Search for chargino and neutralino production at root s=189 GeV at LEP

Authors
Abbiendi, G Ackerstaff, K Alexander, G Allison, J Anderson, KJ Anderson, S Arcelli, S Asai, S Ashby, SF Axen, D Azuelos, G Ball, AH Barberio, E Barlow, RJ Batley, JR Baumann, S Bechtluft, J Behnke, T Bell, KW Bella, G Bellerive, A Bentvelsen, S Bethke, S Betts, S Biebel, O Biguzzi, A Bloodworth, IJ Bock, P Bohme, J Boeriu, O Bonacorsi, D Boutemeur, M Braibant, S Bright-Thomas, P Brigliadori, L Brown, RM Burkhart, 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 Couchman, J Couyoumtzelis, C Coxe, RL Cuffiani, M Dado, S Dallavalle, GM Dallison, S Davis, R De Jong, S de Roeck, A Dervan, P Desch, K Dienes, B Dixit, MS Donkers, M Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Estabrooks, PG Etzion, E Fabbri, F Fanfani, A Fanti, M Faust, AA Feld, L Ferrari, P Fiedler, F Fierro, M Fleck, I Frey, A Furtjes, A Futyan, DI Gagnon, P Gary, JW Gaycken, G Geich-Gimbel, C Giacomelli, G Giacomelli, P Gibson, WR Gingrich, DM Glenzinski, D Goldberg, J Gorn, W Grandi, C Graham, K Gross, E Grunhaus, J Gruwe, M Hajdu, C Hanson, GG Hansroul, M Hapke, M Harder, K Harel, A Hargrove, CK Harin-Dirac, M Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Herten, G Heuer, RD Hildreth, MD Hill, JC Hobson, PR 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 Kanaya, N Kanzaki, J Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Kayal, PI Keeler, RK Kellogg, RG Kennedy, BW Kim, DH Klier, A Kobayashi, T Kobel, M 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 Lawson, I Layter, JG Lellouch, D Letts, J Levinson, L Liebisch, R Lillich, J List, B Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, J Lu, J Ludwig, J Liu, D Macchiolo, A Macpherson, A Mader, W Mannelli, M Marcellini, S Marchant, TE Martin, AJ Martin, JP Martinez, G Mashimo, T Mattig, P McDonald, WJ Mckenna, J Mckigney, EA McMahon, TJ McPherson, RA Meijers, F Mendez-Lorenzo, P Merritt, FS Mes, H Meyer, I 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 Ogren, HO Okpara, A Oreglia, MJ Orito, S 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 Przybycien, M Quadt, A Rembser, C Rick, H Robertson, S Robins, SA Rodning, N Roney, JM Rosati, S 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 Scharff-Hansen, P Schieck, J 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 Skuja, A Smith, AM Snow, GA Sobie, R Soldner-Rembold, S Spagnolo, S Sproston, M Stahl, A Stephens, K Stoll, K Strom, D Strohmer, R Surrow, B Talbot, SD Taras, P Tarem, S Teuscher, R Thiergen, M Thomas, J Thomson, MA Torrence, E Towers, S Trefzger, T Trigger, I Trocsanyi, Z Tsur, E Turner-Watson, MF Ueda, I Van Kooten, R Vannerem, P Verzocchi, M Voss, H Wackerle, F Wagner, A Waller, D Ward, CP Ward, DR Watkins, PM Watson, AT Watson, NK Wells, PS Wermes, N Wetterling, D White, JS Wilson, GW Wilson, JA Wyatt, TR Yamashita, S Zacek, V Zer-Zion, D
Citation
G. Abbiendi et al., Search for chargino and neutralino production at root s=189 GeV at LEP, EUR PHY J C, 14(2), 2000, pp. 187-198
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
14
Issue
2
Year of publication
2000
Pages
187 - 198
Database
ISI
SICI code
1434-6044(200005)14:2<187:SFCANP>2.0.ZU;2-S
Abstract
A search for charginos and neutralinos, predicted by supersymmetric theorie s, is performed using a data sample of 182.1 pb(-1) taken at a centre-of-ma ss energy of 189 GeV with the OPAL detector at LEP. No evidence for chargin o or neutralino production is found. Upper limits on chargino and neutralin o pair production (<(chi)over tilde>(+)(1)<(chi)over tilde>(-)(1), <(chi)ov er tilde>(0)(1)<(chi)over tilde>(0)(2)) cross-sections are obtained as a fu nction of the chargino mass (m(chi 1)(+/-)), the lightest neutralino mass ( m(chi 1)(0)) and the second lightest neutralino mass (m(chi 2)(0)). Within the Constrained Minimal Supersymmetric Standard Model framework, and for m( chi 1)(+/-) - m(chi 1)(0) greater than or equal to 5 GeV, the 95% confidenc e level lower limits on m(chi 1)(-/+) are 93.6 GeV for tan beta = 1.5 and 9 4.1 GeV for tan beta = 35. These limits are obtained assuming a universal s calar mass m(0) greater than or equal to 500 GeV. The corresponding limits for all m(0) are 78.0 and 71.7 GeV. The 95% confidence level lower limits o n the lightest neutralino mass, valid for any value of tan beta are 32.8 Ge V for m(0) greater than or equal to 500 GeV and 31.6 GeV for all m(0).