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A study of W+W-gamma events at LEP

Abbiendi, G and Ainsley, C and Akesson, P F and Alexander, G and Allison, J and Amaral, P and Anagnostou, G and Anderson, K J and Arcelli, S and Asai, S and Axen, D and Azuelos, G and Bailey, I and Barberio, E and Barlow, R J and Batley, R J and Bechtle, P and Behnke, T and Bell, K W and Bell, P J and Bella, G and Bellerive, A and Benelli, G and Bethke, S and Biebel, O and Boeriu, O and Bock, P and Boutemeur, M and Braibant, S and Brigliadori, L and Brown, R M and Buesser, K and Burckhart, H J and Campana, S and Carnegie, R K and Caron, B and Carter, A A and Carter, J R and Chang, C Y and Charlton, D G and Csilling, A and Cuffiani, M and Dado, S and De Roeck, A and De Wolf, E A and Desch, K and Dienes, B and Donkers, M and Dubbert, J and Duchovni, E and Duckeck, G and Duerdoth, I P and Etzion, E and Fabbri, F and Feld, L and Ferrari, P and Fiedler, E and Fleck, I and Ford, M and Frey, A and Furtjes, A and Gagnon, P and Gary, J W and Gaycken, G and Geich-Gimbel, C and Giacomelli, G and Giacomelli, P and Giunta, M and Goldberg, J and Gross, E and Grunhaus, J and Gruwe, M and Gunther, P O and Gupta, A and Hajdu, C and Hamann, M and Hanson, G G and Harder, K and Harel, A and Harin-Dirac, M and Hauschild, M and Hawkes, C M and Hawkings, R and Hemingway, R J and Hensel, C and Herten, G and Heuer, R D and Hill, J C and Hoffman, K and Horvath, D and Igo-Kemenes, P and Ishii, K and Jeremie, H and Jovanovic, P and Junk, T R and Kanaya, N and Kanzaki, J and Karapetian, G and Karlen, D and Kawagoe, K and Kawamoto, T and Keeler, R K and Kellogg, R G and Kennedy, B W and Kim, D H and Klein, K and Klier, A and Kluth, S and Kobayashi, T and Kobel, M and Komamiya, S and Kormos, L and Kramer, T and Krieger, P and von Krogh, J and Kruger, K and Kuhl, T and Kupper, M and Lafferty, G D and Landsman, H and Lanske, D and Layter, J G and Leins, A and Lellouch, D and Letts, J and Levinson, L and Lillich, J and Lloyd, S L and Loebinger, F K and Lu, J and Ludwig, J and Macpherson, A and Mader, W and Marcellini, S and Martin, A J and Masetti, G and Mashimo, T and Mattig, P and McDonald, W J and McKenna, J and McMahon, T J and McPherson, R A and Meijers, F and Menges, W and Merritt, F S and Mes, H and Michelini, A and Mihara, S and Mikenberg, G and Miller, D J and Moed, S and Mohr, W and Mori, T and Mutter, A and Nagai, K and Nakamura, I and Nanjo, H and Neal, H A and Nisius, R and O'Neale, S W and Oh, A and Okpara, A and Oreglia, M J and Orito, S and Pahl, C and Pasztor, G and Pater, J R and Patrick, G N and Pilcher, J E and Pinfold, J and Plane, D E and Poli, B and Polok, J and Pooth, O and Przybycien, M and Quadt, A and Rabbertz, K and Rembser, C and Renkel, P and Roney, J M and Rosati, S and Rozen, Y and Runge, K and Sachs, K and Saeki, T and Sarkisyan, E K G and Schaile, A D and Schaile, O and Scharff-Hansen, P and Schieck, J and Schorner-Sadenius, T and Schroder, M and Schumacher, M and Schwick, C and Scott, W G and Seuster, R and Shears, T G and Shen, B C and Sherwood, P and Siroli, G and Skuja, A and Smith, A M and Sobie, R and Soldner-Rembold, S and Spano, F and Stahl, A and Stephens, K and Strom, D and Strohmer, R and Tarem, S and Tasevsky, M and Taylor, R J and Teuscher, R and Thomson, M A and Torrence, E and Toya, D and Tran, P and Trigger, I and Trocsanyi, Z and Tsur, E and Turner-Watson, M F and Ueda, I and Ujvari, B and Vollmer, C F and Vannerem, P and Vertesi, R and Verzocchi, M and Voss, H and Vossebeld, J and Waller, D and Ward, C P and Ward, D R and Watkins, P M and Watson, A T and Watson, N K and Wells, P S and Wengler, T and Wermes, N and Wetterling, D and Wilson, G W and Wilson, J A and Wolf, G and Wyatt, T R and Yamashita, S and Zer-Zion, D and Zivkovic, L and , OPAL Collaboration (2004) A study of W+W-gamma events at LEP. Physics Letters B, 580 (1-2). pp. 17-36. ISSN 0370-2693

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Abstract

A study of W+W- events accompanied by hard photon radiation, Egamma > 2.5 GeV, produced in e(+)e(-) collisions at LEP is presented. Events consistent with being two on-shell W-bosons and an isolated photon are selected from 681 pb(-1) of data recorded at 180 GeV < roots < 209 GeV. From the sample of 187 selected W(+)W(-)gamma candidates with photon energies greater than 2.5 GeV, the W(+)W(-)gamma cross-section is determined at five values of roots. The results are consistent with the Standard Model expectation. Averaging over all energies, the ratio of the observed cross-section to the Standard Model expectation is R(data/SM) = 0.99 +/- 0.09 +/- 0.04, where the errors represent the statistical and systematic uncertainties respectively. These data provide constraints on the related O(alpha) systematic uncertainties on the measurement of the W-boson mass at LEP. Finally, the data are used to derive 95% confidence level upper limits on possible anomalous contributions to the W(+)W(-)gammagamma and W(+)W(-)Z(0)y vertices: -0.020 GeV-2 < a(0)/Lambda(2) < 0.020 GeV-2, -0.053 GeV-2 < a(c)/Lambda(2) < 0.037 GeV-2, -0.16 GeV-2 < a(n)/Lambda(2) < 0.15 GeV-2, where Lambda represents the energy scale for new physics and a(0), a(c) and a(n) are dimensionless coupling constants. (C) 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: GAUGE-BOSON COUPLINGS ; W-PAIR PRODUCTION ; PRODUCTION CROSS-SECTION ; QUARTIC ANOMALOUS COUPLINGS ; E(+)E(-) COLLISIONS ; MONTE-CARLO ; RADIATIVE-CORRECTIONS ; BRANCHING FRACTIONS ; E+E ANNIHILATION ; ENERGIES
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Physics
ID Code: 52310
Deposited By: ep_importer_pure
Deposited On: 12 Jan 2012 14:44
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52310

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