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:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3101
Subjects:
?? physics and astronomy (miscellaneous)engineering (miscellaneous) ??
ID Code:
63919
Deposited By:
Deposited On:
03 May 2013 09:21
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2024 13:49