@article{b923a94430374fcb9ab823926be4c1da,
title = "Measurement of the W+W-γ cross-section and first direct limits on anomalous electroweak quartic gauge couplings",
abstract = "A study of W+W- events accompanied by hard photon radiation produced in e+e- collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are selected from 183 pb-1 of data recorded at √S = 189 GeV. From these data, 17 W+W- γ candidates are selected with photon energy greater than 10 GeV, consistent with the Standard Model expectation. These events are used to measure the e+e-→ W+W-γ cross-section within a set of geometric and kinematic cuts, σwwγ = 136 ± 37 ± 8 fb, where the first error is statistical and the second systematic. The photon energy spectrum is used to set the first direct, albeit weak, limits on possible anomalous contributions to the W+W- γ and W+W- γZ(o) vertices: -0.070GeV-2 < a(o)/Λ2 < 0.070 GeV-2, -0.13GeV-2 < a(c)/Λ2 < 0.19GeV-2, -0.61GeV-2 < a(n)/Λ2 < 0.57 GeV-2, where A represents the energy scale for new physics. (C) 1999 Published by Elsevier Science B.V.",
author = "{OPAL Collaboration} and G. Abbiendi and K. Ackerstaff and Akesson, {P. F.} and G. Alexander and J. Allison and Anderson, {K. J.} and S. Arcelli and S. Asai and Ashby, {S. F.} and D. Axen and G. Azuelos and I. Bailey and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and Batley, {J. R.} and S. Baumann 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 Bloodworth, {I. J.} and P. Bock and J. B{\"o}hme and O. Boeriu 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 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 C. Ciocca and Clarke, {P. E.L.} and E. Clay and I. Cohen and E. Etzion and J. Grunhaus",
note = "Funding Information: Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, ",
year = "1999",
month = dec,
day = "30",
doi = "10.1016/S0370-2693(99)01357-X",
language = "אנגלית",
volume = "471",
pages = "293--307",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier B.V.",
number = "2-3",
}