| 31. | The first non-vanishing case occurs when two gluons have negative helicity.
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| 32. | Gluons themselves possess color charge and can mutually interact.
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| 33. | But physicists have yet to prove conclusively that quarks and gluons can never escape.
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| 34. | But they do not understand completely how those quarks and the gluons are arranged.
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| 35. | Protons and neutrons are baryons, joined by gluons to form the atomic nucleus.
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| 36. | All quarks and gluons in QCD interact with each other through the strong force.
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| 37. | However, quark gluon plasmas have been observed.
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| 38. | The particle that carries the strong nuclear force is thought to be a gluon.
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| 39. | In these, gluons that bind quarks together confer most of the particle mass.
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| 40. | It describes particles similar to the gluons of quantum chromodynamics together with certain fermions.
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