@article{c7d471c3658842ff97cdcc295a631bef,
title = "Measurement of the longitudinal cross-section using the direction of the thrust axis in hadronic events at LEP",
abstract = "In the process e+e- → hadrons, one of the effects of gluon emission is to modify the (1 + cos2θ) form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be σL/σtot = 0.0127 ± 0.0016 ± 0.0013 at the parton level, in good agreement with the expectation of QCD computed to script O sign(α2s). Comparisons at the hadron level with Monte Carlo models are presented. The dependence of the longitudinal cross-section on the value of thrust has also been studied, and provides a new test of QCD.",
author = "{The OPAL Collaboration} and G. Abbiendi and K. Ackerstaff and G. Alexander and J. Allison and N. Altekamp and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and Ashby, {S. F.} 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 S. Baumann and J. Bechtluft and T. Behnke and Bell, {K. W.} and G. Bella and A. Bellerive and S. Bentvelsen and S. Bethke and S. Betts and O. Biebel and A. Biguzzi and Bird, {S. D.} and V. Blobel and Bloodworth, {I. J.} and M. Bobinski and P. Bock and J. Bohme and D. Bonacorsi and M. Boutemeur and S. Braibant and P. Bright-Thomas and L. Brigliadori and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. Burgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and R. Folman",
note = "Funding Information: We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator at all energies and for their continuing close cooperation with our experimental group. We thank our colleagues from CEA, DAPNIA/SPP, CE-Saclay for their efforts over the years on the time-of-flight and trigger systems which we continue to use. 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; Benoziyo Center for High Energy Physics; Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program; German Israeli Bi-national Science Foundation (GIF); Bundesministerium f{\"u}r Bildung, Wissenschaft, Forschung und Technologie, Germany; National Research Council of Canada; Research Corporation, USA; Hungarian Foundation for Scientific Research, OTKA T-016660, T023793 and OTKA F-023259.",
year = "1998",
month = nov,
day = "19",
doi = "10.1016/S0370-2693(98)01172-1",
language = "English",
volume = "440",
pages = "393--402",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "3-4",
}