@article{aa181a2bf0674869b43daa7ed9e546f9,
title = "Measurement of QED structure functions of the photon using azimuthal correlations at LEP",
abstract = "We have studied azimuthal correlations in singly-tagged e+e- → e+e-μ+μ- events at an average Q2 of 5.2 GeV2. The data were taken with the OPAL detector at LEP at e+e- centre-of-mass energies close to the Z0 mass, with an integrated luminosity of approximately 100 pb-1. The azimuthal correlations are used to extract the ratio FB γ/F2 γ of the QED structure functions FB γ(x, Q2) and F2 γ(x, Q2) of the photon. In leading order and neglecting the muon mass FB γ is expected to be identical to the longitudinal structure function FL γ. The measurement of FB γ/F2 γ is found to be significantly different from zero and to be consistent with the QED prediction.",
author = "{The OPAL Collaboration} and K. Ackerstaff and G. Alexander and J. Allison and N. Altekamp and K. Ametewee and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and J. Bechtluft and C. Beeston and T. Behnke and Bell, {A. N.} and Bell, {K. W.} and G. Bella and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and V. Blobel and Bloodworth, {I. J.} and Bloomer, {J. E.} and M. Bobinski and P. Bock and Bosch, {H. M.} and M. Boutemeur and Bouwens, {B. T.} and S. Braibant and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. B{\"u}rgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and D. Chrisman and Clarke, {P. E.L.} and I. Cohen and Conboy, {J. E.} and R. Folman",
note = "Funding Information: Acknowledgements. We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator and for their continuing close co-operation with our experimental group. We thank John H. Field and Mike Seymour for valuable discussions. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israel Science Foundation, administered by the Israel Academy of Science and Humanities, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Mon-busho International Science Research Program, German Israeli Bi-national Science Foundation (GIF), Direction des Sciences de la Mati{\`e}re du Commissariat {\`a} l{\textquoteright}Energie Atomique, France, Bundesministerium f{\"u}r Bildung, Wissenschaft, Forschung und Technologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research, OTKA T-016660, and OTKA F-015089.",
year = "1997",
month = mar,
day = "1",
doi = "10.1007/s002880050369",
language = "English",
volume = "74",
pages = "49--55",
journal = "Zeitschrift fur Physik C-Particles and Fields",
issn = "0170-9739",
publisher = "Springer New York",
number = "1",
}