# ${{\boldsymbol Z}}$ HADRONIC POLE CROSS SECTION 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 ). This quantity is defined as

$\sigma{}{}^{0}_{\mathit h}$ = ${12 {{\mathit \pi}}\over \mathit M{}^{2}_{{{\mathit Z}}}}{\Gamma\mathrm {( {{\mathit e}^{+}} {{\mathit e}^{-}} )}~\Gamma\mathrm {({\mathrm {hadrons}})}\over \Gamma {}^{2}_{{{\mathit Z}}}}$

It is one of the parameters used in the ${{\mathit Z}}$ lineshape fit.
VALUE (nb) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 41.541 \pm0.037}$ OUR FIT
$41.501$ $\pm0.055$ 4.10M 1
 2001 A
OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$ GeV
$41.578$ $\pm0.069$ 3.70M
 2000 F
DLPH ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$ GeV
$41.535$ $\pm0.055$ 3.54M
 2000 C
L3 ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$ GeV
$41.559$ $\pm0.058$ 4.07M 2
 2000 C
ALEP ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$ GeV
• • • We do not use the following data for averages, fits, limits, etc. • • •
$42$ $\pm4$ 450
 1989 B
MRK2 ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $89.2 - 93.0$ GeV
1  ABBIENDI 2001A error includes approximately 0.031 due to statistics, 0.033 due to event selection systematics, 0.029 due to uncertainty in luminosity measurement, and 0.011 due to LEP energy uncertainty.
2  BARATE 2000C error includes approximately $0.030$ due to statistics, $0.026$ due to experimental systematics, and $0.025$ due to uncertainty in luminosity measurement.
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
 ABRAMS 1989B
PRL 63 2173 Measurements of ${{\mathit Z}^{0}}$-Boson Resonance Parameters in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation