compton scattering of quasi-real photons Measurement of Z/gamma* production in Compton scattering of quasi-real photons

2001-07-19

arxiv.org/abs/hep-ex/0107047v1

Eur.Phys.J.C24:1-15,2002

Physics

High Energy Physics

High Energy Physics - Experiment

34 pages, 12 figures, Submitted to Eur. Phys. J. C

Scientific paper

10.1007/s100520100875

The process e+ e- -> e+ e- Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of sqrt(s) = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of the Mandelstam variables s-hat, t-hat, and u-hat are measured and compared with the predictions from the Monte Carlo generators grc4f and PYTHIA. From this, based on a factorisation ansatz, the total and differential cross-sections for the subprocess e gamma -> e Z/gamma* are derived.

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