sci.physics.particle

On Feb 28, 5:19 am, omega wrote:
> Every meson is composed of a quark and an antiquark. And a pion is
> composed of an up quark and an up antiquark. But antimatter will
> annihilate matter. How could these two particles stay closely yet
> peacefully?

How does a spring work? Sometimes even fires will burn backwards--
this is called dissociation.

> P.S It's my first time to use this web. Can any one tell me how to
> type expressions here like up antiquark? Thank you very much!

There is none in HTML. I use 'u'.

-Aut