Pion-pair formation and the pion dispersion relation in a hot pion gas
نویسندگان
چکیده
منابع مشابه
Pion - Pion Scattering in Chiral Perturbation and Dispersion Relation
Chiral perturbation theory, the low energy effective theory of the strong interactions for the light pseudoscalar degrees of freedom, is based on effective Lagrangian techniques and is an expansion in the powers of the external momenta and the powers of the quark masses, which correct the soft-pion theorems. Our primary emphasis will be on the problem of ππ scattering. After briefly reviewing t...
متن کاملVector mesons in a hot pion gas
Previous selfconsistent approximation studies [1, 2] for the description of hadrons in hot and dense matter were extended along several lines [3, 4]. These concern the inclusion of the real parts of all polarisation functions by appropriately subtracted dispersion relations and of RPA-type π-ρ – meson correlations, which also lead to corresponding vertex corrections. Thus we arrive at a system ...
متن کاملPion–Pion and Pion–Nucleon Interactions in Chiral Perturbation Theory*
Elastic pion–pion and pion–nucleon scattering are reviewed in the context of chiral perturbation theory. Theoretical results from systematic low–energy expansions to O(p) for ππ and to O(p) for πN are compared with experimental data. Possible future developments are outlined. Talk given at the Workshop on Chiral Dynamics 1997 Mainz, Germany, Sept. 1 5, 1997 To appear in the Proceedings * Work s...
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We show how the reaction e-e’+ n-n’y can be used to study the dipion system in states of even charge conjugation (and even angular momentum). In particular, its utility for experimentally investigating an I = 0, J = 0 resonance (e-meson) is discussed in detail. (Submitted to Phys. Rev. ) * Work supported by the U. S. Atomic Energy Commission. t N. S. F. Graduate Fellow. To lowest order in the f...
متن کاملThe pion-pion scattering amplitude
We obtain reliable ππ scattering amplitudes consistent with experimental data, both at low and high energies, and fulfilling appropriate analyticity properties. We do this by first fitting experimental low energy (s ≤ 1.42GeV) phase shifts and inelasticities with expressions that incorporate analyticity and unitarity. In particular, for the S wave with isospin 0, we discuss in detail several se...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1997
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(96)00409-5