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Restrictions on symmetry breaking in vector-like gauge theories

1984; Elsevier BV; Volume: 234; Issue: 1 Linguagem: Inglês

10.1016/0550-3213(84)90230-x

1873-1562

Cumrun Vafa, Edward Witten,

Particle physics theoretical and experimental studies

Modulo some highly plausible assumptions, we show that vector-like global symmetries (like isospin or baryon number) are not spontaneously broken in vector-like gauge theories with θ = 0 (like QCD). We also show that in these theories massless bound states do not form from massive constituents.