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If you look at the standard model you will only find gluons. This is very clear and should settle any doubts. (Pions are a historical relic of the middle of the twentieth century which only provide an approximation.)


Since you asked this question there have been a couple of confirmation of exotic particles which consist of four or more quarks. For example, Z(4430) recently observed in LHCb, was already discovered by Belle long time ago. This exotic particle has a $c\bar{c}d\bar{u}$ quark structure. This would lead us to think how color confinement would be satisfied? As ...


The strong interaction explains the characteristics and operation of the strong force, one of the four fundamental forces of nature (strong force, weak force, electromagnetism, gravity). The strong force binds together quarks that compose protons, neutrons, and mesons. Gluons are carriers of the strong force. The nuclear force is a residual manifestation ...


The force responsible for the stability of the atoms and the nucleons is the Strong force. Just like electric charge is a value of how much a particle interact with the electromagnetic field, the color of a particle is a value of how much a particle interact with the Strong field.


Ok after some days of thinking i belive i've solved both problems, so i tought i just answer my self for future reference. (verba volant scripta manent) For the practical problem: When i wrote the parametrization for the four momentums of the particles involved in the scattering i did wrongly assume that the gluon's momentum $K_A$ should have been corrected ...

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