ππ scattering and the meson resonance spectrum
نویسندگان
چکیده
منابع مشابه
uc l - th / 9 70 80 38 v 1 2 0 A ug 1 99 7 ππ Scattering and the Meson Resonance Spectrum
A ππ, K̄K, and ρρ(ωω) fully coupled channel model is used to predict the lowest isospin S, P, D, F-wave phase shifts and inelasticities for elastic ππ scattering from threshold to 2.0 GeV. As input the S-matrix is required to exhibit poles corresponding to the meson resonance table of the Particle Data Group. As expected, the ππ inelasticity is very strongly related to the opening of the K̄K chan...
متن کاملΠπ Scattering
We demonstrate that, together with the available experimental information , chiral symmetry determines the low energy behaviour of the ππ scattering amplitude to within very small uncertainties. In particular, the threshold parameters of the S–, P –, D– and F –waves are predicted, as well as the mass and width of the ρ and of the broad bump in the S–wave. The implications for the coupling const...
متن کاملTheory of Ππ Scattering
The study of ππ scattering is a classical subject in the field of strong interactions: it is a scattering process that may occur at very low energy, far away from the resonance region, and it only involves the quasi–Goldstone bosons of the chiral symmetry of strong interactions. If we stay at low energy, we could expect its dynamics to be strongly constrained by chiral symmetry: as Weinberg sho...
متن کاملOn the dispersion theory of ππ scattering
Recent developments in low energy pion physics are reviewed, emphasizing the strength of dispersion theory in this context. As an illustration of the method, I discuss some consequences of the forward dispersion relation obeyed by the isoscalar component of the scattering amplitude. Contribution to the proceedings of the workshop Quark Confinement and the Hadron Spectrum VII, Ponta Delgada, Azo...
متن کاملScattering Lengths and Medium and High Energy ππ Scattering
Medium and high energy absorptive parts contribute to dispersive expressions for Dwave scattering lengths, a2 and a 2 2. For the model employed by Basdevant, Frogatt and Peterson we find the Dwave driving term contributions to the Dwave scattering lengths are 1.8 · 10−4 to a2 and 0.4 · 10 −4 to a2, roughly 10% and 30% of their respective central experimental values. Inequivalent sets of sum rul...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 1998
ISSN: 1434-6001,1434-601X
DOI: 10.1007/s100500050067