Hara's theorem, quark model, and \gamma _5-dependent renormalization constants

We discuss the applicability of -dependent field renormalization as a means of renormalizing away the apparent violation of Hara's theorem observed in the quark model. It is pointed out that a result totally analogous to the violation of Hara's theorem is predicted by the quark model also for neutral baryons. For neutral baryons, however, such a result cannot be renormalized away. This proves that -dependent renormalization does not provide a proper way for a hadron-level understanding of the violation of Hara's theorem observed in the quark model. Received: 12 November 1997 / Revised version: 17 February 1998 Published online: 9 April 1998