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Axial amplitudes for Delta excitation in chiral quark models | | B. Golli
; S. Sirca
; L. Amoreira
; M. Fiolhais
; | | Date: |
1 Oct 2002 | | Journal: | Phys.Lett. B553 (2003) 51-60 | | Subject: | hep-ph | | Abstract: | We study the axial amplitudes for the N-Delta transition in models with quarks and chiral mesons. A set of constraints on the pion field is imposed which enforces PCAC and the off-diagonal Goldberger-Treiman relation. The quark contribution to the amplitudes in general strongly underestimates the C^A_5 amplitude as well as the piNDelta strong coupling constant. We show that the results are considerably improved in models that, in addition to the pion cloud, incorporate a fluctuating sigma field inside the baryon. | | Source: | arXiv, hep-ph/0210014 | | Services: | Forum | Review | PDF | Favorites | |
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