ar X iv : h ep - p h / 97 07 30 7 v 1 1 0 Ju l 1 99 7 Suppression of πNN ∗ Coupling and Chiral Symmetry
نویسندگان
چکیده
Meson-baryon couplings between positive and negative parity baryons are investigated using two point correlation functions in the soft meson limit. We find that the πN N * coupling vanishes due to chiral symmetry, while the ηN N * coupling remains finite. We perform an analysis based on the algebraic method for SU (2) and SU (3) chiral symmetry, and find that baryon axial charges play an essential role for vanishing coupling constants.
منابع مشابه
ar X iv : h ep - t h / 97 03 10 3 v 1 1 4 M ar 1 99 7 U ( 2 ) - chiral symmetries of supersymmetric QED 3
Supersymmetry is studied in 2+1 dimensions. In addition to the mul-tiplets corresponding to those in 3+1 dimensions the Clifford algebra allows an extra set. When the extra chiral multiplet is included, formulating supersymmetric QED3 in the manner of Wess and Zumino yields a lagrangian with a richer 'chiral' symmetry than that derived from super-symmetric QED by dimensional reduction.
متن کاملar X iv : h ep - p h / 96 10 52 0 v 2 1 7 Fe b 19 97 Suppression of πNN ( 1535 ) Coupling in the QCD Sum Rule
The πN N * and ηN N * coupling constants are studied based on the two point functions between the vacuum and a one meson state in the soft meson limit. In terms of a suitably constructed interpolating field for the nucleon and resonances, we have found that the πN N * couplings vanish, while ηN N * couplings remain finite. This result explains a relatively suppressed coupling of πN N (1535) as ...
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