Charged multiplicities in Z decays into u, d, and s Quarks

Authors
Abbiendi, G Ainsley, C Akesson, PF Alexander, G Allison, J Anagnostou, G Anderson, KJ Arcelli, S Asai, S Axen, D Azuelos, G Bailey, I Ball, AH Barberio, E Barlow, RJ Behnke, T Bell, KW Bella, G Bellerive, A Benelli, G Bentvelsen, S Bethke, S Biebel, O Bloodworth, IJ Boeriu, O Bock, P Bohme, J Bonacorsi, D Boutemeur, M Braibant, S Bright-Thomas, P Brigliadori, L Brown, RM Burckhart, HJ Cammin, J Capiluppi, P Carnegie, RK Caron, B Carter, AA Carter, JR Chang, CY Charlton, DG Clarke, PEL Clay, E Cohen, I Cooke, OC Couchman, J Coxe, RL Csilling, A Cuffiani, M Dado, S Dallavalle, GM Dallison, S De Roeck, A De Wolf, EA Dervan, P Desch, K Dienes, B Dixit, MS Donkers, M Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Estabrooks, PG Etzion, E Fabbri, F Fanti, M Feld, L Ferrari, P Fiedler, F Fleck, I Ford, M Frey, A Furtjes, A Futyan, DI Gagnon, P Gary, JW Gaycken, G Geich-Gimbel, C Giacomelli, G Giacomelli, P Glenzinski, D Goldberg, J Grandi, C Graham, K Gross, E Grunhaus, J Gruwe, M Gunther, PO Hajdu, C Hanson, GG Harder, K Harel, A Harin-Dirac, M Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Hensel, C Herten, G Heuer, RD Hill, JC Hocker, A Hoffman, K Homer, RJ Honma, AK Horvath, D Hossain, KR Howard, R Huntemeyer, P Igo-Kemenes, P Ishii, K Jacob, FR Jawahery, A Jeremie, H Jones, CR Jovanovic, P Junk, TR Kanaya, N Kanzaki, J Karapentian, G Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Keeler, RK Kellogg, RG Kennedy, BW Kim, DH Klein, K Klier, A Kluth, S Kobayashi, T Kobel, M Kokott, TP Komamiya, S Kowalewski, RV Kress, T Krieger, P von Krogh, J Krop, D Kuhl, T Kupper, M Kyberd, P Lafferty, GD Landsman, H Lanske, D Lawson, I Layter, JG Leins, A Lellouch, D Letts, J Levinson, L Liebisch, R Lillich, J Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, MJ Lu, J Ludwig, J Macchiolo, A Macpherson, A Mader, W Marcellini, S Marchant, TE Martin, AJ Martin, JP Martinez, G Mashimo, T Mattig, P McDonald, WJ Mes, H Michelini, A Mihara, S Mikenberg, G Miller, DJ Mohr, W Montanari, A Mori, T Nagai, K Nakamura, I Neal, HA Nisius, R O'Neale, SW Oakham, FG Odorici, F Oh, A Okpara, A Oreglia, MJ Orito, S Pasztor, G Pater, JR Patrick, GN Pfeifenschneider, P Pilcher, JE Pinfold, J Plane, DE Poli, B Polok, J Pooth, O Przybycien, M Quadt, A Rabbertz, K Rembser, C Renkel, PO Rick, H Rodning, N Roney, JM Rosati, S Roscoe, K Rossi, AM Rozen, Y Runge, K Runolfsson, O Rust, DR Sachs, K Saeki, T Sahr, O Sarkisyan, EKG Sbarra, C Schaile, AD Schaile, O Scharff-Hansen, P Schroder, M Schumacher, M Schwick, C Scott, WG Seuster, R Shears, TG Shen, BC Shepherd-Themistocleous, CH Sherwood, P Siroli, GP Skuja, A Smith, AM Sobie, R Soldner-Rembold, S Spagnolo, S Sproston, M Stahl, A Stephens, K Stoll, K Strom, D Strohmer, R Stumpf, L Surrow, B Talbot, SD Tarem, S Taylor, RJ Teuscher, R Thomas, J Thomson, MA Tonnesmann, M Torrence, E Towers, S Toya, D Trefzger, T Trigger, I Trocsanyi, Z Tsur, E Turner-Watson, MF Ueda, I Vachon, B Vannerem, P Verzocchi, M Voss, H Vossebeld, J Waller, D Ward, CP Ward, DR Watkins, PM Watson, NK Wells, PS Wengler, T Wermes, N Wetterling, D White, JS Wilson, GW Wilson, JA Wyatt, TR Yamashita, S Zacek, V Zer-Zion, D
Citation
G. Abbiendi et al., Charged multiplicities in Z decays into u, d, and s Quarks, EUR PHY J C, 19(2), 2001, pp. 257-268
Citations number
50
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
19
Issue
2
Year of publication
2001
Pages
257 - 268
Database
ISI
SICI code
1434-6044(200102)19:2<257:CMIZDI>2.0.ZU;2-J
Abstract
About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detecto r at LEP at a centre-of-mass energy of around roots = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light qua rk flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposit e to these particles. An unfolding procedure is applied to obtain these mul tiplicities for each primary light quark flavour. This yields [n(u)] = 17.77 +/- 0.51(-1.20)(+0.86), [n(d)] = 21.44 +/- 0.63(-1.17)(+1.46 ), [n(s)] = 20.02 +/- 0.13(-0.37)(+0.39), where statistical and systematic errors are given. The results for [n(u)] a nd [n(d)] are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong inter action for the particle multiplicities in events from the light up, down, a nd strange quarks.