P-Wave Pion-Pion Interaction
نویسندگان
چکیده
منابع مشابه
Theoretical 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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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.
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We discuss medium modifications of the unitarized pion-pion interaction in the nuclear medium. We incorporate both the effects of chiral symmetry restoration and the influence of collective nuclear pionic modes originating from the p-wave coupling of the pion to delta-hole configurations. We show in particular that the dropping of the sigma meson mass significantly enhances the low energy struc...
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Production of p-wave pions in nucleon-nucleon collisions is studied according to an improved power counting that embodies the constraints of chiral symmetry. Contributions from the first two nonvanishing orders are calculated. We find reasonable convergence and agreement with data for a spin-triplet cross section in pp-->pppi(0), with no free parameters. Agreement with existing data for a spin-...
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1Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany 2Institute for Theoretical and Experimental Physics, 117218, B. Cheremushkinskaya 25, Moscow, Russia 3Helmholtz-Institut für Strahlenund Kernphysik (Theorie), Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany 4Institute for Advanced Simulati...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1960
ISSN: 0033-068X
DOI: 10.1143/ptp.24.840