Title: | A measurement of R(b) using a double tagging method |
Authors: | Abbiendi, G Ackerstaff, K Alexander, G Allison, J Altekamp, N Anderson, KJ Anderson, S Arcelli, S Asai, S Ashby, SF Axen, D Cooke, OC Herten, G Lellouch, D Schmitt, S Letts, J Rodning, N Strohmer, R Charlton, DG Mannelli, M Barberio, E Sproston, M Przybycien, M Fanti, M Nisius, R Hansroul, M Levinson, L Baumann, S Shears, TG Roney, JM Liebisch, R Mes, H Biebel, O Seuster, R Dubbert, J Jeremie, H List, B Soldner-Rembold, S Littlewood, C Towers, S De Jong, S Mihara, S Bethke, S Futyan, DI Perez-Ochoa, R Howard, R Lloyd, AW Brown, RM Stoll, K Lloyd, SL O'Neale, SW Faust, AA Klier, A Loebinger, FK Marcellini, S Long, GD Verzocchi, M Estabrooks, PG Ogren, HO Rembser, C Losty, MJ Couyoumtzelis, C von Torne, E Ludwig, J Petzold, S Gagnon, P Krieger, P Shen, BC Liu, D Pilcher, JE Roscoe, K Bechtluft, J Hill, JC Bloodworth, IJ Grunhaus, J Rick, H Lautenschlager, SR Azuelos, G Macchiolo, A Burckhart, HJ McPherson, RA Chrisman, D Honma, AK Rossi, AM Bonacorsi, D Bell, KW Coxe, RL Neal, HA Kartvelishvili, V Clarke, PEL Mashimo, T Mattig, P Kokott, TP Desch, K Montanari, A Mori, T Batley, JR Palinkas, J Siroli, GP Bentvelsen, S Kawamoto, T McMahon, TJ Rozen, Y Bright-Thomas, P Runge, K Watkins, PM Davis, R Jones, CR Schmitt, B Gruwe, M Voss, H Lanske, D Talbot, SD Markopoulos, C Runolfsson, O Harder, K Carnegie, RK Watson, AT Rust, DR Skuja, A Capiluppi, P Komamiya, S Nakamura, I Sachs, K Conboy, JE Saeki, T Eatough, D Kobayashi, T Sobie, R Hemingway, RJ Trocsanyi, Z Miller, DJ Sahr, O Huntemeyer, P Dado, S Sang, WM Tanaka, S Lauber, J Pater, JR Betts, S Sarkisyan, EKG Fierro, M Kuhl, T Teuscher, R Wackerle, F Sbarra, C Kayal, PI Duckeck, G Schaile, AD Tsur, E Poffenberger, P Carter, AA Schaile, O Turner-Watson, MF Watson, NK Hargrove, CK Menke, S Hillier, SJ Mader, W Wagner, A Gross, E Scharf, F Igo-Kemenes, P Sherwood, P Jovanovic, P Michelini, A Bobinski, M Homer, RJ Hauschild, M Keeler, RK Odorici, F Karlen, D Schwick, C Scott, WG Pfeifenschneider, P Bartoldus, R Steuerer, J Bird, SD Hapke, M Thomson, MA Hawkings, R Oreglia, MJ Shepherd-Themistocleous, CH Wells, PS Hossain, KR Wermes, N Gary, JW Kluth, S Nellen, B Braibant, S Fleck, I Robertson, S del Pozo, LA Schoning, A White, JS Martin, JP Jacob, FR Gascon, J Wilson, GW Ciocca, C Pinfold, J Strom, D Wilson, JA Barlow, RJ Wyatt, TR von Krogh, J Patt, J Cohen, I McKenna, J Etzion, E Yamashita, S Mir, R Kennedy, BW Yekutieli, G de Roeck, A Robins, SA Torrence, E Herndon, M Zacek, V Lawson, I Dixit, MS Folman, R Zer-Zion, D Orito, S Kress, T Bock, P Evans, HG Vannerem, P Jawahery, A OPAL Collaboration Gascon-Shotkin, SM Martinez, G Biguzzi, A Merritt, FS Schieck, J Furtjes, A Macpherson, A Bohme, J Mohr, W Chang, CY Snow, GA Hobson, PR Meyer, J Behnke, T Bellerive, A Tarem, S Oakham, FG Burgard, C Burgin, R Turcot, AS Cuffiani, M Hildreth, MD Martin, AJ Duchovni, E McDonald, WJ Thiergen, M Carter, JR Gaycken, G Mikenberg, G Geich-Gimbel, C Patrick, GN Surrow, B Horvath, D Layter, JG Ward, CP Kobel, M Brigliadori, L Giacomelli, G Schroder, M Nagai, K Giacomelli, P Junk, TR Van Kooten, R Dallavalle, GM Gibson, V Hanson, GG Gibson, WR Polok, J Trigger, I Kawagoe, K Kyberd, P Gingrich, DM Stahl, A Pasztor, G Glenzinski, D Koetke, DS Ward, DR Duerdoth, IP Mckigney, EA Goldberg, J Kolrep, M Lazic, D Gorn, W Blobel, V Plane, DE Ball, AH Lafferty, GD Fiedler, F Bella, G Grandi, C Schumacher, M Heuer, RD Sittler, A Boutemeur, M Lee, AM Scharff-Hansen, P Hocker, A Stephens, K Jimack, M Clay, E Smith, AM Hartmann, C Hawkes, CM Dienes, B Taras, P Imrie, DC Ishii, K Fabbri, F Kellogg, RG Meijers, F Kowalewski, RV |
Keywords: | Particle physics;Gluons;Heavy quarks;Mass tag;Multiplicity;Hadronic Z(0) decays;Microvertex detector;Quark fragmentation;Meson production;TAU-lifetime |
Issue Date: | 1999 |
Publisher: | Springer-Verlag |
Citation: | European Physical Journal C, 1999, 8 (2), pp. 217 - 239 |
Abstract: | The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using displaced secondary vertices, and high momentum electrons and muons. Systematic uncertainties were reduced by measuring the b-tagging efficiency using a double tagging technique. Efficiency correlations between opposite hemispheres of an event are small, and are well understood through comparisons between real and simulated data samples. A value of Rb = 0.2178 +- 0.0011 +- 0.0013 was obtained, where the first error is statistical and the second systematic. The uncertainty on Rc, the fraction of Z to ccbar events in hadronic Z decays, is not included in the errors. The dependence on Rc is Delta(Rb)/Rb = -0.056*Delta(Rc)/Rc where Delta(Rc) is the deviation of Rc from the value 0.172 predicted by the Standard Model. The result for Rb agrees with the value of 0.2155 +- 0.0003 predicted by the Standard Model. |
URI: | http://bura.brunel.ac.uk/handle/2438/9609 |
DOI: | http://dx.doi.org/10.1007/s100529901087 |
ISSN: | 1434-6044 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers
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