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# Measurement of the $e^+ e^- \to Z \to b\overline{b}$ forward-backward asymmetry and the $B^{0}\overline{B}^0$ mixing parameter using prompt leptons

3 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : The time-integrated $\mathrm{B}^{0}\bar{\mathrm{B}}^{0}$ mixing parameter and the forward-backward charge asymmetry in the process $\mathrm{e}^{+}\mathrm{e}^{-} \rightarrow \mathrm{b}\bar{\mathrm{b}}$ are measured in hadronic \Z events containing prompt muons or electrons, collected by the L3 experiment in the years 1990 to 1995. The total sample of 3.3 million hadronic $\mathrm{Z}$ events with a mean centre-of-mass energy of 91.26 GeV yields: \begin{eqnarray*} \mbox{$A_{\mathrm{FB}}^{\mathrm{b} }$} & = & 0.0960 \pm 0.0066(stat.) \pm 0.0033(sys.) \,, \\ %corel-6 \mbox{$\chi_{\mathrm{b}}$} & = & 0.1192 \pm 0.0068(stat.) \pm 0.0051(sys.) \,. % \end{eqnarray*} %%% %%% %%% %%% This asymmetry measurement together with measurements at energies away from the $\mathrm{Z}$ pole energy yield a pole asymmetry and corresponding effective electroweak mixing angle of: \begin{eqnarray*} \mbox{$A_{\mathrm{FB}}^{0,\mathrm{b}}$} & = & 0.1015 \pm 0.0064(stat.) \pm 0.0035(sys.) \,, \\ %corel-6.nb \mbox{$\sin^{2}\bar{\theta}_{\mathrm{W}}$} & = & 0.2318 \pm 0.0013 \, .\\ %sin2tw-3.nb \end{eqnarray*}
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http://hal.in2p3.fr/in2p3-00003513
Contributor : Sylvie Flores <>
Submitted on : Tuesday, March 16, 1999 - 9:08:47 AM
Last modification on : Friday, December 4, 2020 - 1:22:16 PM
Long-term archiving on: : Friday, May 29, 2015 - 4:21:55 PM

### Citation

M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, et al.. Measurement of the $e^+ e^- \to Z \to b\overline{b}$ forward-backward asymmetry and the $B^{0}\overline{B}^0$ mixing parameter using prompt leptons. Physics Letters B, Elsevier, 1999, 448, pp.152-162. ⟨10.1016/S0370-2693(98)01601-3⟩. ⟨in2p3-00003513⟩

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