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

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The process e(+)e(-) --> e(+)e(-)Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of roots = 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) over cap, (t) over cap, and (u) over cap 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 egamma --> eZ/gamma* are derived.


Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalEuropean Physical Journal C
Issue number1
Publication statusPublished - 1 May 2002