up+down scalar meson

by ddimensoes
Tags: meson, parity, pseudoscalar, scalar
ddimensoes is offline
Nov19-12, 01:12 PM
P: 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?
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mathman is offline
Nov19-12, 02:54 PM
Sci Advisor
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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.
Vanadium 50
Vanadium 50 is offline
Nov19-12, 08:07 PM
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P: 15,610
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.

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