منابع مشابه
Pion-pion Scattering above Resonances
We model large angle intermediate energy pion-pion scattering by the pQCD two-gluon (2g) exchange contribution and discuss the onset of the dominance of the Glauber-Gribov-Landshoff (GGL) component. The pQCD 2g exchange contribution becomes substantial already at |t| ∼ 1 GeV, but the pQCD exchange dominance is deferred to |t| ∼ 3 GeV because of competing multiple soft rescattering effects. Base...
متن کاملPion Scattering Length from Two - Pion Wave Function ∗
We present a preliminary report on a calculation of scattering length for I = 2 S-wave two-pion system directly from the two-pion wave function. Results are compared with those calculated from the time dependence of twopion four-point functions. Calculations are made with an RG-improved action for gluons and improved Wilson action for quarks at a−1 = 1.207(12) GeV on 20 × 48 and 24 × 48 lattices.
متن کامل0 Two pion electroproduction ∗
We have extended a model for the γN → ππN reaction to virtual photons and selected the diagrams which have a ∆ in the final state. The agreement found with the γ v p → ∆ 0 π + and γ v p → ∆ ++ π − reactions is good. The sensitivity of the results to N ∆ transition form factors is also studied. The present reaction, selecting a particular final state, is an extra test for models of the γ v N → π...
متن کاملPion - Pion Scattering Information
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 کاملPion Rescattering in Two-Pion Decay of Heavy Quarkonia
The role of pion rescattering in ππ decay of radially excited heavy quarkonia modeled in terms of a Qππ coupling, is investigated within the framework of the covariant Blankenbecler-Sugar equation. The effects of pion rescattering (or pion exchange) are shown to be large, unless the coupling of the two-pion system to the heavy quarks is mediated by a fairly light scalar σ meson, which couples t...
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ژورنال
عنوان ژورنال: Il Nuovo Cimento
سال: 1960
ISSN: 0029-6341,1827-6121
DOI: 10.1007/bf02859747