Measurement of the Photon Structure Function F2gamma with the L3 Detector at LEP

TL;DR

This paper reports a measurement of the photon structure function F2gamma using high-energy electron-positron collision data from the L3 detector at LEP, covering a broad range of Q^2 and x values.

Contribution

The study provides the first comprehensive measurement of F2gamma over a wide kinematic range at LEP energies, using a large data set and comparing results with recent parton density functions.

Findings

Measured F2gamma across Q^2=11-34 GeV^2 and x=0.006-0.556.

Data agrees with recent parton density function predictions.

Enhanced understanding of the photon's hadronic structure.

Abstract

The e+e- -> e+e- hadrons reaction, where one of the two electrons is detected in a low polar-angle calorimeter, is analysed in order to measure the hadronic photon structure function F2gamma . The full high-energy and high-luminosity data set, collected with the L3 detector at centre-of-mass energies 189-209GeV, corresponding to an integrated luminosity of 608/pb is used. The Q^2 range 11-34GeV^2 and the x range 0.006-0.556 are considered. The data are compared with recent parton density functions.