Measurement of the low-x behaviour of the photon structure function \(F_2^\gamma\)
2000
The
photon structure function\(F_2^\gamma(x,Q^2)\) has been measured using data taken by the OPAL detector at \(\rm e^+e^-\) centre-of-mass energies of 91 GeV, 183 GeVand 189 \GeV, in \(Q^2\) ranges of 1.5–30.0 GeV\(^2\) (LEP1), and 7.0–30.0 GeV\(^2\) (LEP2), probing lower values of x than ever before. Since previous OPAL analyses, new Monte Carlo models and new methods, such as multi-variable unfolding, have been introduced, reducing significantly the model dependent
systematic errorsin the measurement. The results do not conclusively prove, but are completely consistent with, the presence of a rise in \(F_2^\gamma\) at low-x as expected from QCD.
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