Production of K-S(0) and Lambda in quark and gluon jets from Z(0) decay

Authors
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 Bentvelsen, S Bethke, S Betts, S Biebel, O Biguzzi, A Bird, SD Blobel, V Bloodworth, IJ Bobinski, M Bock, P Bohme, J Boutemeur, M Braibant, S Bright-Thomas, P Brown, RM Burckhart, HJ Burgard, C Burgin, R 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 del Pozo, LA de Roeck, A Desch, K Dienes, B Dixit, MS Doucet, M Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Eatough, D Estabrooks, PG Evans, HG Fabbri, F Fanfani, A Fanti, M Faust, AA Fiedler, F Fierro, M Fischer, HM Fleck, I Folman, R Furtjes, A Futyan, DI Gagnon, P Gary, JW Gascon, J Gascon-Shotkin, SM Geich-Gimbel, C Geralis, T Giacomelli, G Giacomelli, P Gibson, V Gibson, WR Gingrich, DM Glenzinski, D Goldberg, J Gorn, W Grandi, C Gross, E Grunhaus, J Gruwe, M Hanson, GG Hansroul, M Hapke, M Hargrove, CK Hartmann, C Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Herndon, M Herten, G Heuer, RD Hildreth, MD Hill, JC Hillier, SJ Hobson, PR Hocker, A 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 Joly, A Jones, CR Jovanovic, P Junk, TR Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Kayal, PI Keeler, RK Kellogg, RG Kennedy, BW 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 Kyberd, P Lafferty, GD Lanske, D Lauber, J Lautenschlager, SR Lawson, I Layter, JG Lazic, D Lee, AM Lefebvre, E Lellouch, D Letts, J Levinson, L Liebisch, R List, B Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, MJ Ludwig, J Lui, D Macchiolo, A Macpherson, A 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 Poli, B Polok, J Przybzien, 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 Schorner, T 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 Sproston, M Stahl, A Stephens, K Steuerer, J Stockhausen, B Stoll, K Strom, D Strohmer, R Tafirout, R Talbot, SD Tanaka, S Taras, P Tarem, S Teuscher, R Thiergen, M Thomson, MA von Torne, E Torrence, E Towers, S Trigger, I Trocsanyi, Z Tsur, E Turcot, AS Turner-Watson, MF Van Kooten, R Vannerem, P Verzocchi, M Vikas, P 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
K. Ackerstaff et al., Production of K-S(0) and Lambda in quark and gluon jets from Z(0) decay, EUR PHY J C, 8(2), 1999, pp. 241-254
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
8
Issue
2
Year of publication
1999
Pages
241 - 254
Database
ISI
SICI code
1434-6044(199904)8:2<241:POKALI>2.0.ZU;2-M
Abstract
The production of K-S(0) mesons and Lambda baryons in quark and gluon jets has been investigated using two complementary techniques. In the first appr oach, which provides high statistical accuracy, jets were selected using di fferent jet finding algorithms and ordered according to their energy. Produ ction rates were determined taking into account the dependences of quark an d gluon compositions as a function of jet energy as predicted by Monte Carl o models. Selecting three-jet events with the k(perpendicular to) (Durham) jet finder (Y-cut = 0.005), the ratios of K-S(0) and Lambda production rate s in gluon and quark jets relative to the mean charged particle multiplicit y were found to be 1.10 +/- 0.02 +/- 0.02 and 1.41 +/- 0.04 +/- 0.04, respe ctively, where the first uncertainty is statistical and the second is syste matic. In the second approach, a new method of identifying quark jets based on the collimation of energy flow around the jet axis is introduced and wa s used to anti-tag gluon jets in symmetric (Y-shaped) three-jet events. Usi ng the cone jet finding algorithm with a cone size of 30 degrees, the ratio s of relative production rates in gluon and quark jets were determined to b e 0.94 +/- 0.07 +/- 0.07 for K-S(0) and 1.18 +/- 0.10 +/- 0.17 for Lambda. The results of both analyses are compared to the predictions of Monte Carlo models.