% particle data information automatically produced from the herwig database
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\title{\boldmath{ $a_1^-(1260)$}\ \ \ \ \ \ \ $****$}
\maketitle
The $a_1^-(1260)$ is observed by a number of experiments however there is no consensus about the value for its mass and width. We therefore use the values from \cite{Link:2007fi}  which are in line with other recent measurements. We use variable branching ratios for the $a_1^-(1260)$ and therefore the branching ratios in the decay table which are for the $a_1$ in tau decay are indicative not used in the simulation. As the width is large the $a_1^-(1260)$ is allowed to be off-shell by the width.
The $a_1^-(1260)$ has mass $1240$~MeV and is unstable. The $a_1^-(1260)$ has spin $1$, charge $-1$ and is colour neutral.
 The $a_1^-(1260)$ is a meson and is from the $1^3P_1$ multiplet.The $a_1^-(1260)$ has width $560$~MeV. The lower limit on the mass of the particle is $560$~MeV and the upper limit is $560$~MeV. These are the deviations from the on-shell value. The branching ratios are allowed to vary with the off-shell mass of the particle.
The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The PDG code is -20213.
\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 $a_1^-(1260)$ (continues).}
\endfoot
\caption{The decay modes of the $a_1^-(1260)$.}
\endlastfoot
\label{tab:-20213decaymodes}
0.499099 & $*****$ & on & $ \pi^-, \pi^0, \pi^0 $  & Decay of the $a_1^-(1260)$ to three pions.   & Herwig::a1Simple::a1Simple \\ 
\hline
0.488100 & $*****$ & on & $ \pi^-, \pi^-, \pi^+ $  & Decay of the $a_1^-(1260)$ to three pions.   & Herwig::a1Simple::a1Simple \\ 
\hline
0.006400 & $*****$ & on & $ K^-, K^{*0} $  & Decay of the $a_1^-(1260)$ to three pions.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.006400 & $*****$ & on & $ K^{*-}, K^0 $  & Decay of the $a_1^-(1260)$ to three pions.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.000001 & $****$ & on & $ \pi^-, \gamma $  & Decay of the $a_1^-(1260)$ to a photon and a pion calculated using the partial width from \cite{Yao:2006px} and our total width   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
\end{longtable}The $a_1^-(1260)$ decay modes are given in Table~\ref{tab:-20213decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|a_1+mass| for the $a_1^-(1260)$.
The width generator is \verb|a_1+width| for the $a_1^-(1260)$.

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 The particle was checked by Peter Richardson at 21:28:51 on the 20th of October 2007. The most recently changed decay mode was modified at 15:24:10 on the 15th of August 2007. The particle data was last modified at 15:38:0 on the 15th of August 2007.

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