$\bf{
91.1876 \pm0.0021}$

OUR FIT

$91.1852$ $\pm0.0030$ 
4.57M 
^{ 1} 

OPAL 
$91.1863$ $\pm0.0028$ 
4.08M 
^{ 2} 

DLPH 
$91.1898$ $\pm0.0031$ 
3.96M 
^{ 3} 

L3 
$91.1885$ $\pm0.0031$ 
4.57M 
^{ 4} 

ALEP 
• • • We do not use the following data for averages, fits, limits, etc. • • • 
$91.1872$ $\pm0.0033$ 

^{ 5} 

OPAL 
$91.272$ $\pm0.032$ $\pm0.033$ 

^{ 6} 

L3 
$91.1875$ $\pm0.0039$ 
3.97M 
^{ 7} 

L3 
$91.151$ $\pm0.008$ 

^{ 8} 

TOPZ 
$91.74$ $\pm0.28$ $\pm0.93$ 
156 
^{ 9} 

UA2 
$90.9$ $\pm0.3$ $\pm0.2$ 
188 
^{ 10} 

CDF 
$91.14$ $\pm0.12$ 
480 
^{ 11} 

MRK2 
$93.1$ $\pm1.0$ $\pm3.0$ 
24 
^{ 12} 

UA1 
^{1}
ABBIENDI 2001A error includes approximately $2.3$ MeV due to statistics and $1.8$ MeV due to LEP energy uncertainty.

^{2}
The error includes $1.6$ MeV due to LEP energy uncertainty.

^{3}
The error includes $1.8$ MeV due to LEP energy uncertainty.

^{4}
BARATE 2000C error includes approximately $2.4$ MeV due to statistics, $0.2~$MeV due to experimental systematics, and $1.7~$MeV due to LEP energy uncertainty.

^{5}
ABBIENDI 2004G obtain this result using the S$$matrix formalism for a combined fit to their cross section and asymmetry data at the ${{\mathit Z}}$ peak and their data at $130  209$ GeV. The authors have corrected the measurement for the 34 MeV shift with respect to the Breit$$Wigner fits.

^{6}
ACHARD 2004C select ${{\mathit e}^{+}}$ ${{\mathit e}^{}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}}$ events with hard initial$$state radiation. Z decays to ${{\mathit q}}{{\overline{\mathit q}}}$ and muon pairs are considered. The fit results obtained in the two samples are found consistent to each other and combined considering the uncertainty due to ISR modelling as fully correlated.

^{7}
ACCIARRI 2000Q interpret the $\mathit s$dependence of the cross sections and lepton forwardbackward asymmetries in the framework of the Smatrix formalism. They fit to their cross section and asymmetry data at high energies, using the results of Smatrix fits to ${{\mathit Z}}$peak data (ACCIARRI 2000C) as constraints. The $130  189$ GeV data constrains the ${{\mathit \gamma}}/{{\mathit Z}}$ interference term. The authors have corrected the measurement for the $34.1$ MeV shift with respect to the BreitWigner fits. The error contains a contribution of $\pm2.3$ MeV due to the uncertainty on the ${{\mathit \gamma}}{{\mathit Z}}$ interference.

^{8}
MIYABAYASHI 1995 combine their low energy total hadronic crosssection measurement with the ACTON 1993D data and perform a fit using an Smatrix formalism. As expected, this result is below the mass values obtained with the standard BreitWigner parametrization.

^{9}
Enters fit through ${{\mathit W}}/{{\mathit Z}}$ mass ratio given in the ${{\mathit W}}$ Particle Listings. The ALITTI 1992B systematic error ($\pm0.93$) has two contributions: one ($\pm0.92$) cancels in ${\mathit m}_{{{\mathit W}}}/{\mathit m}_{{{\mathit Z}}}$ and one ($\pm0.12$) is noncancelling. These were added in quadrature.

^{10}
First error of ABE 1989 is combination of statistical and systematic contributions; second is mass scale uncertainty.

^{11}
ABRAMS 1989B uncertainty includes 35 MeV due to the absolute energy measurement.

^{12}
ALBAJAR 1989 result is from a total sample of 33 ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{}}$ events.
