Pion-baryon couplings

Baryon-Pion Couplings from Large-Nc QCD

We derive a set of consistency conditions for the pion-baryon coupling constants in the large-Nc limit of QCD. The consistency conditions have a unique solution which are precisely the values for the pion-baryon coupling constants in the Skyrme model. We also prove that non-relativistic SU(2Nf ) spin-flavor symmetry (where Nf is the number of light flavors) is a symmetry of the baryon-pion coup...

Phi meson production cross sections in pion-baryon and baryon-baryon interactions

Phi meson production in pion-baryon and baryon-baryon interactions near the production threshold is studied in a boson-exchange model. Parameters in this model are either taken from the Bonn model for the nucleon-nucleon potential or determined from the measured phi meson decay width and the experimental data for the reactions πp→φn and pp→ppφ. The isospinaveraged cross sections for the reactio...

Determination of pion-baryon coupling constants from QCD sum rules.

We evaluate the πNN , πΣΣ and πΣΛ coupling constants using QCD sum rules based on pion-to-vacuum matrix elements of correlators of two interpolating baryon fields. The parts of the correlators with Dirac structure k/γ5 are used, keeping all terms up to dimension 5 in the OPE and including continuum contributions on the phenomenological side. The ratios of these sum rules to baryon mass sum rule...

Neutral pion photoproduction on nuclei in baryon chiral perturbation theory.

Pion–baryon coupling constants in light cone QCD sum rules

We calculate the πΣΛ and πΣΣ coupling constants in light cone QCD sum rules for the structure σαβγ5p α q β. A comparison of our results on these coupling constants with prediction of the SU(3) symmetry is presented. e-mail: [email protected] e-mail: [email protected]