Measurement of isolated prompt photon production in photon photon collisions at s(ee)**(1/2) = 183 GeV - 209-GeV

For the first time at LEP the production of prompt photons is studied in the collisions of quasi-real photons using the OPAL data taken at e+e- centre-of-mass energies between 183 GeV and 209 GeV. The total inclusive production cross-section for isolated prompt photons in the kinematic range of photon transverse momentum larger than 3.0 GeV and absolute photon pseudorapidity less than 1 is determined to be 0.32 +- 0.04 (stat) +- 0.04 (sys) pb. Differential cross-sections are compared to the predictions of a next-to-leading-order (NLO) calculation.

Note:

28 pages, 11 figures, Submitted to Eur. Phys. J C Report-no: CERN-EP/2003-023

electron positron: colliding beams
exchange: two-photon
photon photon: interaction
photon: direct production
event shape analysis: cluster
jet: associated production
channel cross section
differential cross section: transverse momentum
rapidity dependence
quantum chromodynamics: perturbation theory

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