The puzzle of the quark model: Weak radiative hyperon decays

Details The puzzle of the quark model: Weak radiative hyperon decays The puzzle of the quark model: Weak radiative hyperon decays

1995-12-11

arxiv.org/abs/hep-ph/9512274v2

Nucl.Phys.Proc.Suppl. 50 (1996) 211-215

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, reformatted to dispense with the use of the espcrc2.sty file, to appear in the Proceedings of the conference

Scientific paper

10.1016/0920-5632(96)00393-3

Weak radiative hyperon decays present us with a long-standing puzzle, namely the question of validity of a hadron-level theorem proved by Hara. We briefly discuss the conflict between expectations based on Hara's theorem and experiment as well as the way in which the quark model evades the theorem. Violation of Hara's theorem in the quark model is traced back to the issue of hadron compositeness and the nonequivalence of standard ways of imposing gauge-invariance condition at quark and hadron levels. This suggests that our understanding of nonlocal composite nature of hadrons may require some important change.

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