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

OUR FIT is obtained using the fit procedure and correlations as determined by the LEP Electroweak Working Group (see the note The ${{\mathit Z}}$ boson'' and ref. LEP-SLC 2006 ). For the ${{\mathit Z}}$ peak, we report the pole asymmetry defined by (3/4)$\mathit A_{{{\mathit e}}}\mathit A_{{{\mathit \tau}}}$ as determined by the nine-parameter fit to cross-section and lepton forward-backward asymmetry data.
ASYMMETRY ${\mathrm {(\%)}}$ STD. MODEL $\sqrt {\mathit s }$ ${\mathrm {(GeV)}}$ DOCUMENT ID TECN
$\bf{ 1.88 \pm0.17}$ OUR FIT
$1.45 \pm0.30$ $1.57$ $91.2$ 1
 2001 A
OPAL
$2.41 \pm0.37$ $1.57$ $91.2$
 2000 F
DLPH
$2.60 \pm0.47$ $1.57$ $91.2$
 2000 C
L3
$1.70 \pm0.28$ $1.57$ $91.2$ 2
 2000 C
ALEP
• • • We do not use the following data for averages, fits, limits, etc. • • •
$-32.8 {}^{+6.4}_{-6.2} \pm1.5$ $-32.1$ $56.9$ 3
 1990 I
VNS
$-8.1 \pm2.0 \pm0.6$ $-9.2$ $35$
 1990
$-18.4 \pm19.2$ $-24.9$ $52.0$ 4
 1989
AMY
$-17.7 \pm26.1$ $-29.4$ $55.0$ 4
 1989
AMY
$-45.9 \pm16.6$ $-31.2$ $56.0$ 4
 1989
AMY
$-49.5 \pm18.0$ $-33.0$ $57.0$ 4
 1989
AMY
$-20 \pm14$ $-25.9$ $53.3$
 1988 C
TOPZ
$-10.6 \pm3.1 \pm1.5$ $-8.5$ $34.7$
 1988
MRKJ
$-8.5 \pm6.6 \pm1.5$ $-15.4$ $43.8$
 1988
MRKJ
$-6.0 \pm2.5 \pm1.0$ $8.8$ $34.6$
 1985 F
$-11.8 \pm4.6 \pm1.0$ $14.8$ $43.0$
 1985 F
$-5.5 \pm1.2 \pm0.5$ $-0.063$ $29.0$
 1985
MAC
$-4.2 \pm2.0$ $0.057$ $29$
 1983
MRK2
$-10.3 \pm5.2$ $-9.2$ $34.2$
 1982
CELL
$-0.4 \pm6.6$ $-9.1$ $34.2$
 1982 C
TASS
1  ABBIENDI 2001A error includes approximately 0.26 due to statistics and 0.14 due to event selection systematics.
2  BARATE 2000C error includes approximately $0.26$ due to statistics and $0.11$ due to experimental systematics.
3  ABE 1990I measurements in the range 50 ${}\leq{}$ $\sqrt {\mathit s }{}\leq{}$ $60.8$ GeV.
4  BACALA 1989 systematic error is about 5$\%$.
References:
 ABBIENDI 2001A
EPJ C19 587 Precise Determination of the ${{\mathit Z}}$ Resonance Parameters at LEP: Zedometry''
 ABREU 2000F
EPJ C16 371 Cross Sections and Leptonic Forward-Backward Asymmetries from the ${{\mathit Z}^{0}}$ Running of LEP
 ACCIARRI 2000C
EPJ C16 1 Measurements of Cross Sections and Forward Backward Asymmetries at the ${{\mathit Z}}$ Resonance and Determination of Electroweak Parameters
 BARATE 2000C
EPJ C14 1 Measurement of the ${{\mathit Z}}$ Resonance Parameters at LEP
 ABE 1990I
ZPHY C48 13 Measurement of the Reactions ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ between $\sqrt {s }$ = 50 and 60.8 GeV
 HEGNER 1990
ZPHY C46 547 Final Results on ${{\mathit \mu}}$ and ${{\mathit \tau}}$ Pair Production by the JADE Collaboration at PETRA
 BACALA 1989
PL B218 112 Measurement of Cross Sections and Charge Asymmetry for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ for $\sqrt {s }$ from 52 to 57 GeV
PL B208 319 Charge Asymmetry Measurement in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ and ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ Reactions at $\sqrt {s }$ = 52 and 55 GeV
PR D38 2665 Electroweak Studies in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions: 12 $<$ $\sqrt {s }$ $<$ 46.78 GeV
PRL 54 1624 Measurement of ${{\mathit \tau}}$ Lifetime and Branching Ratios
PRL 51 1941 Weak Neutral Currents in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ = 29 GeV
PL 114B 282 Measurement of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ at High Energies and Properties of the ${{\mathit \tau}}$ Lepton
PL 110B 173 Charge Asymmetry and Weak Interaction Effects in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$
PRPL 427 257 Precision Electroweak Measurements on the ${{\mathit Z}}$ Resonance