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\title{\boldmath{ $f_1(1285)$}\ \ \ \ \ \ \ $****$}
\maketitle
The lighter of the isospin singlets containing only light quarks from the second pseudovector multiplet. The mass and width are taken from \cite{Yao:2006px}. The $f_1(1285)$ is allowed to be off-shell by ten times the width.
The $f_1(1285)$ has mass $1281.8$~MeV and is unstable. The $f_1(1285)$ has spin $1$, charge $0$ and is colour neutral.
 The $f_1(1285)$ is a meson and is from the $1^3P_1$ multiplet.The $f_1(1285)$ has width $24.2$~MeV. The lower limit on the mass of the particle is $242$~MeV and the upper limit is $242$~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 20223.
\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 $f_1(1285)$ (continues).}
\endfoot
\caption{The decay modes of the $f_1(1285)$.}
\endlastfoot
\label{tab:20223decaymodes}
0.142570 & $****$ & on & $ a^0_0(980), \pi^0 $  & The decay of the $f_1(1285)$ to $a_0$ and a pion. The branching ratio is from the \cite{Yao:2006px} for the $a_0$ in the $\eta\pi$ mode only and our branching ratio for the $a_0\to\eta\pi$ (there are some minor changes to ensure the branching ratios sum to one.) This mode is one third of the total for the mode due to isospin.   & Herwig::VectorMeson2Meson::Vector2Meson \\ 
\hline
0.142570 & $****$ & on & $ a^+_0(980), \pi^- $  & The decay of the $f_1(1285)$ to $a_0$ and a pion. The branching ratio is from the \cite{Yao:2006px} for the $a_0$ in the $\eta\pi$ mode only and our branching ratio for the $a_0\to\eta\pi$ (there are some minor changes to ensure the branching ratios sum to one.) This mode is one third of the total for the mode due to isospin.   & Herwig::VectorMeson2Meson::Vector2Meson \\ 
\hline
0.142570 & $****$ & on & $ a^-_0(980), \pi^+ $  & The decay of the $f_1(1285)$ to $a_0$ and a pion. The branching ratio is from the \cite{Yao:2006px} for the $a_0$ in the $\eta\pi$ mode only and our branching ratio for the $a_0\to\eta\pi$ (there are some minor changes to ensure the branching ratios sum to one.) This mode is one third of the total for the mode due to isospin.   & Herwig::VectorMeson2Meson::Vector2Meson \\ 
\hline
0.110471 & $***$ & on & $ \rho^+, \pi^-, \pi^0 $  & The decay of the $f_1(1285)$ to $\rho\pi\pi$. This is half the two neutral and two charged pions branching ratio taken from \cite{Yao:2006px} (there are minor modifications to ensure the branching ratios sum to unity.)   & Herwig::Hw64::DecayME0 \\ 
\hline
0.110471 & $***$ & on & $ \rho^0, \pi^+, \pi^- $  & The decay of the $f_1(1285)$ to $\rho^0\pi^+\pi^-$ which saturates the four charged pion branching ratio taken from \cite{Yao:2006px} (there are minor modifications to ensure the branching ratios sum to unity.)   & Herwig::Hw64::DecayME0 \\ 
\hline
0.110471 & $***$ & on & $ \rho^-, \pi^+, \pi^0 $  & The decay of the $f_1(1285)$ to $\rho\pi\pi$. This is half the two neutral and two charged pions branching ratio taken from \cite{Yao:2006px} (there are minor modifications to ensure the branching ratios sum to unity.)   & Herwig::Hw64::DecayME0 \\ 
\hline
0.107123 & $***$ & on & $ \eta, \pi^+, \pi^- $  & The decay of the $f_1(1285)$ to $\eta\pi\pi$ with branching ratio from \cite{Yao:2006px}. The mode has the $a_0$ removed and the relative charge and neutral pion fractions are determined by the identical particle symmetry factor for the neutral mode.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.055235 & $***$ & on & $ \rho^0, \gamma $  & The decay of the $f_1(1285)$ to a rho meson and a photon with branching ratio taken from \cite{Yao:2006px} (there are minor modifications to ensure the branching ratios sum to unity.)    & Herwig::Hw64::DecayME0 \\ 
\hline
0.053562 & $***$ & on & $ \eta, \pi^0, \pi^0 $  & The decay of the $f_1(1285)$ to $\eta\pi\pi$ with branching ratio from \cite{Yao:2006px}. The mode has the $a_0$ removed and the relative charge and neutral pion fractions are determined by the identical particle symmetry factor for the neutral mode.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.008071 & $***$ & on & $ K^+, \bar{K}^0, \pi^- $  & The decay of the $f_1(1285)$ to two kaons and a pion. The branching ratio is based on that in \cite{Yao:2006px} after we have subtracted the piece we assign to $a_0\pi$ based on our $a_0$ branching ratios (there is a minor adjustment to ensure the branching ratios sum to one.) The relative contributions of the different kaon and pion states is then determined by isospin.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.008071 & $***$ & on & $ K^-, K^0, \pi^+ $  & The decay of the $f_1(1285)$ to two kaons and a pion. The branching ratio is based on that in \cite{Yao:2006px} after we have subtracted the piece we assign to $a_0\pi$ based on our $a_0$ branching ratios (there is a minor adjustment to ensure the branching ratios sum to one.) The relative contributions of the different kaon and pion states is then determined by isospin.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.004036 & $***$ & on & $ K^+, K^-, \pi^0 $  & The decay of the $f_1(1285)$ to two kaons and a pion. The branching ratio is based on that in \cite{Yao:2006px} after we have subtracted the piece we assign to $a_0\pi$ based on our $a_0$ branching ratios (there is a minor adjustment to ensure the branching ratios sum to one.) The relative contributions of the different kaon and pion states is then determined by isospin.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.004036 & $***$ & on & $ K^0, \bar{K}^0, \pi^0 $  & The decay of the $f_1(1285)$ to two kaons and a pion. The branching ratio is based on that in \cite{Yao:2006px} after we have subtracted the piece we assign to $a_0\pi$ based on our $a_0$ branching ratios (there is a minor adjustment to ensure the branching ratios sum to one.) The relative contributions of the different kaon and pion states is then determined by isospin.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.000743 & $***$ & on & $ \phi, \gamma $  & The decay of the $f_1(1285)$ to a phi meson and a photon with branching ratio taken from \cite{Yao:2006px} (there are minor modifications to ensure the branching ratios sum to unity.)    & Herwig::Hw64::DecayME0 \\ 
\hline
\end{longtable}The $f_1(1285)$ decay modes are given in Table~\ref{tab:20223decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|f_1mass| for the $f_1(1285)$.
The width generator is \verb|f_1width| for the $f_1(1285)$.

\bibliography{particles}


 The particle was checked by Peter Richardson at 21:29:6 on the 20th of October 2007. The most recently changed decay mode was modified at 14:37:0 on the 2nd of August 2007. The particle data was last modified at 14:26:40 on the 2nd of August 2007.

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