pdgLive

$\mathit A{}^{(0,{{\mathit c}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$

OUR FIT, which is obtained by a simultaneous fit to several ${{\mathit c}}$- and ${{\mathit b}}$-quark measurements as explained in the note “The ${{\mathit Z}}$ boson” and ref. LEP-SLC 2006, refers to the $\mathbf {{{\mathit Z}} pole}$ asymmetry. The experimental values, on the other hand, correspond to the measurements carried out at the respective energies.

ASYMMETRY ${\mathrm {(\%)}}$

STD. MODEL

$\sqrt {\mathit s }$ ${\mathrm {(GeV)}}$

DOCUMENT ID

TECN

$\bf{ 7.07 \pm0.35}$

OUR FIT

$ 6.31 \pm0.93 \pm0.65 $

$6.35$

$91.26$

DLPH

$ 5.68 \pm0.54 \pm0.39 $

$6.3$

$91.25$

OPAL

$ 6.45 \pm0.57 \pm0.37 $

$6.10$

$91.21$

ALEP

$ 6.59 \pm0.94 \pm0.35 $

$6.2$

$91.235$

DLPH

$ 6.3 \pm0.9 \pm0.3 $

$6.1$

$91.22$

ALEP

$ 6.3 \pm1.2 \pm0.6 $

$6.1$

$91.22$

OPAL

$ 8.3 \pm3.8 \pm2.7 $

$6.2$

$91.24$

L3

• • We do not use the following data for averages, fits, limits, etc. • •

$ 3.1 \pm3.5 \pm0.5 $

$-3.5$

$89.43$

DLPH

$ 11.0 \pm2.8 \pm0.7 $

$12.3$

$92.99$

DLPH

$ -6.8 \pm2.5 \pm0.9 $

$-3.0$

$89.51$

OPAL

$ 14.6 \pm2.0 \pm0.8 $

$12.2$

$92.95$

OPAL

$ -12.4 \pm15.9 \pm2.0 $

$-9.6$

$88.38$

ALEP

$ -2.3 \pm2.6 \pm0.2 $

$-3.8$

$89.38$

ALEP

$ -0.3 \pm8.3 \pm0.6 $

$0.9$

$90.21$

ALEP

$ 10.6 \pm7.7 \pm0.7 $

$9.6$

$92.05$

ALEP

$ 11.9 \pm2.1 \pm0.6 $

$12.2$

$92.94$

ALEP

$ 12.1 \pm11.0 \pm1.0 $

$14.2$

$93.90$

ALEP

$ -4.96 \pm3.68 \pm0.53 $

$-3.5$

$89.434$

DLPH

$ 11.80 \pm3.18 \pm0.62 $

$12.3$

$92.990$

DLPH

$ -1.0 \pm4.3 \pm1.0 $

$-3.9$

$89.37$

ALEP

$ 11.0 \pm3.3 \pm0.8 $

$12.3$

$92.96$

ALEP

$ 3.9 \pm5.1 \pm0.9 $

$-3.4$

$89.45$

OPAL

$ 15.8 \pm4.1 \pm1.1 $

$12.4$

$93.00$

OPAL

$ -12.9 \pm7.8 \pm5.5 $

$-13.6$

$35$

CELL

$ 7.7 \pm13.4 \pm5.0 $

$-22.1$

$43$

CELL

$ -12.8 \pm4.4 \pm4.1 $

$-13.6$

$35$

JADE

$ -10.9 \pm12.9 \pm4.6 $

$-23.2$

$44$

JADE

$ -14.9 \pm6.7 $

$-13.3$

$35$

JADE

¹

ABDALLAH 2004F tag ${{\mathit b}}-$ and ${{\mathit c}}-$quarks using semileptonic decays combined with charge flow information from the hemisphere opposite to the lepton. Enriched samples of ${{\mathit c}}{{\overline{\mathit c}}}$ and ${{\mathit b}}{{\overline{\mathit b}}}$ events are obtained using lifetime information.

²	ABBIENDI 2003P tag heavy flavors using events with one or two identified leptons. This allows the simultaneous fitting of the ${{\mathit b}}$ and ${{\mathit c}}~$quark forward-backward asymmetries as well as the average ${{\mathit B}^{0}}-{{\overline{\mathit B}}^{0}}$ mixing.

³	HEISTER 2002H measure simultaneously ${{\mathit b}}$ and ${{\mathit c}}$ quark forward-backward asymmetries using their semileptonic decays to tag the quark charge. The flavor separation is obtained with a discriminating multivariate analysis.

⁴

ABREU 1999Y tag ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit Z}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$ events by an exclusive reconstruction of several ${{\mathit D}}~$ meson decay modes (${{\mathit D}^{*+}}$, ${{\mathit D}^{0}}$, and ${{\mathit D}^{+}}$ with their charge-conjugate states).

⁵	BARATE 1998O tag ${{\mathit Z}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$ events requiring the presence of high-momentum reconstructed ${{\mathit D}^{*+}}$, ${{\mathit D}^{+}}$, or ${{\mathit D}^{0}}$ mesons.

⁶	ALEXANDER 1997C identify the ${\mathit {\mathit b}}$ and ${\mathit {\mathit c}}$ events using a ${{\mathit D}}/{{\mathit D}^{*}}$ tag.

⁷	ADRIANI 1992D use both electron and muon semileptonic decays.

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