Results 31 to 40 of about 221,719 (219)
THEORETICAL ASPECTS OF THE PION-PION INTERACTION [PDF]
International Journal of Modern Physics A, 2006 We give a brief review of the theoretical description of low energy pion-pion scattering by the combined use of Chiral Perturbation Theory and Roy equations, an update of the Regge parametrization of ππ cross sections at high energies, and a short discussion of the scalar radius of the pion.
Caprini, Irinel +2 more
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Pion damping width from SU(2) x SU(2) NJL model
, 2003 Within the framework of the NJL model, we investigate the modification of the pion damping width in a hot pion gas for temperatures ranging from 0 to 180 MeV. The pion is found to broaden noticeably at T > 60 MeV. Near the chiral phase transition T ~ 180
B. Lenkeit +16 more
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Energy dependence of pion in-medium effects on \pi^-/\pi^+ ratio in heavy-ion collisions [PDF]
, 2013 Within the framework of a thermal model with its parameters fitted to the results from an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, we study the pion in-medium effect on the charged-pion ratio in heavy-ion collisions at ...
Chen, Lie-Wen +4 more
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Pion Production in Pion Nucleon Scattering and Pion-Pion Interaction [PDF]
Progress of Theoretical Physics, 1962 The reaction pi + N yields 2 pi + N is discussed. The production process is assumed to take place mainly via pi - pi interactions, which are studied using an extrapolation formula (G. F. Chew and F. E. Low, Phys. Rev., 113: 1640 (1959)). A program giving a consistent explanation to the process at 0.3 to 1.5 Bev is presented.
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Pion-pion scattering in two dimensions [PDF]
Physical Review D, 1999 Massive two-flavor QED_2 is known to have many similarities to the two-flavor QCD_4. Here we compare the - scattering amplitudes (actually an analog process in QED_2) of the two theories. The QED_2 amplitude is computed from the bosonized version of the model while the QCD_4 amplitude is computed from an effective low energy chiral Lagrangian.
Schechter, Joseph +2 more
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Information on the structure of the rho meson from the pion form-factor
, 2009 The electromagnetic pion form-factor is calculated in a Bethe-Salpeter approach which accounts for pion rescattering. In the scattering kernel the pion-pion contact interaction from lowest-order chiral perturbation theory is considered together with an ...
F. Klingl, S. Leupold
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Phase Transition in Hot Pion Matter [PDF]
, 2000 The equation of state for the pion gas is analyzed within the third virial approximation. The second virial coefficient is found from the pion-pion- scattering data, while the third one is considered as a free parameter.
A. Kostyuk +17 more
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Meson-baryon sigma terms in QCD Sum Rules
, 2007 We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent ...
Belyaev +45 more
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Nature, 1976 Pion-Pion Interactions in Particle Physics. By B. R. Martin, D. Morgan and G. Shaw. Pp. xi+460. (Academic: London and New York, May 1976.) £16; $40.50.
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Pion Superfluidity and Meson Properties at Finite Isospin Density
, 2009 We investigate pion superfluidity and its effect on meson properties and equation of state at finite temperature and isospin and baryon densities in the frame of standard flavor SU(2) NJL model.
A. B. Migdal +6 more
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