# $\boldsymbol A{}^{(0,{{\boldsymbol b}})}_{\boldsymbol FB}$ CHARGE ASYMMETRY IN ${{\boldsymbol e}^{+}}$ ${{\boldsymbol e}^{-}}$ $\rightarrow$ ${{\boldsymbol b}}{{\overline{\boldsymbol b}}}$ INSPIRE search

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
$\bf{ 9.92 \pm0.16}$ OUR FIT
$9.58 \pm0.32 \pm0.14$ $91.231$ 1
 2005
DLPH
$10.04 \pm0.56 \pm0.25$ $9.69$ $91.26$ 2
 2004 F
DLPH
$9.72 \pm0.42 \pm0.15$ $9.67$ $91.25$ 3
 2003 P
OPAL
$9.77 \pm0.36 \pm0.18$ $9.69$ $91.26$ 4
 2002 I
OPAL
$9.52 \pm0.41 \pm0.17$ $9.59$ $91.21$ 5
 2002 H
ALEP
$10.00 \pm0.27 \pm0.11$ $9.63$ $\text{91.232}$ 6
 2001 D
ALEP
$7.62 \pm1.94 \pm0.85$ $9.64$ $91.235$ 7
 1999 Y
DLPH
$9.60 \pm0.66 \pm0.33$ $9.69$ $91.26$ 8
 1999 D
L3
$9.31 \pm1.01 \pm0.55$ $9.65$ $91.24$ 9
 1998 U
L3
$9.4 \pm2.7 \pm2.2$ $9.61$ $91.22$ 10
 1997 C
OPAL
• • • We do not use the following data for averages, fits, limits, etc. • • •
$6.37 \pm1.43 \pm0.17$ $5.8$ $89.449$ 1
 2005
DLPH
$10.41 \pm1.15 \pm0.24$ $12.1$ $92.990$ 1
 2005
DLPH
$6.7 \pm2.2 \pm0.2$ $5.7$ $89.43$ 2
 2004 F
DLPH
$11.2 \pm1.8 \pm0.2$ $12.1$ $92.99$ 2
 2004 F
DLPH
$4.7 \pm1.8 \pm0.1$ $5.9$ $89.51$ 3
 2003 P
OPAL
$10.3 \pm1.5 \pm0.2$ $12.0$ $92.95$ 3
 2003 P
OPAL
$5.82 \pm1.53 \pm0.12$ $5.9$ $89.50$ 4
 2002 I
OPAL
$12.21 \pm1.23 \pm0.25$ $12.0$ $92.91$ 4
 2002 I
OPAL
$-13.1 \pm13.5 \pm1.0$ $3.2$ $88.38$ 5
 2002 H
ALEP
$5.5 \pm1.9 \pm0.1$ $5.6$ $89.38$ 5
 2002 H
ALEP
$-0.4 \pm6.7 \pm0.8$ $7.5$ $90.21$ 5
 2002 H
ALEP
$11.1 \pm6.4 \pm0.5$ $11.0$ $92.05$ 5
 2002 H
ALEP
$10.4 \pm1.5 \pm0.3$ $12.0$ $92.94$ 5
 2002 H
ALEP
$13.8 \pm9.3 \pm1.1$ $12.9$ $93.90$ 5
 2002 H
ALEP
$4.36 \pm1.19 \pm0.11$ $5.8$ $\text{89.472}$ 6
 2001 D
ALEP
$11.72 \pm0.97 \pm0.11$ $12.0$ $\text{92.950}$ 6
 2001 D
ALEP
$5.67 \pm7.56 \pm1.17$ $5.7$ $89.434$ 7
 1999 Y
DLPH
$8.82 \pm6.33 \pm1.22$ $12.1$ $92.990$ 7
 1999 Y
DLPH
$6.11 \pm2.93 \pm0.43$ $5.9$ $89.50$ 8
 1999 D
L3
$13.71 \pm2.40 \pm0.44$ $12.2$ $93.10$ 8
 1999 D
L3
$4.95 \pm5.23 \pm0.40$ $5.8$ $89.45$ 9
 1998 U
L3
$11.37 \pm3.99 \pm0.65$ $12.1$ $92.99$ 9
 1998 U
L3
$-8.6 \pm10.8 \pm2.9$ $5.8$ $89.45$ 10
 1997 C
OPAL
$-2.1 \pm9.0 \pm2.6$ $12.1$ $93.00$ 10
 1997 C
OPAL
$-71 \pm34 {}^{+7}_{-8}$ $-58$ $58.3$
 1991
TOPZ
$-22.2 \pm7.7 \pm3.5$ $-26.0$ $35$
 1990 D
CELL
$-49.1 \pm16.0 \pm5.0$ $-39.7$ $43$
 1990 D
CELL
$-28 \pm11$ $-23$ $35$
 1990
TASS
$-16.6 \pm7.7 \pm4.8$ $-24.3$ $35$
 1990
$-33.6 \pm22.2 \pm5.2$ $-39.9$ $44$
 1990
$3.4 \pm7.0 \pm3.5$ $-16.0$ $29.0$
 1989
MAC
$-72 \pm28 \pm13$ $-56$ $55.2$
 1989
AMY
1  ABDALLAH 2005 obtain an enriched samples of ${{\mathit b}}{{\overline{\mathit b}}}$ events using lifetime information. The quark (or antiquark) charge is determined with a neural network using the secondary vertex charge, the jet charge and particle identification.
2  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.
3  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.
4  ABBIENDI 2002I tag ${{\mathit Z}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ decays using a combination of secondary vertex and lepton tags. The sign of the ${{\mathit b}}$-quark charge is determined using an inclusive tag based on jet, vertex, and kaon charges.
5  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.
6  HEISTER 2001D tag ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ events using the impact parameters of charged tracks complemented with information from displaced vertices, event shape variables, and lepton identification. The $\mathit b$-quark direction and charge is determined using the hemisphere charge method along with information from fast kaon tagging and charge estimators of primary and secondary vertices. The change in the quoted value due to variation of $\mathit A{}^{{{\mathit c}}}_{\mathit FB}$ and $\mathit R_{{{\mathit b}}}$ is given as $+0.103$ ($\mathit A{}^{{{\mathit c}}}_{\mathit FB}$ $-$ $0.0651$) $-0.440$ ($\mathit R_{{{\mathit b}}}$ $-$ $0.21585$).
7  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).
8  ACCIARRI 1999D tag ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ events using high p and p$_{\mathit T}$ leptons. The analysis determines simultaneously a mixing parameter $\chi _{{{\mathit b}}}$ = $0.1192$ $\pm0.0068$ $\pm0.0051$ which is used to correct the observed asymmetry.
9  ACCIARRI 1998U tag ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ events using lifetime and measure the jet charge using the hemisphere charge.
10  ALEXANDER 1997C identify the ${\mathit {\mathit b}}$ and ${\mathit {\mathit c}}$ events using a ${{\mathit D}}/{{\mathit D}^{*}}$ tag.
References:
 ABDALLAH 2005
EPJ C40 1 Determination of $\mathit A{}^{b}_{FB}$ at the $\mathit Z$ Pole using Inclusive Charge Reconstruction and Lifetime Tagging
 ABDALLAH 2004F
EPJ C34 109 Measurement of the Forward Backward Asymmetries of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$ using Prompt Leptons
 ABBIENDI 2003P
PL B577 18 Measurement of Heavy Quark Forward Backward Asymmetries and Average ${{\mathit B}}$ Mixing using Leptons in Hadronic ${{\mathit Z}}$ Decays
 ABBIENDI 2002I
PL B546 29 Measurement of the ${\mathit {\mathit b}}$ Quark Forward-Backward Asymmetry Around the ${{\mathit Z}^{0}}$ Peak using an Inclusive Tag
 HEISTER 2002H
EPJ C24 177 Measurement of the Forward-Backward Asymmetry in ${{\mathit Z}}$ $\rightarrow$ ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ and ${{\mathit Z}}$ $\rightarrow$ ${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$
 HEISTER 2001D
EPJ C22 201 Measurement of A${}^{b}_{FB}$ using Inclusive ${{\mathit B}}$ Hadron Decays
 ABREU 1999Y
EPJ C10 219 Measurement of the Forward Backward Asymmetry of ${\mathit {\mathit c}}$ and ${\mathit {\mathit b}}$ Quarks at the ${{\mathit Z}}$ Pole using Reconstructed ${{\mathit D}}$ Mesons
 ACCIARRI 1999D
PL B448 152 Measurement of the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $\rightarrow$ ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ Forward Backward Asymmetry and the ${{\mathit B}^{0}}{{\overline{\mathit B}}^{0}}$ Mixing Parameter using Prompt Leptons
 ACCIARRI 1998U
PL B439 225 Measurement of the Effective Weak Mixing Angle by Jet Charge Asymmetry in Hadronic Decays of the ${{\mathit Z}}$ Boson
 ALEXANDER 1997C
ZPHY C73 379 A Measurement of the Charm and Bottom Forward Backward Asymmetries using ${{\mathit D}}$ Mesons at LEP
 SHIMONAKA 1991
PL B268 457 Measurement of ${\mathit {\mathit b}}$ Quark Forward Backward Charge Asymmetry and Axial-Vector Coupling using Inclusive Muons in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation at $\sqrt {s }$ = 52-61.4 GeV
 BEHREND 1990D
ZPHY C47 333 Heavy Quark Charge Asymmetries with the CELLO Detector
 BRAUNSCHWEIG 1990
ZPHY C48 433 Measurement of the Asymmetry of ${\mathit {\mathit b}}$ Quark Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation of $\sqrt {s }$ = 35 GeV
 ELSEN 1990
ZPHY C46 349 A Measurement of the Weak Axial Couplings of the ${\mathit {\mathit b}}$ and ${\mathit {\mathit c}}$ Quarks
 BAND 1989
PL B218 369 A Measurement of the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ Forward Backward Charge Asymmetry at $\sqrt {s }$ = 29 GeV
 SAGAWA 1989
PRL 63 2341 Measurement of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ Forward Backward Charge Asymmetry between $\sqrt {s }$ = 52 and 57 GeV
 ABDALLAH 2005D
EPJ C44 147 Flavour Independent Searches for Hadronically Decaying Neutral Higgs Bosons
 LEP-SLC 2006
PRPL 427 257 Precision Electroweak Measurements on the ${{\mathit Z}}$ Resonance