Measurement of the b quark forward-backward asymmetry around the Z0 peak using an inclusive tag

G Abbiendi; C Ainsley; PF Åkesson; G Alexander; J Allison; P Amaral; G Anagnostou; KJ Anderson; S Arcelli; S Asai; D Axen; G Azuelos; I Bailey; E Barberio; RJ Barlow; RJ Batley; P Bechtle; T Behnke; KW Bell; PJ Bell; G Bella; A Bellerive; G Benelli; S Bethke; O Biebel; IJ Bloodworth; O Boeriu; P Bock; D Bonacorsi; M Boutemeur; S Braibant; L Brigliadori; RM Brown; K Buesser; HJ Burckhart; S Campana; RK Carnegie; B Caron; AA Carter; JR Carter; CY Chang; DG Charlton; A Csilling; M Cuffiani; S Dado; GM Dallavalle; S Dallison; A De Roeck; EA De Wolf; K Desch; B Dienes; M Donkers; J Dubbert; E Duchovni; G Duckeck; IP Duerdoth; E Elfgren; E Etzion; F Fabbri; L Feld; P Ferrari; F Fiedler; I Fleck; M Ford; A Frey; A Fürtjes; P Gagnon; JW Gary; G Gaycken; C Geich-Gimbel; G Giacomelli; P Giacomelli; M Giunta; J Goldberg; E Gross; J Grunhaus; M Gruwé; PO Günther; A Gupta; C Hajdu; M Hamann; GG Hanson; K Harder; A Harel; M Harin-Dirac; M Hauschild; J Hauschildt; CM Hawkes; R Hawkings; RJ Hemingway; C Hensel; G Herten; RD Heuer; JC Hill; K Hoffman; RJ Homer; D Horváth; R Howard; P Hüntemeyer; P Igo-Kemenes

Journal article

Measurement of the b quark forward-backward asymmetry around the Z0 peak using an inclusive tag

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

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | Published : 2002

DOI: 10.1016/S0370-2693(02)02594-7

Open access

Abstract

The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 → bb̄ decays were selected using a combination of secondary vertex and lepton tags, and the sign of the b quark charge was determined using an inclusive tag based on jet, vertex and kaon charges. The results, corrected to the quark level, are: AFB b= 0.0582 ± 0.0153 ± 0.0012 at √s = 89.50 GeV, AFB b= 0.0977 ± 0.0036 ± 0.0018 at √s = 91.26 GeV, AFB b= 0.1221 ± 0.0123 ± 0.0025 at √s = 92.91 GeV, where the first error is statistical and the second systematic in each case. Within the framework of the Standard Model, the result is interpreted as a measurement of the effect..

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