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\title{\boldmath{ $u$}\ \ \ \ \ \ \ $*****$}
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 The up quark is the isospin=$1/2$ first 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 $u$ has mass $2.3$~MeV and is stable. The $u$ has spin $1/2$, charge $2/3$ and is in a colour triplet.
 The $u$ is a quark.
The particle is a constituent of the hadrons and the constituent mass is 325 MeV. The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The PDG code is 2.
There are no decay modes for the $u$.



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

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 The particle was checked by Peter Richardson at 21:46:31 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 16:27:7 on the 17th of September 2007.

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