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\title{\boldmath{ $b$}\ \ \ \ \ \ \ $*****$}
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The bottom quark is the isospin=$-1/2$ third generation quark. The physical mass is at the centre of the range quoted in \cite{Yao:2006px} and is only used as a coupling while the constituent mass is used kinematically.
The $b$ has mass $4200$~MeV and is stable. The $b$ has spin $1/2$, charge $-1/3$ and is in a colour triplet.
 The $b$ is a quark.
The particle is a constituent of the hadrons and the constituent mass is 5000 MeV. The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The PDG code is 5.
There are no decay modes for the $b$.



 There is no mass generator for the $b$.
 There is no width generator for the $b$.

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 The particle was checked by Peter Richardson at 21:46:54 on the 20th of October 2007. The most recently changed decay mode was modified at 0:0:0 on the 0th of 0. The particle data was last modified at 16:29:11 on the 17th of September 2007.

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