By "physical particle" I mean color-singlet particles which have asymptotic [itex]T=\pm \infty[/itex] states. How many stable particles exist in the theory? Only one? SU(2), SU(3), and SU(N) gauge groups can all be discussed.(adsbygoogle = window.adsbygoogle || []).push({});

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# Is the glueball the only stable physical particle in pure Yang-Mills theory?

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