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Up+down scalar meson 
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#1
Nov1912, 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 "flavourpure" mesons. Is this a consequence of the almostunbroken isospin SU(3)? If this is so, why can't I find such "flavourpure" mesons at low energies? 


#2
Nov1912, 02:54 PM

Sci Advisor
P: 6,112

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. 


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