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\title{\boldmath{ $a_2^-(1320)$}\ \ \ \ \ \ \ $*****$}
\maketitle
The $a_2^-(1320)$ is the positively charged member of the isospin triplet from the lightest tensor multiplet. The mass and width are taken from \cite{Yao:2006px}. The limit on the off-shellness of the particle is set to twice the width. The decay modes are similar to those in EvtGen apart from the modelling of $\omega\pi\pi$ as $\omega\rho$ and the inclusion of the $\eta'\pi$ mode.
The $a_2^-(1320)$ has mass $1318.3$~MeV and is unstable. The $a_2^-(1320)$ has spin $2$, charge $-1$ and is colour neutral.
 The $a_2^-(1320)$ is a meson and is from the $1^3P_2$ multiplet.The $a_2^-(1320)$ has width $107$~MeV. The lower limit on the mass of the particle is $214$~MeV and the upper limit is $214$~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 -215.
\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 $a_2^-(1320)$ (continues).}
\endfoot
\caption{The decay modes of the $a_2^-(1320)$.}
\endlastfoot
\label{tab:-215decaymodes}
0.348989 & $*****$ & on & $ \pi^-, \rho^0 $  & The decay of $a_2^-(1320)$ to a rho and a pion, the branching ratio is from \cite{Yao:2006px} with a minor change to ensure the branching ratios sum to unity. This is half the rate from \cite{Yao:2006px} as there are two states.   & Herwig::TensorMesonVectorPScalar::TensorVP \\ 
\hline
0.348989 & $*****$ & on & $ \rho^-, \pi^0 $  & The decay of $a_2^-(1320)$ to a rho and a pion, the branching ratio is from \cite{Yao:2006px} with a minor change to ensure the branching ratios sum to unity. This is half the rate from \cite{Yao:2006px} as there are two states.   & Herwig::TensorMesonVectorPScalar::TensorVP \\ 
\hline
0.143657 & $*****$ & on & $ \pi^-, \eta $  & The decay of $a_2^-(1320)$ to an $\eta$ and a pion with branching ratio from \cite{Yao:2006px} (there are minor adjustments to ensure the branching ratios sum to unity.)   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.102417 & $****$ & on & $ \omega, \rho^- $  & The decay of $a_2^-(1320)$ to two pions, modelled as the $\rho$, and an omega with branching ratio from \cite{Yao:2006px} (there are minor adjustments to ensure the branching ratios sum to unity.)   & Herwig::TensorMesonVectorVector::TVV \\ 
\hline
0.048104 & $*****$ & on & $ K^-, K^0 $  & The decay of the $a_2^-(1320)$ to two kaons, the rate is from \cite{Yao:2006px} with minor modifications to ensure the branching ratios sum to unity.   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.005199 & $****$ & on & $ \eta', \pi^- $  & The decay of $a_2^-(1320)$ to a pion and an $\eta'$ with branching ratio from \cite{Yao:2006px}. There are minor adjustments to ensure the branching ratios sum to unity.   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.002645 & $****$ & on & $ \pi^-, \gamma $  & The decay of $a_2^-(1320)$ to a photon and a pion with brnaching ratio from \cite{Yao:2006px} and minor modifications to ensure the branching ratios sum to unity.   & Herwig::TensorMesonVectorPScalar::TensorVP \\ 
\hline
\end{longtable}The $a_2^-(1320)$ decay modes are given in Table~\ref{tab:-215decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|a_2+mass| for the $a_2^-(1320)$.
The width generator is \verb|a_2+width| for the $a_2^-(1320)$.

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 The particle was checked by Peter Richardson at 16:1:41 on the 22nd of August 2007. The most recently changed decay mode was modified at 15:9:18 on the 13th of October 2006. The particle data was last modified at 13:31:57 on the 21st of August 2007.

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