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\title{\boldmath{ $\Sigma^0$}\ \ \ \ \ \ \ $*****$}
\maketitle
 The $\Sigma^0$ is the neutral member of the $\Sigma$ isospin triplet. The mass is accurately measured although the error on the lifetime is large. The radiative mode is the only one observed and the $\Lambda e^+e^-$ is calculated from this.
The $\Sigma^0$ has mass $1192.642$~MeV and is unstable. The $\Sigma^0$ has spin $1/2$, charge $0$ and is colour neutral.
 The $\Sigma^0$ is a baryon and is from the $(56,0^+_0)$ $40$plet.The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The decay length is $2.22\times10^{-11}$~m. The PDG code is 3212.
\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 $\Sigma^0$ (continues).}
\endfoot
\caption{The decay modes of the $\Sigma^0$.}
\endlastfoot
\label{tab:3212decaymodes}
0.995000 & $*****$ & on & $ \Lambda^0, \gamma $  & The dominant radiative decay of $\Sigma^0$, branching ratio is given by one minus the branching ratio of the subdominant modes.   & Herwig::SU3BaryonOctetOctetPhoton::SU3Gamma3 \\ 
\hline
0.005000 & $***$ & on & $ \Lambda^0, e^-, e^+ $  & The sub-dominant decay of $\Sigma^0$ with branching ratio from \cite{Yao:2006px}.   & Herwig::Hw64::DecayME0 \\ 
\hline
\end{longtable}The $\Sigma^0$ decay modes are given in Table~\ref{tab:3212decaymodes} and the total branching ratio is $1$.


 There is no mass generator for the $\Sigma^0$.
 There is no width generator for the $\Sigma^0$.

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 The particle was checked by Peter Richardson at 9:37:29 on the 4th of February 2009. The most recently changed decay mode was modified at 21:50:13 on the 21st of July 2005. The particle data was last modified at 16:24:39 on the 10th of October 2006.

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