The Strong CP Problem and the Visibility of Invisible Axions
作者： Wilfried Buchmüller
DOI: 10.1007/978-1-4684-5389-8_23
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摘要: One of the remarkable successes quantum chromodynamics (QCD), theory hadrons, is solution U(1) problem [1]. In a quark model with three flavours one expects as consequence spontaneous chiral symmetry breaking nine pseudo-Goldstone bosons. Eight them, which are related to nonabelian axial SU(3)A symmetry, can be identified pions, kaons and η. The candidate for ninth boson, however, isoscalar meson η’, too heavy boson broken U(1)A symmetry.
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