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\title{\boldmath{ $\pi^-$}\ \ \ \ \ \ \ $*****$}
\maketitle
The $\pi^-$ is the lightest charged meson. Its mass and lifetime are accurately measured and are taken from \cite{Yao:2006px}. Although it is stable on collider timescales its decay modes are included with branching ratios taken from \cite{Yao:2006px} for completeness. The decay modes including electromagnetic radiation are not explicitly included. The semi-leptonic decay to the neutral pion and an electron, which has a very small branching ratio $~10^{-8}$ has been ignored.
The $\pi^-$ has mass $139.57018$~MeV and is stable. The $\pi^-$ has spin $0$, charge $-1$ and is colour neutral.
 The $\pi^-$ is a meson and is from the $1^1S_0$ multiplet.The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The decay length is $7.8045$~m. The PDG code is -211.
\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 $\pi^-$ (continues).}
\endfoot
\caption{The decay modes of the $\pi^-$.}
\endlastfoot
\label{tab:-211decaymodes}
0.999877 & $*****$ & on & $ \mu^-, \bar{\nu}_\mu $  & The dominant decay of the charged pion to a muon and neutrino.   & Herwig::PScalarLeptonNeutrino::PScalarlnu \\ 
\hline
0.000123 & $*****$ & on & $ e^-, \bar{\nu}_e $  & The subdominant decay of the charged pion to an electron and neutrino.   & Herwig::PScalarLeptonNeutrino::PScalarlnu \\ 
\hline
\end{longtable}The $\pi^-$ decay modes are given in Table~\ref{tab:-211decaymodes} and the total branching ratio is $1$.


 There is no mass generator for the $\pi^-$.
 There is no width generator for the $\pi^-$.

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 The particle was checked by Peter Richardson at 12:17:55 on the 18th of October 2006. The most recently changed decay mode was modified at 23:10:55 on the 3rd of April 2005. The particle data was last modified at 16:24:39 on the 10th of October 2006.

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