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Measurement of the forward backward asymmetry in Z --> b anti-b and Z --> c anti-c decays with leptons

ALEPH Collaboration, The and Heister, A. and Bouhova-Thacker, Evelina and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2002) Measurement of the forward backward asymmetry in Z --> b anti-b and Z --> c anti-c decays with leptons. European Physical Journal C: Particles and Fields, 24 (2). pp. 177-191. ISSN 1434-6044

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Abstract

The sample of hadronic Z decays collected by the Aleph detector at Lep in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z→bb¯ and Z→cc¯ events and the B0−B¯0 average mixing parameter χ¯ . Quark charges are tagged by the charges of electrons and muons produced in b and c semileptonic decays. Multivariate analyses are used to separate the event flavours and b→ℓ / b→c→ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ¯=0.1196±0.0049(stat.)+0.0043−0.0050(syst.),A0,bFB=0.0998±0.0040(stat.)±0.0017(syst.),A0,cFB=0.0732±0.0053(stat.)±0.0037(syst.). These asymmetries, combined with the Aleph measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin2θeffW=0.23188±0.00046 .

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63919
Deposited By: ep_importer_pure
Deposited On: 03 May 2013 10:21
Refereed?: Yes
Published?: Published
Last Modified: 17 Nov 2017 11:24
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63919

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