Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Up+down scalar meson

  1. Nov 19, 2012 #1
    Why is there no meson made up by only up and down quarks but even under parity? Is there something that forbids its existence?
    The pions are all axial (pseudoscalar) mesons. As we go higher in energy, there are such "flavour-pure" mesons. Is this a consequence of the almost-unbroken isospin SU(3)? If this is so, why can't I find such "flavour-pure" mesons at low energies?
     
  2. jcsd
  3. Nov 19, 2012 #2

    mathman

    User Avatar
    Science Advisor
    Gold Member

    All mesons are made up of quark plus antiquark. You can't have a two quark particle since the color charge must add up to white.

    I can't comment on the rest of your question - beyond my expertise.
     
  4. Nov 19, 2012 #3

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Particles mix, and the closer they are in mass, the more they mix. So you don't have a pure uubar or ddbar state because they mix, and the eta adds some ssbar, etc. The same thing happens with the scalars.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Up+down scalar meson
  1. Up and down quarks (Replies: 8)

Loading...