Measurements of R-b in e( )e(-) colisions at root s between 182 and 209 GeV

G Abbiendi; C Ainsley; PF Akesson; G Alexander; J Allison; P Amaral; G Anagnostou; KJ Anderson; S Asai; D Axen; I Bailey; E Barberio; T Barillari; RJ Barlow; RJ Batley; P Bechtle; T Behnke; KW Bell; PJ Bell; G Bella; A Bellerive; G Benelli; S Bethke; O Biebel; O Boeriu; P Bock; M Boutemeur; S Braibant; RM Brown; HJ Burckhart; S Campana; RK Carnegie; AA Carter; JR Carter; CY Chang; DG Charlton; C Ciocca; A Csilling; M Cuffiani; S Dado; A De Roeck; EA De Wolf; K Desch; M Dienes; M Donkers; J Dubbert; E Duchovni; G Duckeck; IP Duerdoth; E Etzion; F Fabbri; A Fanfani; P Ferrari; F Fiedler; I Fleck; M Ford; A Frey; P Gagnon; JW Gary; C Geich-Gimbel; G Giacomelli; P Giacomelli; M Giunta; J Goldberg; E Gross; J Grunhaus; M Gruwe; PO Gunther; A Gupta; C Hajdu; M Hamann; GG Hanson; A Harel; M Hauschild; CM Hawkes; R Hawkings; RJ Hemingway; G Herten; RD Heuer; JC Hill; K Hoffman; D Horvath; P Igo-Kemenes; K Ishii; H Jeremie; P Jovanovic; TR Junk; J Kanzaki; D Karlen; K Kawagoe; T Kawamoto; RK Keeler; RG Kellogg; BW Kennedy; S Kluth; T Kobayashi; M Kobel; S Komamiya; T Kramer; P Krieger; J von Krogh; T Kuhl; M Kupper; GD Lafferty; H Landsman; D Lanske; D Lellouch; J Letts; L Levinson; J Lillich; SL Lloyd; FK Loebinger; J Lu; A Ludwig; J Ludwig; W Mader; S Marcellini; AJ Martin; G Masetti; T Mashimo; P Mattig; J McKenna; RA McPherson; F Meijers; W Menges; FS Merritt; H Mes; N Meyer; A Michelini; S Mihara; G Mikenberg; DJ Miller; W Mohr; A Montanari; T Mori; A Mutter; K Nagai; I Nakamura; H Nanjo; HA Neal; R Nisius; SW O'Neal; A Oh; MJ Oreglia; S Orito; C Pahl; G Pasztor; JR Pater; JE Pilcher; J Pinfold; DE Plane; O Pooth; M Przybycien; A Quadt; K Rabbertz; C Rembser; P Renkel; JM Roney; Y Rozen; K Runge; K Sachs; T Saeki; EKG Sarkisyan; AD Schaile; P Scharff-Hansen; J Schieck; T Schorner-Sadenius; M Schroder; M Schumacher; R Seuster; TG Shears; BC Shen; P Sherwood; A Skuja; AM Smith; R Sobie; S Soldner-Rembold; F Spano; A Stahl; D Strom; R Strohmer; S Tarem; M Tasevsky; R Teuscher; MA Thomson; E Torrence; D Toya; P Tran; I Triggerg; Z Trocsany; E Tsur; ME Turner-Watson; I Ueda; B Ujvari; CF Vollmer; P Vannerem; R Vertesi; M Verzocchi; H Voss; J Vossebeld; CP Ward; DR Ward; PM Watkins; AT Watson; NK Watson; PS Wells; T Wengler; N Wermes; GW Wilson; JA Wilson; G Wolf; TR Wyatt; S Yamashita; D Zer-Zion

Journal article

Measurements of R-b in e( )e(-) colisions at root s between 182 and 209 GeV

G Abbiendi, C Ainsley, PF Akesson, G Alexander, J Allison, P Amaral, G Anagnostou, KJ Anderson, S Asai, D Axen, I Bailey, E Barberio, T Barillari, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell, G Bella Show all

PHYSICS LETTERS B | ELSEVIER SCIENCE BV | Published : 2005

DOI: 10.1016/j.physletb.2005.01.031

Abstract

Measurements of Rb, the ratio of the bb̄ cross-section to the qq̄ cross-section in e+e- collisions, are presented. The data were collected by the OPAL experiment at LEP at centre-of-mass energies between 182 and 209 GeV. Lepton, lifetime and event-shape information is used to tag events containing b quarks with high efficiency. The data are compatible with the Standard Model expectation. The mean ratio of the eight measurements reported here to the Standard Model prediction is 1.055±0.031±0.037, where the first error is statistical and the second systematic. © 2005 Elsevier B.V. All rights reserved.