% particle data information automatically produced from the herwig database
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\title{\boldmath{ $K_1^-(1270)$}\ \ \ \ \ \ \ $****$}
\maketitle
The $K_1^-(1270)$ is a mixture of the $K$-mesons from the two lightest pseudovector multiplets. We have assigned it to the $1^1P_1$ multiplet along with the lighter states for the pseudovector mesons which mix and contain heavy quarks. The mass, width and branching ratios are taken from \cite{Yao:2006px}. The $Kf_0(1370)$ mode would be very off-shell and so is not included and the $K\omega$ mode is scaled down by $2\sigma$ as it is also off-shell. The limit on the off-shellness of the particle is set to twice the width.
The $K_1^-(1270)$ has mass $1272$~MeV and is unstable. The $K_1^-(1270)$ has spin $1$, charge $-1$ and is colour neutral.
 The $K_1^-(1270)$ is a meson and is from the $1^1P_1$ multiplet.The $K_1^-(1270)$ has width $90$~MeV. The lower limit on the mass of the particle is $180$~MeV and the upper limit is $180$~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 -10323.
\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 $K_1^-(1270)$ (continues).}
\endfoot
\caption{The decay modes of the $K_1^-(1270)$.}
\endlastfoot
\label{tab:-10323decaymodes}
0.298667 & $****$ & on & $ \rho^-, \bar{K}^0 $  & The decay of the $K_1^-(1270)$ to a rho and a kaon. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.199111 & $****$ & on & $ \bar{K}^{*0}_0(1430), \pi^- $  & The decay of the $K_1^-(1270)$ to $K_0^*(1430)$ and a pion. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::VectorMeson2Meson::Vector2Meson \\ 
\hline
0.149333 & $****$ & on & $ \rho^0, K^- $  & The decay of the $K_1^-(1270)$ to a rho and a kaon. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.122222 & $***$ & on & $ \bar{K}^{*0}, \pi^- $  & The decay of $K_1^-(1270)$ to a $K^*$ and a pion. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.099556 & $****$ & on & $ K^{*-}_0(1430), \pi^0 $  & The decay of the $K_1^-(1270)$ to $K_0^*(1430)$ and a pion. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::VectorMeson2Meson::Vector2Meson \\ 
\hline
0.070000 & $****$ & on & $ K^-, \omega $  & The decay of the $K_1^-(1270)$ to an $\omega$ and a kaon. The branching ratio is taken from \cite{Yao:2006px} reduced by $2\sigma$ due to the off-shellness of the decay.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
0.061111 & $***$ & on & $ K^{*-}, \pi^0 $  & The decay of $K_1^-(1270)$ to a $K^*$ and a pion. The branching ratio is taken from \cite{Yao:2006px} scaled up due to the reduced $K\omega$ rate and the absence of the $Kf_0(1370)$ mode.   & Herwig::PVectorMesonVectorPScalar::PVectorVP \\ 
\hline
\end{longtable}The $K_1^-(1270)$ decay modes are given in Table~\ref{tab:-10323decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|K_1+mass| for the $K_1^-(1270)$.
The width generator is \verb|K_1+width| for the $K_1^-(1270)$.

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 The particle was checked by Peter Richardson at 21:23:5 on the 20th of October 2007. The most recently changed decay mode was modified at 9:1:16 on the 6th of September 2007. The particle data was last modified at 9:0:1 on the 6th of September 2007.

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