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\title{\boldmath{ $f_0(980)$}\ \ \ \ \ \ \ $***$}
\maketitle
The mass, width and decay modes of the $f_0(980)$ are problematic. We use the value from \cite{Ablikim:2004wn}  for the mass which is related to our modelling of the decays. We use the Flatte parameterisation of \cite{Ablikim:2004wn}  for the lineshape and therefore the width parameter is not used, the value quoted is the value computed for the on-shell mass from the parameterisation. The width from the Flatte parameterisation is also used to determine the branching ratios which vary with the off-shell mass. The values in the table are therefore indicative only and correspond to the values achieved in $D^+\to f_0\pi^+$, they are not used in the simulation.

The $f_0(980)$ has mass $965$~MeV and is unstable. The $f_0(980)$ has spin $0$, charge $0$ and is colour neutral.
 The $f_0(980)$ is a mesonThe $f_0(980)$ has width $163.5$~MeV. The lower limit on the mass of the particle is $256$~MeV and the upper limit is $512$~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 9010221.
\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 $f_0(980)$ (continues).}
\endfoot
\caption{The decay modes of the $f_0(980)$.}
\endlastfoot
\label{tab:9010221decaymodes}
0.493994 & $***$ & on & $ \pi^+, \pi^- $  & The decay of the $f_0(980)$ to two charged pions is two thirds of the total $\pi\pi$ rate due to the identical particle symmetry factor for the $\pi^0\pi^0$ mode.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
0.247000 & $***$ & on & $ \pi^0, \pi^0 $  & The decay of the $f_0(980)$ to two neutral pions is one third of the total $\pi\pi$ rate due to the identical particle symmetry factor.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
0.139000 & $***$ & on & $ K^+, K^- $  & The decay of the $f_0(980)$ to two charged kaons is half of the $K\bar{K}$ rate.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
0.120000 & $***$ & on & $ K^0, \bar{K}^0 $  & The decay of the $f_0(980)$ to two neutral kaons is half of the $K\bar{K}$ rate.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
0.000006 & $***$ & on & $ \gamma, \gamma $  & The decay of the $f_0(980)$ to two photons is the partial width from \cite{Yao:2006px} divided by our choice for the total width.   & Herwig::Hw64::DecayME0 \\ 
\hline
\end{longtable}The $f_0(980)$ decay modes are given in Table~\ref{tab:9010221decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|f_0mass| for the $f_0(980)$.
The width generator is \verb|f_0width| for the $f_0(980)$.

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 The particle was checked by Peter Richardson at 21:41:27 on the 20th of October 2007. The most recently changed decay mode was modified at 13:30:34 on the 15th of August 2007. The particle data was last modified at 13:29:11 on the 15th of August 2007.

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