Colour reconnection studies in e(+)e(-)-> W+W- at root s=183 GeV

Authors
Abbiendi, G Ackerstaff, K Alexander, G Allison, J Altekamp, N Anderson, KJ Anderson, S Arcelli, S Asai, S Ashby, SF Axen, D Azuelos, G Ball, AH Barberio, E Barlow, RJ Bartoldus, R Batley, JR Baumann, S Bechtluft, J Behnke, T Bell, KW Bella, G Bellerive, A Bentvelsen, S Bethke, S Betts, S Biebel, O Biguzzi, A Bird, SD Blobel, V Bloodworth, IJ Bock, P Bohme, J Bonacorsi, D Boutemeur, M Braibant, S Bright-Thomas, P Brigliadori, L Brown, RM Burckhart, HJ Capiluppi, P Carnegie, RK Carter, AA Carter, JR Chang, CY Charlton, DG Chrisman, D Ciocca, C Clarke, PEL Clay, E Cohen, I Conboy, JE Cooke, OC Couyoumtzelis, C Coxe, RL Cuffiani, M Dado, S Dallavalle, GM Davis, R De Jong, S de Roeck, A Dervan, P Desch, K Dienes, B Dixit, MS Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Eatough, D Estabrooks, PG Etzion, E Fabbri, F Fanti, M Faust, AA Fiedler, F Fierro, M Fleck, I Folman, R Furtjes, A Futyan, DI Gagnon, P Gary, JW Gascon, J Gascon-Shotkin, SM Gaycken, G Geich-Gimbel, C Giacomelli, G Giacomelli, P Gibson, V Gibson, WR Gingrich, DM Glenzinski, D Goldberg, J Gorn, W Grandi, C Graham, K Gross, E Grunhaus, J Gruwe, M Hanson, GG Hansroul, M Hapke, M Harder, K Harel, A Hargrove, CK Hartmann, C Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Herndon, M Herten, G Heuer, RD Hildreth, MD Hill, JC Hobson, PR Hoch, M Hocker, A Hoffman, K Homer, RJ Honma, AK Horvath, D Hossain, KR Howard, R Huntemeyer, P Igo-Kemenes, P Imrie, DC Ishii, K Jacob, FR Jawahery, A Jeremie, H Jimack, M Jones, CR Jovanovic, P Junk, TR Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Kayal, PI Keeler, RK Kellogg, RG Kennedy, BW Kim, DH Klier, A Kluth, S Kobayashi, T Kobel, M Koetke, DS Kokott, TP Kolrep, M Komamiya, S Kowalewski, RV Kress, T Krieger, P von Krogh, J Kuhl, T Kyberd, P Lafferty, GD Landsman, H Lanske, D Lauber, J Lautenschlager, SR Lawson, I Layter, JG Lazic, D Lee, AM Lellouch, D Letts, J Levinson, L Liebisch, R List, B Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, MJ Ludwig, J Liu, D Macchiolo, A Macpherson, A Mader, W Mannelli, M Marcellini, S Markopoulos, C Martin, AJ Martin, JP Martinez, G Mashimo, T Mattig, P McDonald, WJ McKenna, J Mckigney, EA McMahon, TJ McPherson, RA Meijers, F Menke, S Merritt, FS Mes, H Meyer, J Michelini, A Mihara, S Mikenberg, G Miller, DJ Mir, R Mohr, W Montanari, A Mori, T Nagai, K Nakamura, I Neal, HA Nellen, B Nisius, R O'Neale, SW Oakham, FG Odorici, F Ogren, HO Oreglia, MJ Orito, S Palinkas, J Pasztor, G Pater, JR Patrick, GN Patt, J Perez-Ochoa, R Petzold, S Pfeifenschneider, P Pilcher, JE Pinfold, J Plane, DE Poffenberger, P Polok, J Przybycien, M Rembser, C Rick, H Robertson, S Robins, SA Rodning, N Roney, JM Roscoe, K Rossi, AM Rozen, Y Runge, K Runolfsson, O Rust, DR Sachs, K Saeki, T Sahr, O Sang, WM Sarkisyan, EKG Sbarra, C Schaile, AD Schaile, O Scharf, F Scharff-Hansen, P Schieck, J Schmitt, B Schmitt, S Schoning, A Schroder, M Schumacher, M Schwick, C Scott, WG Seuster, R Shears, TG Shen, BC Shepherd-Themistocleous, CH Sherwood, P Siroli, GP Sittler, A Skuja, A Smith, AM Snow, GA Sobie, R Soldner-Rembold, S Spagnolo, S Sproston, M Stahl, A Stephens, K Steuerer, J Stoll, K Strom, D Strohmer, R Surrow, B Talbot, SD Taras, P Tarem, S Teuscher, R Thiergen, M Thomas, J Thomson, MA von Torne, E Torrence, E Towers, S Trigger, I Trocsanyi, Z Tsur, E Turcot, AS Turner-Watson, MF Ueda, I Van Kooten, R Vannerem, P Verzocchi, M Voss, H Wackerle, F Wagner, A Ward, CP Ward, DR Watkins, PM Watson, AT Watson, NK Wells, PS Wermes, N White, JS Wilson, GW Wilson, JA Wyatt, TR Yamashita, S Yekutieli, G Zacek, V Zer-Zion, D
Citation
G. Abbiendi et al., Colour reconnection studies in e(+)e(-)-> W+W- at root s=183 GeV, PHYS LETT B, 453(1-2), 1999, pp. 153-168
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
453
Issue
1-2
Year of publication
1999
Pages
153 - 168
Database
ISI
SICI code
0370-2693(19990429)453:1-2<153:CRSIEW>2.0.ZU;2-J
Abstract
The predicted effects of final state interactions such as colour reconnecti on are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of root s similar or equal to 182.7 Ge V in the OPAL detector at LEP. Dependence on the modelling of hadronic W de cays is avoided by comparing W+W- --> q (q) over bar q (q) over bar events with the non-leptonic component of W+W- --> q (q) over bar'l<(nu)over bar>( l) events. The scaled momentum distribution, its mean value, [x(p)], and th at of the charged particle multiplicity, [n(ch)], are measured and found to be consistent in the two channels. The measured differences are: Delta[n(ch)] = [n(ch)(4q)] - 2[n(ch)(qql nu)] = + 0.7 +/- 0.8 +/- 0.6 Delta[x(p)] = [x(p)(4q)] - [x(p)(qql nu)] = (- 0.09 +/- 0.09 +/- 0.05) X 10 (-2) In addition, measurements of rapidity and thrust are performed for W+W- --> q (q) over bar'q (q) over bar' events. The data are described well by stan dard QCD models and disfavour one model of colour reconnection within the A RIADNE program. The current implementation of the Ellis-Geiger model of col our reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables s tudied. The predicted effect of colour reconnection on OPAL measurements of M-W is also quantified in the context of models studied. (C) 1999 Publishe d by Elsevier Science B.V. All rights reserved.