Analysis of hadronic final states and the photon structure function F2 (gamma) in deep inelastic electron - photon scattering at LEP

Deep inelastic electron-photon scattering is studied in the Q2 ranges from 6 to 30 GeV2 and from 60 to 400 GeV2 using the full sample of LEP data taken with the OPAL detector at centre-of-mass energies close to the Z0 mass, with an integrated luminosity of 156.4 pb−1. Energy flow distributions and other properties of the measured hadronic final state are compared with the predictions of Monte Carlo models, including HERWIG and PYTHIA. Sizeable differences are found between the data and the models, especially at low values of the scaling variable x. New measurements are presented of the photon structure function

F_2^{αmma }(x,Q^2)

, allowing for the first time for uncertainties in the description of the final state by different Monte Carlo models. The differences between the data and the models contribute significantly to the systematic errors on

F_2^{αmma }

. The slope

{⤪ d}(F_2^{αmma }/←pha )/{⤪ d ln} Q^2

is measured to be

0.13_{-0.04}^{+0.06}

.

electron positron: colliding beams
photon electron: deep inelastic scattering
hadron: electroproduction
photon: structure function
transverse energy
energy flow
dependence: momentum transfer
structure function: slope
rapidity dependence
angular dependence

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