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Neutral meson problem

  1. Oct 16, 2008 #1
    I have been learning about quarks which is really interesting, but i have become confused when it comes to mesons. I have learned the basics of annhilation, particle and anti-particle, etc, but I have learned that neutral mesons, such as the pi neutral meson are made of a quark, (e.g. up), and its corresponding anti-particle, (e.g. anti-up), so why do the particles join together to form the meson, shouldn't the particles annhilate?

    Pi+ meson= up quark, anti-down quark
    Pi neutral meson= up quark, anti-up quark/ down quark, anti-down quark
    Pi- meson= down quark, anti-up quark
  2. jcsd
  3. Oct 16, 2008 #2


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    ...apparently this is why we don't see a lot of Pi mesons around on a day to day basis... the lifetime of the Pi is pretty short (or long depending on what you compare it to)...

    The situation is *similar* (I stress similar because the analogy is quite imperfect, yet perhaps helpful) with "positronium" in which a positron and an electron can briefly form a bound state. But, they eventually annihilate.
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