CERN Accelerating science

Article
Report number hep-ex/9901019 ; CERN-PPE-98-196 ; CERN-PPE-98-0196 ; CERN-EP-98-196 ; CERN-EP-98-196
Title Colour reconnection studies in $e^{+}e^{-} \to W^{+}W^{-}$ at $\sqrt{s}$=183 GeV
Author(s)

Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; Allison, John ; Altekamp, N. ; Anderson, K.J. ; Anderson, S. ; Arcelli, S. ; Asai, S. ; Ashby, S.F. ; Axen, D. ; Azuelos, G. ; Ball, A.H. ; Barberio, E. ; Barlow, Roger J. ; Bartoldus, R. ; Batley, J.R. ; Baumann, S. ; Bechtluft, J. ; Behnke, T. ; Bell, Kenneth Watson ; Bella, G. ; Bellerive, A. ; Bentvelsen, S. ; Bethke, S. ; Betts, S. ; Biebel, O. ; Biguzzi, A. ; Bird, S.D. ; Blobel, V. ; Bloodworth, I.J. ; Bock, P. ; Bohme, J. ; Bonacorsi, D. ; Boutemeur, M. ; Braibant, S. ; Bright-Thomas, P. ; Brigliadori, L. ; Brown, Robert M. ; Burckhart, H.J. ; Capiluppi, P. ; Carnegie, R.K. ; Carter, A.A. ; Carter, J.R. ; Chang, C.Y. ; Charlton, David G. ; Chrisman, D. ; Ciocca, C. ; Clarke, P.E.L. ; Clay, E. ; Cohen, I. ; Conboy, J.E. ; Cooke, O.C. ; Couyoumtzelis, C. ; Coxe, R.L. ; Cuffiani, M. ; Dado, S. ; Dallavalle, G.Marco ; Davis, R. ; De Jong, S. ; de Roeck, A. ; Dervan, P. ; Desch, K. ; Dienes, B. ; Dixit, M.S. ; Dubbert, J. ; Duchovni, E. ; Duckeck, G. ; Duerdoth, I.P. ; Eatough, D. ; Estabrooks, P.G. ; Etzion, E. ; Fabbri, F. ; Fanti, M. ; Faust, A.A. ; Fiedler, F. ; Fierro, M. ; Fleck, I. ; Folman, R. ; Furtjes, A. ; Futyan, D.I. ; Gagnon, P. ; Gary, J.W. ; Gascon, J. ; Gascon-Shotkin, S.M. ; Gaycken, G. ; Geich-Gimbel, C. ; Giacomelli, G. ; Giacomelli, P. ; Gibson, V. ; Gibson, W.R. ; Gingrich, D.M. ; Glenzinski, D. ; Goldberg, J. ; Gorn, W. ; Grandi, C. ; Graham, K. ; Gross, E. ; Grunhaus, J. ; Gruwe, M. ; Hanson, G.G. ; Hansroul, M. ; Hapke, M. ; Harder, K. ; Harel, A. ; Hargrove, C.K. ; Hartmann, C. ; Hauschild, M. ; Hawkes, C.M. ; Hawkings, R. ; Hemingway, R.J. ; Herndon, M. ; Herten, G. ; Heuer, R.D. ; Hildreth, M.D. ; Hill, J.C. ; Hobson, P.R. ; Hoch, M. ; Hocker, James Andrew ; Hoffman, Kara Dion ; Homer, R.J. ; Honma, A.K. ; Horvath, D. ; Hossain, K.R. ; Howard, R. ; Huntemeyer, P. ; Igo-Kemenes, P. ; Imrie, D.C. ; Ishii, K. ; Jacob, F.R. ; Jawahery, A. ; Jeremie, H. ; Jimack, M. ; Jones, C.R. ; Jovanovic, P. ; Junk, T.R. ; Karlen, D. ; Kartvelishvili, V. ; Kawagoe, K. ; Kawamoto, T. ; Kayal, P.I. ; Keeler, R.K. ; Kellogg, R.G. ; Kennedy, B.W. ; Kim, D.H. ; Klier, A. ; Kluth, S. ; Kobayashi, T. ; Kobel, M. ; Koetke, D.S. ; Kokott, T.P. ; Kolrep, M. ; Komamiya, S. ; Kowalewski, Robert V. ; Kress, T. ; Krieger, P. ; von Krogh, J. ; Kuhl, T. ; Kyberd, P. ; Lafferty, G.D. ; Landsman, H. ; Lanske, D. ; Lauber, J. ; Lautenschlager, S.R. ; Lawson, I. ; Layter, J.G. ; Lazic, D. ; Lee, A.M. ; Lellouch, D. ; Letts, J. ; Levinson, L. ; Liebisch, R. ; List, B. ; Littlewood, C. ; Lloyd, A.W. ; Lloyd, S.L. ; Loebinger, F.K. ; Long, G.D. ; Losty, M.J. ; Ludwig, J. ; Lui, D. ; Macchiolo, A. ; Macpherson, A. ; Mader, W. ; Mannelli, M. ; Marcellini, S. ; Markopoulos, C. ; Martin, A.J. ; Martin, J.P. ; Martinez, G. ; Mashimo, T. ; Mattig, Peter ; McDonald, W.John ; McKenna, J. ; Mckigney, E.A. ; McMahon, T.J. ; McPherson, R.A. ; Meijers, F. ; Menke, S. ; Merritt, F.S. ; Mes, H. ; Meyer, J. ; Michelini, A. ; Mihara, S. ; Mikenberg, G. ; Miller, D.J. ; Mir, R. ; Mohr, W. ; Montanari, A. ; Mori, T. ; Nagai, K. ; Nakamura, I. ; Neal, H.A. ; Nellen, B. ; Nisius, R. ; O'Neale, S.W. ; Oakham, F.G. ; Odorici, F. ; Ogren, H.O. ; Oreglia, M.J. ; Orito, S. ; Palinkas, J. ; Pasztor, G. ; Pater, J.R. ; Patrick, G.N. ; Patt, J. ; Perez-Ochoa, R. ; Petzold, S. ; Pfeifenschneider, P. ; Pilcher, J.E. ; Pinfold, J. ; Plane, David E. ; Poffenberger, P. ; Polok, J. ; Przybycien, M. ; Rembser, C. ; Rick, H. ; Robertson, S. ; Robins, S.A. ; Rodning, N. ; Roney, J.M. ; Roscoe, K. ; Rossi, A.M. ; Rozen, Y. ; Runge, K. ; Runolfsson, O. ; Rust, D.R. ; Sachs, K. ; Saeki, T. ; Sahr, O. ; Sang, W.M. ; Sarkisian, E.K.G. ; Sbarra, C. ; Schaile, A.D. ; Schaile, O. ; Scharf, F. ; Scharff-Hansen, P. ; Schieck, J. ; Schmitt, B. ; Schmitt, S. ; Schoning, A. ; Schroder, Matthias ; Schumacher, M. ; Schwick, C. ; Scott, W.G. ; Seuster, R. ; Shears, T.G. ; Shen, B.C. ; Shepherd-Themistocleous, C.H. ; Sherwood, P. ; Siroli, G.P. ; Sittler, A. ; Skuja, A. ; Smith, A.M. ; Snow, G.A. ; Sobie, R. ; Soldner-Rembold, S. ; Spagnolo, S. ; Sproston, M. ; Stahl, A. ; Stephens, K. ; Steuerer, J. ; Stoll, K. ; Strom, David M. ; Strohmer, R. ; Surrow, B. ; Talbot, S.D. ; Taras, P. ; Tarem, S. ; Teuscher, R. ; Thiergen, M. ; Thomas, J. ; Thomson, M.A. ; von Torne, E. ; Torrence, E. ; Towers, S. ; Trigger, I. ; Trocsanyi, Z. ; Tsur, E. ; Turcot, A.S. ; Turner-Watson, M.F. ; Ueda, I. ; Van Kooten, Rick J. ; Vannerem, P. ; Verzocchi, M. ; Voss, H. ; Wackerle, F. ; Wagner, A. ; Ward, C.P. ; Ward, D.R. ; Watkins, P.M. ; Watson, A.T. ; Watson, N.K. ; Wells, P.S. ; Wermes, N. ; White, J.S. ; Wilson, G.W. ; Wilson, J.A. ; Wyatt, T.R. ; Yamashita, S. ; Yekutieli, G. ; Zacek, V. ; Zer-Zion, D.

Affiliation (CERN)
Publication 1999
Imprint 10 Dec 1998
Number of pages 21
Note 20 pages, LaTeX, 4 eps figures included, submitted to Physics Letters B
In: Phys. Lett. B 453 (1999) 153-8
DOI 10.1016/S0370-2693(99)00309-3
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Free keywords W+ W- ; e+ e-
Abstract The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of sqrt(s)=182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W- -> qqqq events with the non-leptonic component of W+W- -> qqlnu events. The scaled momentum distribution, its mean value, x_p, and that of the charged particle multiplicity, n_ch, are measured and found to be consistent in the two channels. The measured differences are: Diff(x_p) = +0.7 +- 0.8 +- 0.6 and Diff(n_ch) = (-0.09 +- 0.09 +-0.05)*10**-2. In addition, measurements of rapidity and thrust are performed for W+W- -> qqqq events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the ELLIS-GEIGER model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of M_W is also quantified in the context of models studied.
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