Low energy pion-hyperon interaction
نویسندگان
چکیده
منابع مشابه
Pion–pion scattering at low energy
We present technical details of the evaluation of the elastic ππ scattering amplitude to two loops in chiral perturbation theory. In particular, we elaborate on the renormalization procedure at the two–loop order and on the evaluation of the relevant Feynman diagrams that can all be expressed in terms of elementary functions. For the sake of clarity, we discuss these matters both in the N–compo...
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A dispersion framework, appropriate for discussing the low-energy pion-nucleon interaction , is reviewed. Sensitivity of the isoscalar D-amplitude at the unphysical Cheng-Dashen point to input from different phase shift analyses and low-energy experiments is discussed.
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An analysis of low-energy charged pion-nucleon data from recent pp experiments is presented. From the scattering lengths and the Goldberger-Miyazawa-Oehme ~GMO! sum rule we find a value of the pion-nucleon coupling constant of f 50.075660.0007. We also find, contrary to most previous analyses, that the scattering volumes for the P31 and P13 partial waves are equal, within errors, corresponding ...
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A. calculation is made of the forces between hyperons and nucleons under the assumption that the forces are due to the exchange of pions. The h. and Z are assumed to have spin —,and the same parity. The Hamiltonian is taken -to be the same as the static-model pion-nucleon Hamiltonian except for differences in isotopic spin and possibly in the strength of the coupling. The same approximations ar...
متن کاملTheoretical Aspects of the Pion-pion Interaction
The structure of the ππ interaction at low energies is strongly constrained by the fact that the pion is the Goldstone boson of a spontaneously broken approximate symmetry of QCD.1 The scattering amplitude can be calculated in a systematic way in the framework of Chiral Perturbation Theory (ChPT),2 by an expansion which converges very rapidly near the center of the Mandelstam triangle. However,...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2001
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.63.065203