Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/9609
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 Computer Engineering Research Papers

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