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\title{\boldmath{ $Z^0$}\ \ \ \ \ \ \ $*****$}
\maketitle
The $Z^0$ is neutral electroweak gauge boson. The mass and width are taken from \cite{Yao:2006px}. The branching ratios are calculated using the decayer together with a factor $(1+\alpha_S/\pi)$ for the quark modes. The $Z^0$ is allowed to be off-shell by ten times the width.
The $Z^0$ has mass $91187.6$~MeV and is unstable. The $Z^0$ has spin $1$, charge $0$ and is colour neutral.
 The $Z^0$ is a gauge boson.
The $Z^0$ has width $2495.2$~MeV. The lower limit on the mass of the particle is $24952$~MeV and the upper limit is $24952$~MeV. These are the deviations from the on-shell value. The branching ratios are fixed.
The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The PDG code is 23.
\setlongtables
\begin{longtable}[t]{|c|c|c|p{1in}|p{2.5in}|c|}
\hline
Branching & Rating & On/ & Outgoing  & Description & Decayer  \\ 
Ratio     &                                 & Off & Particles &             &         \\ 
\hline
\endhead
\caption{The decay modes of the $Z^0$ (continues).}
\endfoot
\caption{The decay modes of the $Z^0$.}
\endlastfoot
\label{tab:23decaymodes}
0.153812 & $*****$ & on & $ d, \bar{d} $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.153811 & $*****$ & on & $ s, \bar{s} $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.152457 & $*****$ & on & $ b, \bar{b} $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.119279 & $*****$ & on & $ u, \bar{u} $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.119162 & $*****$ & on & $ c, \bar{c} $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.066897 & $*****$ & on & $ \nu_e, \bar{\nu}_e $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.066897 & $*****$ & on & $ \nu_\mu, \bar{\nu}_\mu $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.066897 & $*****$ & on & $ \nu_\tau, \bar{\nu}_\tau $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.033621 & $*****$ & on & $ e^-, e^+ $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.033621 & $*****$ & on & $ \mu^-, \mu^+ $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
0.033546 & $*****$ & on & $ \tau^-, \tau^+ $  & Decay of $Z^0$ with calculated branching ratio.   & Herwig::SMWZ::WZ \\ 
\hline
\end{longtable}The $Z^0$ decay modes are given in Table~\ref{tab:23decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|ZMass| for the $Z^0$.
The width generator is \verb|ZWidth| for the $Z^0$.

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 The particle was checked by Peter Richardson at 20:39:6 on the 20th of October 2007. The most recently changed decay mode was modified at 21:32:26 on the 15th of August 2005. The particle data was last modified at 16:24:39 on the 10th of October 2006.

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