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\title{\boldmath{ $\eta_2(1645)$}\ \ \ \ \ \ \ $***$}
\maketitle
The $\eta_2(1645)$ is the lighter of the isospin singlet members of the lightest pseudotensor multiplet. It properties are not well measured and the \cite{Yao:2006px} does not include its branching ratios. The branching ratios were calculated using the values from \cite{Yao:2006px} for the ratios
\begin{eqnarray}
\frac{\Gamma(K\bar{K}\pi)}{\Gamma(a_2\pi)} &=& 0.07\pm0.03,\\
\frac{\Gamma(a_2\pi)}{\Gamma(a_0\pi)} &=& 13.0\pm2.7,
\end{eqnarray}
together with the assumption that the $K\bar{K}\pi$ mode is entirely due to $K^*K$ apart from a small contribution from $a_0(980)\pi$. We also assume that the $\eta\pi\pi$ contribution is solely due to the $a_0(980)\pi$ state. The $\eta_2(1645)$ is allowed to be off-shell by twice the width.
The $\eta_2(1645)$ has mass $1617$~MeV and is unstable. The $\eta_2(1645)$ has spin $2$, charge $0$ and is colour neutral.
 The $\eta_2(1645)$ is a meson and is from the $1^1D_2$ multiplet.The $\eta_2(1645)$ has width $181$~MeV. The lower limit on the mass of the particle is $362$~MeV and the upper limit is $362$~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 10225.
\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 $\eta_2(1645)$ (continues).}
\endfoot
\caption{The decay modes of the $\eta_2(1645)$.}
\endlastfoot
\label{tab:10225decaymodes}
0.290634 & $***$ & on & $ a_2^0(1320), \pi^0 $  & The decay of $\eta_2(1645)$ to the $a_2$ and a pion. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.290633 & $***$ & on & $ a_2^+(1320), \pi^- $  & The decay of $\eta_2(1645)$ to the $a_2$ and a pion. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.290633 & $***$ & on & $ a_2^-(1320), \pi^+ $  & The decay of $\eta_2(1645)$ to the $a_2$ and a pion. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.022356 & $***$ & on & $ a^+_0(980), \pi^- $  & The decay of $\eta_2(1645)$ to the $a_0$ and a pion. The branching ratio is calculated as described above.   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.022356 & $***$ & on & $ a^-_0(980), \pi^+ $  & The decay of $\eta_2(1645)$ to the $a_0$ and a pion. The branching ratio is calculated as described above.   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.022356 & $***$ & on & $ a^0_0(980), \pi^0 $  & The decay of $\eta_2(1645)$ to the $a_0$ and a pion. The branching ratio is calculated as described above.   & Herwig::TensorMeson2PScalar::Tensor2PScalar \\ 
\hline
0.015258 & $***$ & on & $ K^{*+}, K^- $  & The decay of $\eta_2(1645)$ to the $K^*$ and a kaon. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.015258 & $***$ & on & $ K^{*-}, K^+ $  & The decay of $\eta_2(1645)$ to the $K^*$ and a kaon. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.015258 & $***$ & on & $ K^{*0}, \bar{K}^0 $  & The decay of $\eta_2(1645)$ to the $K^*$ and a kaon. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
0.015258 & $***$ & on & $ \bar{K}^{*0}, K^0 $  & The decay of $\eta_2(1645)$ to the $K^*$ and a kaon. The branching ratio is calculated as described above.   & Herwig::Hw64::DecayME0 \\ 
\hline
\end{longtable}The $\eta_2(1645)$ decay modes are given in Table~\ref{tab:10225decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|eta_2Mass| for the $\eta_2(1645)$.
The width generator is \verb|eta_2Width| for the $\eta_2(1645)$.

\bibliography{particles}


 The particle was checked by Peter Richardson at 21:32:58 on the 20th of October 2007. The most recently changed decay mode was modified at 15:58:50 on the 2nd of August 2007. The particle data was last modified at 16:51:48 on the 7th of September 2007.

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